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Upon first reading about it, Thomas Jefferson's house at Monticello–a structure he himself designed and that he filled with strange devices, such as a room-sized clock that partially disappears through the floor, and a collection of paleontological artifacts, including mastodon bones—sounds like something straight out of a science fiction novel.

Amidst this symmetrical house of complex moving walls and shelves, hidden servants' passages, and meteorological equipment, the early days of a nation destined to become the United States were given a speculative, scientific air, where the European Enlightenment met the giant, extinct species of the New World, and an unmapped landscape creased with unearthly rivers meandering always further outward through endless plains and distant mountains.

Described that way, Monticello sounds not unlike "Solomon’s House," a fabulous scientific research facility featured in Sir Francis Bacon’s 17th-century utopian science fiction tale, The New Atlantis.

The Invisible College or the House of Solomon, Teophilus Schweighardt,1618, via.

Solomon’s House, we read, is a kind of super-observatory, a temple of science inside of which natural philosophers manage vast, artificial landscapes and operate complex machines, in spatial scenarios that rival anything we might read about today in Dubai or China.

Bacon offers a lengthy inventory of the devices available for use there: "We have... great and spacious houses where we imitate and demonstrate meteors... We have also sound-houses, where we practice and demonstrate all sounds, and their generation... We have also engine-houses, where are prepared engines and instruments for all sorts of motions... We have also a mathematical house, where are represented all instruments, as well of geometry as astronomy, exquisitely made..."

Thus, hoping to encounter a kind of Solomon's House of the early Americas, built by a U.S. President, its walls filled with mysterious devices and its rooms lined with old bones and fossils, with maps of unknown frontier lands greeting every visitor in the entrance hall, Venue went out of its way to visit Monticello, on the edge of Charlottesville, Virginia.

Alas, in reality, Jefferson's house is interesting, but by no means the steampunk-like fantasy of para-scientific insights, moving walls, and secret passages that at least one half of Venue was giddily—naively?—anticipating.

As it was, Venue arrived in a foggy downpour after a long drive across the state, arriving just in time for the final tour of the day, on which we were the only people.

The start of Jefferson's 7-Day Clock, in the entrance hall of Monticello. Photo courtesy Thomas Jefferson Foundation.

The clock continues through the floor.

This wind direction indicator is connected to a weathervane on the roof.

A revolving service door. Photo courtesy Thomas Jefferson Foundation.

Of course, Monticello does, indeed, have the famous clock that stretches down from the foyer all the way into the cellar, where the passage of time is marked by painted lines on the structure of the house itself; and there is the garden outside with its mysterious lost roads.

But there is also the mundane reality of a house stocked with old furniture and fancy porcelain, and the understated historical fact that it's, in fact, deeply misleading to refer to anything here as a servant's passage, when it is now so widely known as to be satirized in pop culture that Thomas Jefferson was a slave-owner and the people walking around through hidden doors and tight corridors from room to room, remaining out of sight whenever possible, weren't employees but human possessions.

The lower jawbone of a mastodon, displayed at Monticello. Photo courtesy Thomas Jefferson Foundation.

In the end, there were the old bones, maps, and artifacts from the expedition of Lewis & Clark; but we did not spend nearly as much time there as we thought we might, and instead continued, while the rain continued to fall, on our way north to Washington D.C.
A landscape painting above Penny Boston's living room entryway depicts astronauts exploring Mars.

Penelope Boston is a speleo-biologist at New Mexico Tech, where she is Director of Cave and Karst Science. She graciously welcomed Venue to her home in Los Lunas, New Mexico, where we arrived with design futurist Stuart Candy in tow, en route to dropping him off at the Very Large Array later that same afternoon.

Boston's work involves studying subterranean ecosystems and their extremophile inhabitants here on Earth, in order to better imagine what sorts of environments and lifeforms we might encounter elsewhere in the Universe. She has worked with the NASA Innovative Advanced Concepts program (NIAC) to develop protocols for both human extraterrestrial cave habitation, and for subterranean life-detection missions on Mars, which she believes is highly likely to exist.

Over the course of the afternoon, Boston told Venue about her own experiences on Mars analog sites; she explained why she believes there is a strong possibility for life below the surface of the Red Planet, perhaps inside the planet's billion year-old networks of lava tubes; she described her astonishing (and terrifying) cave explorations here on Earth; and we touch on some mind-blowing ideas seemingly straight out of science fiction, including extreme forms of extraterrestrial life (such as dormant life on comets, thawed and reawakened with every passage close to the sun) and the extraordinary potential for developing new pharmaceuticals from cave microorganisms. The edited transcript of our conversation is below.

• • •

The Flashline Mars Arctic Research Station (FMARS) on Devon Island, courtesy the Mars Society.

Geoff Manaugh: As a graduate student, you co-founded the Mars Underground and then the Mars Society. You’re a past President of the Association of Mars Explorers, and you’re also now a member of the science team taking part in Mars Arctic 365, a new one-year Mars surface simulation mission set to start in summer 2014 on Devon Island. How does this long-term interest in Mars exploration tie into your Earth-based research in speleobiology and subterranean microbial ecosystems?

Penelope Boston: Even though I do study surface things that have a microbial component, like desert varnish and travertines and so forth, I really think that it’s the subsurface of Mars where the greatest chance of extant life, or even preservation of extinct life, would be found.

Nicola Twilley: Is it part of NASA’s strategy to go subsurface at any point, to explore caves on Mars or the moon?

Boston: Well, yes and no. The “Strategy” and the strategy are two different things.

The Mars Curiosity rover is a very capable chemistry and physics machine and I am, of course, dying to hear the details of the geochemistry it samples. A friend of mine, for instance, with whom I’m also a collaborator, is the principal investigator of the SAM instrument. Friends of mine are also on the CheMin instrument. So I have a vested interest, both professionally and personally, in the Curiosity mission.

On the other hand, you know: here we go again with yet another mission on the surface. It’s fascinating, and we still have a lot to learn there, but I hope I will live long enough to see us do subsurface missions on Mars and even on other bodies in the solar system.

Unfortunately, right now, we are sort of in limbo. The downturn in the global economy and our national economy has essentially kicked NASA in the head. It’s very unclear where we are going, at this point. This is having profound, negative effects on the Agency itself and everyone associated with it, including those of us who are external fundees and sort of circum-NASA.

On the other hand, although we don’t have a clear plan, we do have clear interests, and we have been pursuing preliminary studies. NASA has sponsored a number of studies on deep drilling, for example. One of the most famous was probably about 15 years ago, and it really kicked things off. That was up in Santa Fe, and we were looking at different methodologies for getting into the subsurface.

I have done a lot of work, some of which has been NASA-funded, on the whole issue of lava tubes—that is, caves associated with volcanism on the surface. Now, Glenn Cushing and Tim Titus at the USGS facility in Flagstaff have done quite a bit of serious work on the high-res images coming back from Mars, and they have identified lava tubes much more clearly than we ever did in our earlier work over the past decade.

Surface features created by lava tubes on Mars; image via ESA

Twilley: Are caves as common on Mars as they are on Earth? Is that the expectation?

Boston: I’d say that lava tubes are large, prominent, and liberally distributed everywhere on Mars. I would guess that there are probably more lava tubes on Mars than there are here on Earth—because here they get destroyed. We have such a geologically and hydro-dynamically active planet that the weathering rates here are enormous.

But on Mars we have a lot of factors that push in the other direction. I’d expect to find tubes of exceeding antiquity—I suspect that billions-of-year-old tubes are quite liberally sprinkled over the planet. That’s because the tectonic regime on Mars is quiescent. There is probably low-level tectonism—there are, undoubtedly, Marsquakes and things like that—but it’s not a rock’n’roll plate tectonics like ours, with continents galloping all over the place, and giant oceans opening up across the planet.

That means the forces that break down lava tubes are probably at least an order of magnitude or more—maybe two, maybe three—less likely to destroy lava tubes over geological time. You will have a lot of caves on Mars, and a lot of those caves will be very old.

Plus, remember that you also have .38 G. The intrinsic tensile strength of the lava itself, or whatever the bedrock is, is also going to allow those tubes to be much more resistant to the weaker gravity there.

Surface features of lava tubes on Mars; image via ESA

Manaugh: I’d imagine that, because the gravity is so much lower, the rocks might also behave differently, forming different types of arches, domes, and other formations underground. For instance, large spans and open spaces would be shaped according to different gravitational strains. Would that be a fair expectation?

Boston: Well, it’s harder to speculate on that because we don’t know what the exact composition of the lava is—which is why, someday, we would love to get a Mars sample-return mission, which is no longer on the books right now. [sighs] It’s been pushed off.

In fact, I just finished, for the seventh time in my career, working on a panel on that whole issue. This was the E2E—or End-to-End—group convened by Dave Beatty, who is head of the Mars Program at the Jet Propulsion Laboratory [PDF].

About a year ago, we finished doing some intensive international work with our European Space Agency partners on Mars sample-return—but now it’s all been pushed off again. The first one of those that I worked on was when I was an undergraduate, almost ready to graduate at Boulder, and that was 1979. It just keeps getting pushed off.

I’d say that we are very frustrated within the planetary and astrobiology communities. We can use all these wonderful instruments that we load onto vehicles like Curiosity and we can send them there. We can do all this fabulous orbital stuff. But, frankly speaking, as a person with at least one foot in Earth science, until you’ve got the stuff in your hands—actual physical samples returned from Mars—there is a lot you can’t do.

Looking down through a "skylight" on Mars; image via NASA/JPL/University of Arizona

Image via NASA/JPL/University of Arizona

Twilley: Could you talk a bit about your work with exoplanetary research, including what you’re looking for and how you might find it?

Boston: [laughs] The two big questions!

But, yes. We are working on a project at Socorro now to atmospherically characterize exoplanets. It’s called NESSI, the New Mexico Exoplanet Spectroscopic Survey Instrument. Our partner is Mark Swain, over at JPL. They are doing it using things like Kepler, and they have a new mission they’re proposing, called FINESSE. FINESSE will be a dedicated exoplanet atmospheric characterizer.

We are also trying to do that, in conjunction with them, but from a ground-based instrument, in order to make it more publicly accessible to students and even to amateur astronomers.

That reminds me—one of the other people you might be interested in talking to is a young woman named Lisa Messeri, who just recently finished her PhD in Anthropology at MIT. She’s at the University of Pennsylvania now. Her focus is on how scientists like me to think about other planets as other worlds, rather than as mere scientific targets—how we bring an abstract scientific goal into the familiar mental space where we also have recognizable concepts of landscape.

I’ve been obsessed with that my entire life: the concept of space, and the human scaling of these vastly scaled phenomena, is central, I think, to my emotional core, not just the intellectual core.

The Allan Hills Meteorite (ALH84001); courtesy of NASA.

Manaugh: While we’re on the topic of scale, I’m curious about the idea of astrobiological life inhabiting a radically, undetectably nonhuman scale. For example, one of the things you’ve written and lectured about is the incredible slowness it takes for some organisms to form, metabolize, and articulate themselves in the underground environments you study. Could there be forms of astrobiological life that exist on an unbelievably different timescale, whether it’s a billion-year hibernation cycle that we might discover at just the wrong time and mistake, say, for a mineral? Or might we find something on a very different spatial scale—for example, a species that is more like a network, like an aspen tree or a fungus?

Boston: You know, Paul Davies is very interested in this idea—the concept of a shadow biosphere. Of course, I had also thought about this question for many years, long before I read about Davies or before he gave it a name.

The conundrum you face is how you would know—how you would study or even conceptualize—these other biospheres? It’s outside of your normal spatial and temporal comfort zone, in which all of your training and experience has guided you to look, and inside of which all of your instruments are designed to function. If it’s outside all of that, how will you know it when you see it?

Imagine comets. With every perihelion passage, volatile gases escape. You are whipping around the solar system. Your body comes to life for that brief period of time only. Now apply that to icy bodies in very elliptical orbits in other solar systems, hosting life with very long periods of dormancy.

There are actually some wonderful early episodes of The Twilight Zone that tap into that theme, in a very poetic and literary way. [laughs] Of course, it’s also the central idea of some of the earliest science fiction; I suppose Gulliver’s Travels is probably the earliest exploration of that concept.

In the microbial realm—to stick with what we do know, and what we can study—we are already dealing with itsy-bitsy, teeny-weeny things that are devilishly difficult to understand. We have a lot of tools now that enable us to approach those, but, very regularly, we’ll see things in electron microscopy that we simply can’t identify and they are very clearly structured. And I don’t think that they are all artifacts of the preparation—things that get put there accidentally during prep.

A lot of the organisms that we actually grow, and with which we work, are clearly nanobacteria. I don’t know how familiar you are with that concept, but it has been extremely controversial. There are many artifacts out there that can mislead us, but we do regularly see organisms that are very small. So how small can they be—what’s the limit?

A few of the early attempts at figuring this out were just childish. That’s a mean thing to say, because a lot of my former mentors have written some of those papers, but they would say things like: “Well, we need to conduct X, Y, and Z metabolic pathways, so, of course, we need all this genetic machinery.” I mean, come on, you know that early cells weren’t like that! The early cells—who knows what they were or what they required?

To take the famous case of the ALH84001 meteorite: are all those little doobobs that you can see in the images actually critters? I don’t know. I think we’ll never know, at least until we go to Mars and bring back stuff.

I actually have relatively big microbes in my lab that regularly feature little knobs and bobs and little furry things, that I am actually convinced are probably either viruses or prions or something similar. I can’t get a virologist to tell me yes. They are used to looking at viruses that they can isolate in some fashion. I don’t know how to get these little knobby bobs off my guys for them to look at.

The Allan Hills Meteorite (ALH84001); courtesy of NASA.

Twilley: In your paper on the human utilization of subsurface extraterrestrial environments [PDF], you discuss the idea of a “Field Guide to Unknown Organisms,” and how to plan to find life when you don’t necessarily know what it looks like. What might go into such a guide?

Boston: The analogy I often use with graduate students when I teach astrobiology is that, in some ways, it’s as if we are scientists on a planet orbiting Alpha Centauri and we are trying to write a field guide to the birds of Earth. Where do you start? Well, you start with whatever template you have. Then you have to deeply analyze every feature of that template and ask whether each feature is really necessary and which are just a happenstance of what can occur.

I think there are fundamental principles. You can’t beat thermodynamics. The need for input and outgoing energy is critical. You have to be delicately poised, so that the chemistry is active enough to produce something that would be a life-like process, but not so active that it outstrips any ability to have cohesion, to actually keep the life process together. Water is great as a solvent for that. It’s probably not the only solvent, but it’s a good one. So you can look for water—but do you really need to look for water?

I think you have to pick apart the fundamental assumptions. I suspect that predation is a relatively universal process. I suspect that parasitism is a universal process. I think that, with the mathematical work being done on complex, evolving systems, you see all these emerging properties.

Now, with all of that said, the details—the sizes, the scale, the pace, getting back to what we were just talking about—I think there is huge variability in there.

Seven caves on Mars; images courtesy of NASA/JPL-Caltech/ASU/USGS.

Twilley: How do you train people to look for unrecognizable life?

Boston: I think everybody—all biologists—should take astrobiology. It would smack you on the side of the head and say, “You have to rethink some of these fundamental assumptions! You can’t just coast on them.”

The organisms that we study in the subsurface are so different from the microbes that we have on the surface. They don’t have any predators—so, ecologically, they don’t have to outgrow any predators—and they live in an environment where energy is exceedingly scarce. In that context, why would you bother having a metabolic rate that is as high as some of your compatriots on the surface? You can afford to just hang out for a really long time.

We have recently isolated a lot of strains from these fluid inclusions in the Naica caves—the one with those gigantic crystals. It’s pretty clear that these guys have been trapped in these bubbles between 10,000 and 15,000 years. We’ve got fluid inclusions in even older materials—in materials that are a few million years old, even, in a case we just got some dates for, as much as 40 million years.

Naica Caves, image from the official website. The caves are so hot that explorers have to wear special ice-jackets to survive.

There are a lot of caveats on this planet. One of the caveats is, of course, that when you go down some distance, the overlying lithostatic pressure of all of that rock makes space not possible. Microbes can’t live in zero space. Further, they have to have at least inter-grain spaces or microporosity—there has to be some kind of interconnectivity. If you have organisms completely trapped in tiny pockets, and they never interact, then that doesn’t constitute a biosphere. At some point, you also reach temperatures that are incompatible with life, because of the geothermal gradient. Where exactly that spot is, I don’t know, but I’m actually working on a lot of theoretical ideas to do with that.

In fact, I’m starting a book for MIT Press that will explore some of these ideas. They wanted me to write a book on the cool, weird, difficult, dangerous places I go to and the cool, weird, difficult bugs I find. That’s fine—I’m going to do that. But, really, what I want to do is put what we have been working on for the last thirty years into a theoretical context that doesn’t just apply to Earth but can apply broadly, not only to other planets in our solar system, but to one my other great passions, of course, which is exoplanets—planets outside the solar system.

One of the central questions that I want to explore further in my book, and that I have been writing and talking about a lot, is: what is the long-term geological persistence of organisms and geological materials? I think this is another long-term, evolutionary repository for living organisms—not just fossils—that we have not tapped into before. I think that life gets recycled over significant geological periods of time, even on Earth.

That’s a powerful concept, if we then apply it to somewhere like Mars, for example, because Mars does these obliquity swings. It has super-seasonal cycles, because it has these little dimple moons that don’t stabilize it, whereas our moon stabilizes the Earth’s obliquity level. That means that Mars is going through these super cold and dry periods of time, followed by periods of time where it’s probably more clement.

Now, clearly, if organisms can persist for tens of thousands of years—let alone hundreds of thousands of years, and possibly even millions of years—then maybe they are reawakenable. Maybe you have this very different biosphere.

Manaugh: It’s like a biosphere in waiting.

Boston: Yes—a biosphere in waiting, at a much lower level.

Recently, I have started writing a conceptual paper that really tries to explore those ideas. The genome that we see active on the surface of any planet might be of two types. If you have a planet like Earth, which is photosynthetically driven, you’re going to have a planet that is much more biological in terms of the total amount of biomass and the rates at which this can be produced. But that might not be the only way to run a biosphere.

You might also have a much more low-key biosphere that could actually be driven by geochemical and thermal energy from the inside of the planet. This was the model that we—myself, Chris McKay, and Michael Ivanoff, one of our colleagues from what was the Soviet Union at the time—published more than twenty years ago for Mars. We suggested that there would be chemically reduced gases coming from the interior of the planet.

That 1992 paper was what got us started on caves. I had never been in a wild cave in my life before. We were looking for a way to get into that subsurface space. The Department of Energy was supporting a few investigators, but they weren’t about to share their resources. Drilling is expensive. But caves are just there; you can go inside them.

So that’s really what got us into caving. It was at that point where I discovered caves are so variable and fascinating, and I really refocused my career on that for the last 20 years.

Lechuguilla Cave, photograph by Dave Bunnell.

Penelope Boston caving, image courtesy of V. Hildreth-Werker, from "Extraterrestrial Caves: Science, Habitat, Resources," NIAC Phase I Study Final Report, 2001.

The first time I did any serious caving was actually in Lechuguilla Cave. It was completely nuts to make that one’s first wild cave. We trained for about three hours, then we launched into a five-day expedition into Lechuguilla that nearly killed us! Chris McKay came out with a terrible infection. I had a blob of gypsum in my eye and an infection that swelled it shut. I twisted my ankle. I popped a rib. Larry Lemke had a massive migraine. We were not prepared for this. The people taking us in should have known better. But one of them is a USGS guide and a super caving jock, so it didn’t even occur to him—it didn’t occur to him that we were learning instantaneously to operate in a completely alien landscape with totally inadequate skills.

All I knew was that I was beaten to a pulp. I could almost not get across these chasms. I’m a short person. Everybody else was six feet tall. I felt like I was just hanging on long enough so I could get out and live. I've been in jams before, including in Antarctica, but that’s all I thought of the whole five days: I just have to live through this.

But, when I got out, I realized that what the other part of my brain had retained was everything I had seen. The bruises faded. My eye stopped being infected. In fact, I got the infection from looking up at the ceiling and having some of those gooey blobs drip down into my eye—but, I was like, “Oh my God. This is biological. I just know it is.” So it was a clue. And, when, I got out, I knew I had to learn how to do this. I wanted to get back in there.

ESA astronauts on a "cave spacewalk" during a 2011 training mission in the caves of Sardinia; image courtesy of the ESA.

Manaugh: You have spoken about the possibility of entire new types of caves that are not possible on Earth but might be present elsewhere. What are some of these other cave types you think might exist, and what sort of conditions would have formed them? You’ve used some great phrases to describe those processes—things like “volatile labyrinths” and “ice volcanism” that create speleo-landscapes that aren’t possible on Earth.

Boston: Well, in terms of ice, I’ll bet there are all sorts of Lake Vostok-like things out there on other moons and planets. The thing with Lake Vostok is that it’s not a lake. It’s a cave. It’s a cave in ice. The ice, in this case, acts as bedrock, so it’s not a “lake” at all. It’s a closed system.

Manaugh: It’s more like a blister: an enclosed space full of fluid.

Boston: Exactly. In terms of speculating on the kinds of caves that might exist elsewhere in the universe, we are actually working on a special issue for the Journal of Astrobiology right now, based on the extraterrestrial planetary caves meeting that we did last October. We brought people from all over the place. This is a collaboration between my Institute—the National Cave and Karst Research Institute in Carlsbad, where we have our headquarters—and the Lunar and Planetary Institute.

The meeting was an attempt to explore these ideas. Karl Mitchell from JPL, who I had not met previously, works on Titan; he’s on the Cassini Huygens mission. He thinks he is seeing karst-like features on Titan. Just imagine that! Hydrocarbon fluids producing karst-like features in water-ice bedrock—what could be more exotic than that?

That also shows that the planetary physics dominates in creating these environments. I used to think that the chemistry dominated. I don’t think so anymore. I think that the physics dominates. You have to step away from the chemistry at first and ask: what are the fundamental physics that govern the system? Then you can ask: what are the fundamental chemical potentials that govern the system that could produce life? It’s the same exercise with imagining what kind of caves you can get—and I have a lurid imagination.

From "Human Utilization of Subsurface Extraterrestrial Environments," P. J. Boston, R. D. Frederick, S. M. Welch, J. Werker, T. R. Meyer, B. Sprungman, V. Hildreth-Werker, S. L. Thompson, and D. L. Murphy, Gravitational and Space Biology Bulletin 16(2), June 2003.

One of the fun things I do in my astrobiology class every couple of years is the capstone project. The students break down into groups of four or five, hopefully well-mixed in terms of biologists, engineers, chemists, geologists, physicists, and other backgrounds. They have to design their own solar system, including the fundamental, broad-scale properties of its star. They have to invent a bunch of planets to go around it. And they have to inhabit at least one of those planets with some form of life. Then they have to design a mission—either telescopic or landed—that could study it. They work on this all semester, and they are so creative. It’s wonderful. There is so much value in imagining the biospheres of other planetary bodies.

You just have to think: “What are the governing equations that you have on this planet or in this system?” You look at the gravitational value of a particular body, its temperature regime, and the dominant geochemistry. Does it have an atmosphere? Is it tectonic? One of the very first papers I did—it appeared in one of these obscure NASA special publications, of which they print about 100 and nobody can ever find a copy—was called “Bubbles in the Rocks.” It was entirely devoted to speculation about the properties of natural and artificial caves as life-support structures. A few years later, I published a little encyclopedia article, expanding on it, and I’m now working on another expansion, actually.

I think that, either internally, externally, or both, planetary bodies that form cracks are great places to start. If you then have some sort of fluid—even episodically—within that system, then you have a whole new set of cave-forming processes. Then, if you have a material that can exist not only in a solid phase, but also as a liquid or, in some cases, even in a vapor phase on the same planetary body, then you have two more sets of potential cave-forming processes. You just pick it apart from those fundamentals, and keep building things up as you think about these other cave-forming systems and landscapes.

ESA astronauts practice "cakewalking"; image courtesy ESA-V. Corbu.

Manaugh: One of my favorite quotations of all time—and I'll probably get it wrong now that I’ve said that—is from a William S. Burroughs novel, where he describes what he calls “a vast mineral consciousness at absolute zero, thinking in slow formations of crystal.”

Boston: Oh, wow.

Manaugh: I mention that because I’m curious about how the search for “extraterrestrial life” always tends to be terrestrial, in the sense that it’s geological and it involves solid planetary formations. But what about the search for life on a gaseous planet—would life be utterly different there, chemically speaking, or would it simply be sort of dispersed, or even aerosolized? I suppose I’m also curious if there could be a “cave” on a gaseous planet and, if so, would it really just be a weather system? Is a “cave” on a gaseous planet actually a storm? Or, to put it more abstractly, can there be caves without geology?

Boston: Hmm. Yes, I think there could be. If it was enclosed or self-perpetuating.

Manaugh: Like a self-perpetuating thermal condition in the sky. It would be a sort of atmospheric “cave.”

Twilley: It would be a bubble.

ESA astronauts explore caves in Sardinia; image courtesy ESA–R. Bresnik.

Boston: In terms of life that could exist in a permanent, fluid medium that was gaseous—rather than a compressed fluid, like water—Carl Sagan and Edwin Salpeter made an attempt at that, back in 1975. In fact, I use their "Jovian Gasbags" paper as a foundational text in my astrobiology classes.

But an atmospheric system like Jupiter is dominated—just like an ocean is—by currents. It’s driven by thermal convection cells, which are the weather system, but it’s at a density that gives it more in common with our oceans than with our sky. And we are already familiar with the fact that our oceans, even though they are a big blob of water, are spatially organized into currents, and they are controlled by density, temperature, and salinity. The ocean has a massively complex three-dimensional structure; so, too, does the Jovian atmosphere. So a gas giant is really more like a gaseous ocean I think.

Now, the interior machinations that go on in inside a planet like Jupiter are driving these gas motions. There is a direct analogy here to the fact that, on our rocky terrestrial planet, which we think of as a solid Earth, the truth is that the mantle is plastic—in fact, the Earth’s lower crust is a very different substance from what we experience up here on this crusty, crunchy top, this thing that we consider solid geology. Whether we’re talking about a gas giant like Jupiter or the mantle of a rocky planet like Earth, we are really just dealing with different regimes of density—and, here again, it’s driven by the physics.

ESA astronauts set up an experimental wind-speed monitoring station in the caves of Sardinia; image courtesy ESA/V. Crobu.

A couple of years ago, I sat in on a tectonics class that one of my colleagues at New Mexico Tech was giving, which was a lot of fun for me Everybody else was thinking about Earth, and I was thinking about everything but Earth. For my little presentation in class, what I tried to do was think about analogies to things on icy bodies—to look at Europa, Titan, Enceledus, Ganymede, and so forth, and to see how they are being driven by the same tectonic processes, and even producing the same kind of brittle-to-ductile mantle transition, but in ice rather than rock.

I think that, as we go further and further in the direction of having to explain what we think is going on in exoplanets, it’s going to push some of the geophysics in that direction, as well. There is amazingly little out there. I was stunned, because I know a lot of planetary scientists who are thinking about this kind of stuff, but there is a big gulf between Earth geophysics and applying those lessons to exoplanets.

ESA astronauts prepare for their 2013 training mission in the caves of Sardinia; image courtesy ESA-V. Crobu.

Manaugh: We need classes in speculative geophysics.

Boston: Yeah—come on, geophysicists! [laughs] Why shouldn’t they get in the game? We’ve been doing it in astrobiology for a long time.

In fact, when I’ve asked my colleagues certain questions like, “Would we even get orogeny on a three Earth-mass planet?” They are like, “Um… We don’t know.” But you know what? I bet we have the equations to figure that out.

It starts with something as simple as that: in different or more extreme gravitational regimes, could you have mountains? Could you have caves? How could you calculate that? I don’t know the answer to that—but you have to ask it.

ESA astronauts take microbiological samples during a 2011 training mission in the caves of Sardinia; image courtesy of the ESA.

Twilley: You’re a member of NASA’s Planetary Protection Subcommittee. Could you talk a little about what that means. I’m curious whether the same sorts of planetary protection protocols we might use on other planets like Mars should also be applied to the Earth’s subsurface. How do we protect these deeper ecosystems? And how do we protect deeper ecosystems on Mars, if there are any?

Boston: That’s a great question. We are working extremely hard to do that, actually.

Planetary protection is the idea that we must protect Earth from off-world contaminants. And, of course, vice versa: we don’t want to contaminate other planets, both for scientific reasons and, at least in my case, for ethical reasons, with biological material from Earth.

In other words, I think we owe it to our fellow bodies in the solar system to give them a chance to prove their biogenicity or not, before humans start casually shedding our skin cells or transporting microbes there.

That’s planetary protection, and it works both ways.

One thing I have used as a sales pitch in some of my proposals is the idea that we are attempting to become more and more noninvasive in our cave exploration, which is very hard to do. For example, we have pushed all of our methods in the direction of using miniscule quantities of sample. Most Earth scientists can just go out and collect huge chunks of rock. Most biologists do that, too. You grow E. coli in the lab and you harvest tons of it. But I have to take just a couple grams of material—on a lucky day—sometimes even just milligrams of material, with very sparse bio density in there. I have to work with that.

What this means is that the work we are doing also lends itself really well to developing methods that would be useful on extraterrestrial missions.

In fact, we are pushing in the direction of not sampling at all, if we can. We are trying to see what we can learn about something before we even poke it. So, in our terrestrial caving work, we are actually living the planetary protection protocol.

We are also working in tremendously sensitive wilderness areas and we are often privileged enough to be the only people to get in there. We want to minimize the potential contamination.

That said, of course, we are contaminant sources. We risk changing the environment we’re trying to study. We struggle with this. I struggle with it physically and methodologically. I struggle with it ethically. You don’t want to screw up your science and inadvertently test your own skin bugs.

I’d say this is one of those cases where it’s not unacceptable to have a nonzero risk—to use a double negative again. There are few things in life that I would say that about. Even in our ridiculous risk-averse culture, we understand that for most things, there is a nonzero risk of basically anything. There is a nonzero risk that we’ll be hit by a meteorite now, before we are even done with this interview. But it’s pretty unlikely.

In this case, I think it’s completely unacceptable to run much of a risk at all.

That said, the truth is that pathogens co-evolve with their hosts. Pathogenesis is a very delicately poised ecological relationship, much more so than predation. If you are made out of the same biochemistry I’m made of, the chances are good that I can probably eat you, assuming that I have the capability of doing that. But the chances that I, as a pathogen, could infect you are miniscule. So there are different degrees of danger.

There is also the alien effect, which is well known in microbiology. That is that there is a certain dose of microbes that you typically need to get in order for them to take hold, because they are coming into an area where there’s not much ecological space. They either have to be highly pre-adapted for whatever the environment is that they land in, or they have to be sufficiently numerous so that, when they do get introduced, they can actually get a toehold.

We don’t really understand some of the fine points of how that occurs. Maybe it’s quorum sensing. Maybe it’s because organisms don’t really exist as single strains at the microbial level and they really have to be in consortia—in communities—to take care of all of the functions of the whole community.

We have a very skewed view of microbiology, because our knowledge comes from a medical and pathogenesis history, where we focus on single strains. But nobody lives like that. There are no organisms that do that. The complexity of the communal nature of microorganisms may be responsible for the alien effect.

So, given all of that, do I think that we are likely to be able to contaminate Mars? Honestly, no. On the surface, no. Do I act as if we can? Yes—absolutely, because the stakes are too high.

Now, do I think we could contaminate the subsurface? Yes. You are out of the high ultraviolet light and out of the ionizing radiation zone. You would be in an environment much more likely to have liquid water, and much more likely to be in a thermal regime that was compatible with Earth life.

So you also have to ask what part of Mars you are worried about contaminating.

ESA teams perform bacterial sampling and examine a freshwater supply; top photo courtesy ESA–V. Crobu; bottom courtesy ESA/T. Peake.

Manaugh: There’s been some interesting research into the possibility of developing new pharmaceuticals from these subterranean biospheres—or even developing new industrial materials, like new adhesives. I’d love to know more about your research into speleo-pharmacology or speleo-antibiotics—drugs developed from underground microbes.

Boston: It’s just waiting to be exploited. The reasons that it has not yet been done have nothing to do with science and nothing to do with the tremendous potential of these ecosystems, and everything to do with the bizarre and not very healthy economics of the global drug industry. In fact, I just heard that someone I know is leaving the pharmaceutical industry, because he can’t stand it anymore, and he’s actually going in the direction of astrobiology.

Really, there is a de-emphasis on drug discovery today and more of an emphasis on drug packaging. It is entirely profit-driven motive, which is distasteful, I think, and extremely sad. I see a real niche here for someone who doesn’t want to become just a cog in a giant pharmaceutical company, someone who wants to do a small start-up and actually do drug discovery in an environment that is astonishingly promising.

It’s not my bag; I don’t want to develop drugs. But I see our organisms producing antibiotics all the time. When we grow them in culture, I can see where some of them are oozing stuff—pink stuff and yellow stuff and clear stuff. And you can see it in nature. If you go to a lava tube cave, here in New Mexico, you see they are doing it all the time.

A lot of these chemistry tests screen for mutagenic activity, chemogenic activity, and all of the other things that are indications of cancer-fighting drugs and so on, and we have orders of magnitude more hits from cave stuff than we do from soils. So where is everybody looking? In soils. Dudes! I’ve got whole ecosystems in one pool that are different from an ecosystem in another pool that are less than a hundred feet apart in Lechuguilla Cave! The variability—the non-homogeneity of the subsurface—vastly exceeds the surface, because it’s not well mixed.

ESA astronauts prepare their experiments and gear for a 2013 CAVES ("Cooperative Adventure for Valuing and Exercising human behaviour and performance Skills") mission in Sardinia; image courtesy ESA–V. Crobu

Twilley: In your TED talk, you actually say that the biodiversity in caves on Earth may well exceed the entire terrestrial biosphere.

Boston: Oh, yes—certainly the subsurface. There is a heck of a lot of real estate down there, when you add all those rock-fracture surface areas up. And each one of these little pockets is going off on its own evolutionary track. So the total diversity scales with that. It’s astonishing to me that speleo-bioprospecting hasn’t taken off already. I keep writing about it, because I can’t believe that there aren’t twenty-somethings out there who don’t want to go work for big pharma, who are fascinated by this potential for human use.

There is a young faculty member at the University of New Mexico in Albuquerque, whose graduate student is one of our friends and cavers, and they are starting to look at some of these. I’m like, “Go for it! I can supply you with endless cultures.”

Twilley: In your “Human Mission to Inner Space” experiment, you trialed several possible Martian cave habitat technologies in a one-week mission to a closed cave with a poisonous atmosphere in Arizona. As part of that, you looked into Martian agriculture, and grew what you called “flat crops.” What were they?

Boston: We grew great duckweed and waterfern. We made duckweed cookies. Gus made a rice and duckweed dish. It was quite tasty. [laughs] We actually fed two mice on it exclusively for a trial period, but although duckweed has more protein than soybeans, there weren’t enough carbohydrates to sustain them calorically.

But the duckweed idea was really just to prove a point. A great deal of NASA’s agricultural research has been devoted to trying to grow things for astronauts to make them happier on the long, outbound trips—which is very important. It is a very alien environment and I think people underestimate that. People who have not been in really difficult field circumstances have no apparent understanding of the profound impact of habitat on the human psyche and our ability to perform. Those of us who have lived in mock Mars habitats, or who have gone into places like caves, or even just people who have traveled a lot, outside of their comfort zone, know that. Your circumstances affect you.

One of the things we designed, for example, was a way to illuminate an interior subsurface space by projecting a light through fluid systems—because you’d do two things. You’d get photosynthetic activity of these crops, but you’d also get a significant amount of very soothing light into the interior space.

We had such a fabulous time doing that project. We just ran with the idea of: what you can do to make the space that a planet has provided for you into actual, livable space.

From Boston's presentation report on the Human Utilization of Subsurface Extraterrestrial Environments, NIAC Phase II study (PDF).

Twilley: Earlier on our Venue travels, we actually drove through Hanksville, Utah, where many of the Mars analog environment studies are done.

Boston: I’ve actually done two crews there. It’s incredibly effective, considering how low-fidelity it is.

Twilley: What makes it so effective?

Boston: Simple things are the most critical. The fact that you have to don a spacesuit and the incredible cumbersomeness of that—how it restricts your physical space in everything from how you turn your head to how your visual field is limited. Turning your head doesn’t work anymore, because you just look inside your helmet; your whole body has to turn, and it can feel very claustrophobic.

Then there are the gloves, where you’ve got your astronaut gloves on and you’re trying to manipulate the external environment without your normal dexterity. And there’s the cumbersomeness and, really, the psychological burden of having to simulate going through an airlock cycle. It’s tremendously effective. Being constrained with the same group of people, it is surprisingly easy to buy into the simulation. It’s not as if you don’t know you’re not on Mars, but it doesn’t take much to make a convincing simulation if you get those details right.

The Mars Desert Research Station, Hanksville, Utah; image courtesy of bandgirl807/Wikipedia.

I guess that’s what was really surprising to me, the first time I did it: how little it took to be transform your human experience and to really cause you to rethink what you have to do. Because everything is a gigantic pain in the butt. Everything you know is wrong. Everything you think in advance that you can cope with fails in the field. It is a humbling experience, and an antidote to hubris. I would like to take every engineer I know that works on space stuff—

Twilley: —and put them in Hanksville! [laughter]

Boston: Yes—seriously! I have sort of done that, by taking these loafer-wearing engineers—most of whom are not outdoorsy people in any way, who haunt the halls of MIT and have absorbed the universe as a built environment—out to something as simple as the lava tubes. I could not believe how hard it was for them. Lava tubes are not exactly rigorous caving. Most of these are walk-in, with only a little bit of scrambling, but you would have thought we’d just landed on Mars. It was amazing for some of them, how totally urban they are and how little experience they have of coping with a natural space. I was amazed.

I actually took a journalist out to a lava tube one time. I think this lady had never left her house before! There’s a little bit of a rigorous walk over lava—but it was as if she had never walked on anything that was not flat before.

From Venue's own visit to a lava tube outside Flagstaff, AZ.

It’s just amazing what one’s human experience does. This is why I think engineers should be forced to go out into nature and see if the systems they are designing can actually work. It’s one of the best ways for them to challenge their assumptions, and even to change the types of questions they might be asking in the first place.

In what would turn out to be, in retrospect, the northernmost stop on the 16-month Venue itinerary, we drove into the iron ranges and boreal forests of Minnesota to see a 6,000-ton machine buried inside the earth.

The Soudan Underground Mine State Park offers two ticketed tours, each very worthwhile, and we took both of them.

One tour offers a look back at the mine's history, descending 2,300 feet below the surface of the earth to explore the old drifts and stopes. Soudan was Minnesota's oldest and richest mine until U.S. Steel ceased operations in 1963, and the iron extracted here fueled East Coast steel mills, where it was transformed into the nation's railways, machinery, bridges, and weaponry.

The tour begins with a disconcertingly cold, and extraordinarily loud elevator ride shuddering deep into the artificial caverns of this now-derelict site. The ride down is itself spectacular, an all-encompassing roar of noise and darkness, occasionally broken by the film-strip like regular appearance of voids that, we learned, were the entrances of other mine levels we were dropping past. Wondering what was on that level—or that level, or the next level, or this other one—as they flickered by in the gloom allowed the full, nearly overwhelming size of the mine to sink in.

While the historic tour lacks the hokey, interpretive dimension of many other such mine tours, the genuinely hive-like nature of the Soudan Mine—a volumetrically incomprehensible human-carved labyrinth—is only loosely communicated. Only half-joking, we speculated that this might very well be to keep unprepared visitors from experiencing a kind of existential panic upon descent into the 50-plus miles of subterranean chambers.

What sets the Soudan Mine apart, though, is the gigantic high energy physics experiment buried in its bowels. On the accompanying "science tour," visitors have the chance to marvel at the three-story tall, 6,000-ton MINOS "far detector," a kind of catcher's mitt for subatomic particles called neutrinos.

More specifically, these are artificially generated neutrinos fired north from Fermilab outside Chicago. The neutrinos are produced by a complex series of subterranean graphite targets and vacuum pipes just outside Chicago, which transform a spray of protons from Fermilab's "Main Injector" particle accelerator into a focused beam of tiny neutrinos, traveling the 455 miles through the planet between their source and the detector in just 0.0025 seconds.

The neutrinos can make that journey without getting deflected or absorbed by layers of dense bedrock in between because they almost never interact with matter, zipping straight through earth, air, water, and, indeed, people, at a rate of 100 trillion per second, without leaving a single trace.

That same property, however, makes neutrinos extremely difficult to detect—they have been nicknamed the "ghost particle." Not altogether inaccurately compared to a huge camera, the MINOS detector is made from 485 iron plates studded with sensors, each of which is a buffer for slowing down and, in the end, capturing any neutrinos that spiraled through the room. With a trap rate of about one neutrino every two hours, MINOS is able to measure their oscillation speed, which, our guide explained, holds the key to understanding whether these ubiquitous yet elusive particles have mass, and, if so, how much.

While an advanced degree in physics would probably be necessary to tease out the specifics of the experiment and its findings thus far, it's equally awe-inspiring just to gaze on the dense nest of magnetized steel plates, bunched cables, and a multilevel maze of walkways that we were unable to explore, all constructed to capture evidence of an unlikely and otherwise invisible interaction. It's like sci-fi spy technology, with hidden machines picking up and decoding secret broadcasts within the earth.

Elsewhere in the cavern lay the remains of an abandoned earlier experiment designed to witness proton decay (an event that has still not been observed) and a cryogenic dark matter detector, hunting for WIMPs — the heavy, slow, and potentially even more difficult-to-detect cousins of neutrinos.

Interestingly, MINOS, while being an acronym for Main Injector Neutrino Oscillation Search, also refers to Minos, the mythological king who commissioned Daedalus's labyrinth but went on to be a judge in Hades, the underworld of lost souls.

In the end, it was hard not to wonder what will happen to the machine itself—so heavy it seems effectively pointless for anyone ever to dismantle it—and the brightly lit room it is now housed in. Within even 100, let alone 1,000, 10,000, or even hundreds of thousands of years, this huge gate of iron like a camera lens buried inside the earth, will inevitably fall into disuse, its experimental value gone, its costs too expensive to meet.

Then, someday, if it is not removed piece by piece in a mirror image of the construction process that brought it here, it will outlast even the pyramids, just as mysterious to future generations and just as geometrically abstract as those monumental constructions in the sand.
The paleo-tectonic maps of retired geologist Ronald Blakey are mesmerizing and impossible to forget once you've seen them. Catalogued on his website Colorado Plateau Geosystems, these maps show the world adrift, its landscapes breaking apart and reconnecting again in entirely new forms, where continents are as temporary as the island chains that regularly smash together to create them, on a timescale where even oceans that exist for tens of millions of years can disappear leaving only the subtlest of geological traces.

With a particular emphasis on North America and the U.S. Southwest—where Blakey still lives, in Flagstaff, Arizona—these visually engaging reconstructions of the Earth's distant past show how dynamic a planet we live on, and imply yet more, unrecognizable changes ahead.

The following images come from Ron Blakey's maps of the paleotectonic evolution of North America. The first map shows the land 510 million years ago, progressing from there—reading left to right, top to bottom—through the accretion and dissolution of Pangaea into the most recent Ice Age and, in the final image, North America in its present-day configuration.

Venue met with Blakey in his Flagstaff home to talk about the tectonic processes that make and remake the surface of the Earth, the difficulty in representing these changes with both scientific accuracy and visual panache, and the specific satellite images and software tools he uses to create his unique brand of deep-time cartography.

Like film stills from a 600-million year-old blockbuster, Blakey's maps take us back to the Precambrian—but there are much older eras still, stretching unmapped into far earlier continents and seas, and there are many more billions of years of continental evolution to come. Blakey talked us through some of the most complex changes in recent geological history, including the opening of the North Atlantic Ocean, and he allowed himself to speculate, albeit briefly, about where Earth's continental crust might yet be headed (including a possible supercontinent in the Antarctic).

Many of Blakey's maps are collected in the book Ancient Landscapes of the Colorado Plateau, written with Wayne Ranney, where Blakey also describes some of the research and methods that went into producing them. Blakey also contributed to the recent, new edition of a textbook by Wolfgang Frisch and Martin Meschede, Plate Tectonics: Continental Drift and Mountain Building, a thorough exploration of landscapes disassembling and colliding over vast spans of time.

• • •

The west coast of North America, depicted as it would have been 130 million years ago; the coast is a labyrinth of islands, lagoons, and peninsulas slowly colliding with the mainland to form the mountains and valleys we know today. Map by Ron Blakey.

Geoff Manaugh: When I first discovered your maps showing the gradual tectonic re-location of the continents over hundreds of millions of years, I thought this was exactly what geologists should be doing: offering clear, step-by-step visual narratives of the evolution of the earth’s surface so that people can better understand the planet we live on. What inspired you to make the maps, and how did you first got started with them?

Ronald Blakey: Well, the very first maps I made were in conjunction with my doctoral thesis, back in the early 1970s. Those were made with pen and ink. I made sketches to show what the paleogeography would have looked like for the specific formation I was studying with my doctorate. Three or four of those maps went into the thesis, which was then published by the Utah Geologic Survey. I’ve also done a number of papers over the years where I’ve made sketches.

But I was late getting into the computer. Basically, during my graduate work I never used a computer for anything. I kind of resisted it, because, for the kind of work I was doing, I just didn’t see a need for it—I didn’t do quantifiable kinds of things. Then, of course, along comes email and the Internet. I actually forget when I first started with Photoshop—probably in the mid-1990s. When I found that, I just thought, wow: the power of this is incredible. I quickly learned how to use the cloning tool, so that I could clone modern topography onto ancient maps, and that made things even simpler yet.

Another thing I started doing was putting these maps into presentations. There were something like five different programs back there, in the late 90s, but the only one that survived was PowerPoint—which is too bad, because it was far from the best of the programs. I was using a program called Astound, which was far superior, particularly in the transitions between screens. I could do simple animations. I could make the tectonic plates move, create mountain belts, and so forth.

I retired in May of 2009, but all of my early maps are now online. With each generation of maps that I’ve done, there has been a noted improvement over earlier maps. I find new techniques and, when you work with Photoshop as much as I do, you learn new ideas and you find ways to make things that were a little clumsy look more smooth.

Manaugh: Where does the data come from?

Blakey: It comes from various publications. You can get a publication and have that PDF open, showing what something looked like in the past, and work from that. Usually, what I’m working from are fairly simple sketches published in the literature. They’ll show a subduction zone and a series of violent arcs, or a collision zone. What I do is take this information and make it more pictorial.

If you create a series of maps in sequence, you can create them in such a way that certain geologic events, from one time slice to the next, to the next, to the next, will blend. It depends a lot on the scale of what you’re trying to show—the whole world versus just four or five states in the West.

Now, throughout the years from, let’s say, 2004 until I retired in 2009, I kept improving the website. I envisioned most of this as educational material, and I didn’t pay much attention to who used it, how they used it, and so forth. But, then, shortly before I retired, various book companies and museums—and, most recently, oil companies—have approached me. So I started selling these and I tried very diligently not to allow this to overlap with what I was doing for my teaching and my research at the University.

In the following long sequence of images, we see the evolution of the west coast of North America, its state boundaries ghosted in for reference. Sea levels rise and fall; island chains emerge and collide; mountains forms; inland seas proliferate and drain; and, eventually, modern day California, Vancouver Island, and the Baja peninsula take shape, among other recognizable features. The time frame represented by these images is approximately 500 million years. All maps by Ron Blakey.

Nicola Twilley: What do the oil companies want them for?

Blakey: They’re my biggest customers now. Usually, the geologists at oil companies are working with people who know either much less geology than they do or, in some cases, almost no geology at all, yet they’re trying to convince these people that this is where they need to explore, or this is what they need to do next.

They find these maps very useful to show what the Devonian of North Dakota looked like, for example, which is a hot spot right now with all the shales that they’re developing in the Williston Basin. What they like is that I show what the area might have really looked like. This helps, particularly with people who have only a modest understanding of geology, particularly the geologic past.

Manaugh: What have been some of the most difficult regions or geological eras to map?

Blakey: The most difficult thing to depict is back in the Paleozoic and the Mesozoic. Large areas of the continent were flooded, deep into the interior.

During certain periods, like the Ordovician, the Devonian, and parts of the Jurassic—especially the Cretaceous—as much as two-thirds of the continents were underwater. But they’re still continents; they’re still continental crusts. They’re not oceans. The sea level was just high enough, with respect to where the landscape was at the time, that the area was flooded. Of course, this is a concept that non-geologists really have problems with, because they don’t understand the processes of how continents get uplifted and subside and erode and so forth, but this is one of the concepts that my maps show quite nicely: the seas coming in and retreating.

But it’s very difficult—I mean, there is no modern analog for a seaway that stretched from the Mackenzie River Delta in Canada to the Gulf of Mexico and that was 400 miles wide. There’s nothing like that on Earth today. But the styles of mountains have not dramatically changed over the last probably two billion years—maybe even longer than that. I don’t go back that far—I tend to stick with the last 600 million years or so—but the styles of mountains haven’t changed. The nature of island arcs hasn’t changed, as far as we know.

What has changed is the amount of vegetation on the landscape. My maps that are in the early part of the Paleozoic—the Cambrian and the Ordovician early part of the Silurian—tend to be drab-colored. Then, in the late Silurian and in the Devonian, when the land plants developed, I start bringing vegetation colors in. I try to show the broad patterns of climate. Not in detail, of course—there’s a lot of controversy about certain paleoclimates. But, basically, paleoclimates follow the same kinds of regimens that the modern climates are following: where the oceans are, where the equator is, where the mountain ranges are, and so forth.

That means you can make broad predictions about what a paleoclimate would have been based on its relationship to the equator or based on the presence or absence of nearby mountains. I use these kinds of principles to show more arid areas versus more humid areas.

The next three sequences show the evolution of the Earth's surface in reverse, from the present day to, at the very bottom, 600 million years ago, when nearly all of the planet's landmasses were joined together in the Antarctic. The first sequence shows roughly 90 million years of backward evolution, the continents pulling apart from one another and beginning a slow drift south. They were mapped using the Mollweide projection, and, in all cases, are by Ron Blakey.

Twilley: And you paint the arid area based on a contemporary analog?

Blakey: Right. I know the modern world reasonably well and I’ll choose something today that might have matched the texture and aridity of that older landscape.

I use a program called GeoMapApp that gives me digital elevation maps for anywhere in the world. Most recently, they have coupled it with what they call the “Blue Marble.” NASA has stitched together a bunch of satellite photos of the world in such a way that you can’t tell where one series of photos come in or another. It’s a fairly true-color representation of what Earth would look like from space. So this Blue Marble is coupled with the GeoMapApp’s digital elevation topography; you put the Blue Marble over it, and you use a little slider to let the topography show through, and it gives you a fairly realistic looking picture of what you’re looking for.

For example, if I’m working with a mountain range in the southern Appalachians for a Devonian map—well, the southern Appalachians, during the Devonian, were probably far enough away from the equator that it was in the arid belt. There are some indications of that, as well—salt deposits in the Michigan Basin and in parts of New York and so forth. Plus, there are red-colored sediments, which don’t prove but tend to indicate arid environments. This combination tells me that this part of the world was fairly arid. So I’m going to places like modern Afghanistan, extreme western China, northern Turkey, or other places where there are somewhat arid climates with mountain belts today. Then I clone the mountains from there and put them in the map.

But you have to know the geologic background. You have to know how the mountains were formed, what the grain of the mountains was. That’s not always easy, although there are ways of doing it. To know the grain of the mountains, you need to know where the hinterland and the center of the mountains were. You need to know where the foreland area is, so that you can show the different styles of mountains. You have to move from foreland areas—which tends to be a series of parallel ridges, usually much lower than the hinterlands—to the center and beyond.

I use this kind of information to pick the right kind of modern mountain to put back in the Devonian, based on what that Devonian landscape probably had a good chance of looking like. Do we know for certain? Of course not. We weren’t around in the Devonian. But we have a good rock record and we have a lot of information; so we use that information and, then, voilà.

To give another example, let’s look at the Devonian period of the east coast. The big European continent that we call Baltica collided with Greenland and a series of micro-continents collided further south, all the way down at least as far as New Jersey, if not down as far the Carolinas. We know that there are places on Earth today where these same kinds of collisions are taking place—in the Alps and Mediterranean region, and the Caucasus region, and so forth.

We can use the concept that, if two plates are colliding today to produce the Caucasus mountains, and if we look at the style of mountains that the Caucasus are, then it’s reasonable to think that, where Greenland and Baltica collided in the Silurian and the Devonian, the mountains would have had a similar style. So we can map that.

This second sequence shows the continents drifting apart, in reverse, from 105 million years ago to 240 million years ago. They were mapped using the Mollweide projection, and, in all cases, are by Ron Blakey.

Manaugh: That collision alone—Baltica and Greenland—sounds like something that would be extremely difficult to map.

Blakey: Absolutely. And it’s not a one-to-one relationship. You have to look at the whole pattern of how the plates collided, how big the plates were, and so forth.

Then there’s the question of the different histories of particular plates. So, for example, most of Scotland started out as North America. Then, when all the continents collided to form Pangaea, the first collisions took place in the Silurian-Devonian and the final collisions took place in the Pennsylvanian-Permian. By, say, 250 million years ago, most of the continents were together. Then, when they started to split apart in the Triassic and Jurassic—especially in the Triassic and Cretaceous—the split occurred in such a way that what had been part of North America was actually captured, if you will, by Europe and taken over to become the British Isles.

Scotland and at least the northern half of Ireland were captured and began to drift with Europe. On the other hand, North America picked up Florida—which used to be part of Gondwana—and so forth.

One of the things that is interesting is the way that, when mountains come together and then finally break up, they usually don’t break up the same way that they came together. Sometimes they do, but it has to do with weaknesses, stress patterns, and things like this. Obviously, all time is extremely relative, but mountains don’t last that long. A given mountain range that’s been formed by a simple collision—not that there’s any such thing as a simple collision—once that collision is over with, 40 or 50 million years after that event, there is only low-lying landscape. It may have even have split apart already into a new ocean basin.

But here’s the important part: the structure that was created by that collision is still there, even though the mountains have been worn down. It’s like when you cut a piece of wood: the grain is still inherited from when that tree grew. The pattern of the grain still shows where the branches were, and the direction of the tree’s growth in response to wind and sun and its neighbors. You can’t reconstruct the tree exactly from its grain, but, if you’re an expert with wood, you should be able to look and say: here are the tree rings, and here’s a year where the tree grew fast, here’s a year where the tree grew slow, here’s where the tree grew branches, etc.

In a sense, as geologists, we’re doing the same things with rock structure. We can tell by the pattern of how the rocks are deformed which direction the forces came from. With mountains, you can tell the angle at which the plates collided. It’s usually very oblique. What that tends to do is complicate the geologic structure, because you not only get things moving one way, but you get things dragging the other way, as well. But we can usually tell the angle at which the plates hit.

Then, in many cases, based upon the nature of how the crust has been deformed and stacked up, we can tell the severity of the mountain range. It doesn’t necessarily mean that we can say: oh, this structure would have been a twenty-thousand-foot high mountain range. It’s not that simple at all, not least of which because rocks can deform pretty severely without making towering mountains.

This final of the three global sequences shows the continents drifting apart, in reverse, from 260 million years ago to 600 million years ago. There was still nearly 4 billion years of tectonic evolution prior to where these maps begin. They were mapped using the Mollweide projection, and, in all cases, are by Ron Blakey.

Manaugh: Are you able to project these same tectonic movements and geological processes into the future and show what the earth might look like in, say, 250 million years?

Blakey: I’ve had a number of people ask me about that, so I did make some global maps. I think I made six of them at about 50-million-year intervals. For the fifteen to 100-million-year range, I think you can say they are fairly realistic. But, once you get much past 75 to 100 million years, it starts to get really, really speculative. The plates do strange things. I’ll give you just a couple of quick examples.

The Atlantic Ocean opened in the beginning of the Jurassic. The actual opening probably started off the coasts of roughly what is now Connecticut down to the Carolinas. That’s where the first opening started. So the central part of the Atlantic was the first part to open up. It opened up reasonably simply—but, again, I’m using the word simple with caution here.

The north Atlantic, meanwhile, didn’t open up until about 60 to 50 million years ago. When it opened up, it did a bunch of strange things. The first opening took place between Britain and an offshore bank that’s mostly submerged, called Rockall. Rockall is out in the Atlantic Ocean, northwest of Ireland—near Iceland—but it’s continental crust. That splitting process went on for, let’s say, ten million years or so—I’m just going to talk in broad terms—as the ocean started opening up.

Then the whole thing jumped. A second opening began over between Greenland and North America, as Greenland and North America began to separate off. That lasted for a good 40 or 50 million years. That’s where you now get the Labrador Sea; that is actual ocean crust. So that was the Atlantic Ocean for thirty or forty million years—but then it jumped again, this time over between Greenland and what is now the west coast of Europe. It started opening up over there, before it jumped yet again. There’s an island in the middle of the North Atlantic, way the heck up there, called Jan Mayen. At one time, it was actually part of Greenland. The Atlantic opened between it and Greenland and then shifted to the other side and made its final opening.

The following two sequences show the evolution of Europe from an Antarctic archipelago to a tropical island chain to the present day Europe we know and recognize. The first sequence starts roughly 450 million years ago and continues to the Jurassic, 200 million years ago. All maps by Ron Blakey.

So it’s very complicated. And that’s just the Atlantic Ocean.

The Northern Atlantic took at least five different paths before the final path was established, and it’s all still changing. In fact, the south Atlantic is actually even worse; it’s an even bigger mess. You’ve got multiple openings between southwest Africa and Argentina, plus Antarctica was up in there before it pulled away to the south.

These complications are what makes this stuff so interesting. If we look at events that we can understand pretty well over the last, let’s say, 150 or 200 million years of time—where we have a good indication of where the oceans were because we still have ocean crusts of that age—then we can extrapolate from that back to past times when oceans were created and destroyed. We can follow the rules that are going on today to see all of the oddities and the exceptions and so forth.

These are the kinds of things I try to keep track of when I’m making these maps. I’m always asking: what do we know? Was it a simple pull-apart process? There are examples where continents started to split across from one another, then came back together, then re-split in a different spot later on. That’s not just speculation—there is geologic evidence for this in the rock record.

So, when it comes to extrapolating future geologies, things become very complicated very quickly. If you start thinking about the behavior of the north Atlantic, creating a projection based on what’s going on today seems, at first, like a fairly simple chore. North America is going on a northwesterly path at only one or two centimeters a year. Europe is moving away, at almost a right angle, at about another centimeter a year. So the Atlantic is only opening at three centimeters a year; it’s one of the slowest-opening oceans right now.

OK, fine—but what else is happening? The Caribbean is pushing up into the Atlantic and, off South America, there is the Scotia Arc. Both of those are growing. They’ve also identified what looks like a new island arc off the western Mediterranean region; that eventually would start to close the Atlantic in that area. Now you start to speculate: well, these arcs will start to grow, and they’ll start to eat into the oceans, and subduct the crusts, and so forth.

Again, for the first 50, 75, or even 100 million years, you can say that these particular movements are fairly likely. But, once you get past that, you can still use geologic principles, but you’re just speculating as to which way the continents are going to go.

For instance, the one continent that does not seem to be moving at all right now, relative to anything else, is Antarctica. It seems to be really fixed on the South Pole. That’s why some people think that everything will actually coagulate back towards the South Pole. However, there are also a bunch of subduction zones today along southern Asia, and those are pretty strong subduction zones. Those are the ones that created the big tsunami, and all the earthquakes off of Indonesia and so forth. Eventually, those could pull either parts of Antarctica or all of Antarctica up toward them.

But I’m more interested in reconstructing the past than I am the future, so I’ve only played around with those five or six maps.

This second sequence, showing the next phase in the evolution of Europe, begins approximately 150 million years ago and extends to the present day. All maps by Ron Blakey.

Manaugh: To ground things a bit, we’re having this conversation in Flagstaff, on the Colorado Plateau, which seems like a great place to teach geology. I wonder whether there might be another Colorado Plateau, so to speak, elsewhere in the world—something geologically similar to the extraordinary landscapes we see here that just hasn’t had the chance to emerge. Maybe the tectonics aren’t right, and it’s still just a crack, rather than a canyon, or maybe it’s covered in vegetation or ice so we can’t see it yet. Conversely, I’m curious if you might have found evidence of other great geological districts in the earth’s past—lost Grand Canyons, other Arches National Parks—that have been lost to time. How could we detect those, and where are they?

Blakey: This is indeed a great place to teach geology. It’s a great place to live.

As for Colorado Plateau analogs—it’s an interesting question. There’s an area in South America that I’d say is fairly similar. It’s got a couple of famous national parks that I can't remember the name of. It’s a smaller version, but it’s very similar to the Colorado Plateau. It’s between the Andes and the Amazon basin, part of the general pampas region there of South America. It even has similarly aged rocks. Parts of northern Africa would also be similar.

But you have to look at all the characteristics of the Plateau. Number one: the rocks are flat. Number two: the rocks have been uplifted. Number three: the rocks are dissected by a major river system. Number four: it’s a semi-arid climate. There are probably five or six defining characteristics in total, and I’ve heard many people say that there is no other place else on Earth that has all those characteristics in exactly the same way. But I went to an area in eastern Mauritania many years ago, where, for all the world, it looked like the Grand Canyon. It wasn’t as colorful, but it was a big, deep canyon.

In fact, the Appalachian Plateau would be somewhat similar, except it’s in a humid climate, which means the land has been shaped and formed differently. But the Appalachian plateau has flat-lying rocks; it’s dissected by some major rivers; it’s experienced uplift; and so forth.

The next two sequences of images, followed from left to right, top to bottom, illustrate the gradual evolution of the Colorado Plateau, where, in its modern day incarnation, this interview with Ron Blakey took place (specifically, in Flagstaff, Arizona. The earliest map included here depicts the Proterozoic; the first sequence ends in the Triassic. All maps by Ron Blakey.

Twilley: I’m interested in the representational challenges you face when you decide to make a map, and, specifically, when you’re in Photoshop, what your most-used tools might be. I thought it was fascinating when you said that the cloning tool really changed how you make geological maps. What other techniques are important to you, in order to represent geological histories?

Blakey: Oh, the cloning tool is the most important, by far—at least when I’m actually painting. Of course, I use the outline tool to select areas, but, when I’m actually painting, it would be impossible to paint these different maps pixel by pixel. I couldn’t do it. Occasionally, I will actually hand-draw some things in the flatlands, where I want to put a river system, for example, but, at least for mountains and rugged terrain, I clone everything.

Some times, I’ll cut and paste. I’ll select an area in the GeoMapApp, I save it as a JPEG, and then I can select it and copy it and paste it in, and I can rotate and deform it a little bit. Are you familiar with the warp tool in Photoshop? I use that a lot, because you can change the shape of mountains a little. If you do it too dramatically, it really looks flaky. But, if you do it right, it still looks pretty realistic.

This second sequence, also showing the evolution of the Colorado Plateau, begins with the Triassic and ends roughly 5 million years ago—basically the present day, in geological terms. All maps by Ron Blakey.

Twilley: And do you have certain filters you rely on for particular geological effects?

Blakey: A little bit. I like to use the craquelure filter. It actually gives you little bumps and valleys and so forth. I use that especially for continental margins. Continental margins are anything but regular slopes, going down to the abyssal depths. They’re very irregular. There are landslides and all kinds of things going on there at the margins, so I add a little texture with craquelure.

It can be difficult to use, though, and it doesn’t work at really high resolutions—so, what I actually have to do some times, is that I will actually copy a part of my map, take it out, make it smaller, do the craquelure on it, and then blow it back up and paste it in again.

A painting by Ron Blakey depicts a geological landscape near Sedona, Arizona.

Dee Blakey, Ron's Wife: I think the other reason that he can do what he does is that he paints. That’s one of his paintings, that one over there [gestures above fireplace].

Blakey: Well, I guess I should have said that right away, when you asked me why I got interested in this, because I am interested in the artistic aspect of geology. The artistic aspect of science, in general, but especially geology. Astronomy, for example, would be another field where artistic visualizations are useful—any time you’re trying to show things that can’t easily be visualized with something comparable here on present-day planet Earth, you have to use an artistic interpretation.

Anyway, I can’t explain it, but I understand color pretty well. I use the hue saturation tool a lot. I’ll select an area and then I’ll feather it, let’s say, because you don’t want the edges to be sharp. I’ll feather it by thirty, forty, fifty pixels. Then I'll take the slider for hue saturation, where, if you go to the left, you make things redder and, if you go to the right, you make things greener. If I’ve got a landscape that looks a little too humid, I’ll just slide it slightly to the left to make it a bit redder. You can also change the lightness and darkness when you do that. There’s also regular saturation. By killing the saturation, you can really kill the nature of a landscape quite a bit.

And I use hue saturation a lot. That took me a long time to master, because it’s really easy to screw things up with that tool. You start sliding things a little too far and, whoa—wait a minute! All of a sudden, you’ve got purple mountains.
After a long drive down toward the Shenandoah Valley, passing southwest across Pennsylvania into the mountains of Virginia, Venue arrived near sunset at Luray Caverns, just in time for their final tour of the day.

The surreally ordinary door through which you access Luray Caverns.

Discovered in 1878, the caves at Luray remain on private property. This means that, unlike their counterparts in the National Park Service, whose educational and recreational programs are constrained by strict ecological and historic preservation guidelines, Luray is a show cave—an artful blend of natural and built subterranean forms, visited by roughly five million people a year.

State laws extend into the subterranean world.

Also a popular destination for school field trips, the caverns are by no means wild or remote; they are well-lit, family-friendly, and not insignificantly altered, with as much as twenty percent of the original cave, our guide explained, removed or expanded to accommodate human passage.

The caverns, which extend throughout an area nearly sixty-four acres in size, are home to an array of formations, from dripping pillars that look as much like lithified swarms of ancient jellyfish as they do columns of rock to semi-translucent rippling curtain forms known as "cave bacon" and an extraordinary reflective lake filled with crystal-clear (although very shallow) water.

Their showpiece, however, is a nearly four-acre underground musical instrument made from the stalactites of the cave itself.

Yes, that's acres.

This organ, the Luray Cavern's website explains, was "conceived" by a man named Leland W. Sprinkle, "a mathematician and electronics scientist at the Pentagon."

The keyboard of the organ.

The instrument visitors now encounter, extensively wired up to the labyrinth of stalactites hanging down from the ceiling, actually takes its inspiration from an earlier version, as Russell H. Gurnee explains in his informative booklet Discovery of Luray Caverns, Virginia.

"A wall decoration not far from the Saracen's Tent," Gurnee writes, describing the "original natural instrument" from which Sprinkle's invention takes its cue, was not invented, as such, but instead "consisted of fifty-six graduated columns arranged like the pipes of an organ."

These graduated columns could be played: tapped with hammers or a flashlight, and resonant tones would result.

The mallets are remarkably easy to miss.

Sprinkle's organ relies on the same principle—tapping stalactites of different size and resonance, like a xylophone—but at a much more awe-inspiring scale. The organ keys are connected to small rubber mallets strung up to the rocks by way of five miles' worth of wires.

In the words of Luray's administrators, this "stalactite-tapping instrument" apparently took thirty-six years to perfect: "Three years alone were spent searching the vast chambers of the caverns to select and carefully sand stalactites to precisely match the musical scale. Only two stalactites were found to be in tune naturally."

The deliberately theatrical, Willy Wonka-like red keyboard adds to the sense of tourist gimmickry that pervades most show-caves—the addition of manmade wonders ("the largest musical instrument on earth!") sitting uncomfortably alongside the subterranean sublime.

The organ's music is, nonetheless, sonorous, omnidirectional, and highly atmospheric, as well as a virtuoso display of mechanical invention.

Instagrams of mallets and wires cobwebbed across the cave.

Only one man plays the organ, our guide informed us, but in his absence, we instead listened to a preprogrammed sequence, a kind of geological piano player; the song we thus heard was an old hymn by Martin Luther, called "A Mighty Fortress Is Our God."

It percussed and rang across the cobweb of rubber hammers in speleological surroundsound, indicating through echoes that there were yet more distant parts of the cave we would not have time to explore.

We stood there for three or four minutes in appreciative silence, listening to this electrical contraption that formalized the otherwise random actions of an earlier generation of explorers who merely tapped on the rocks around them. A habit, you might say, became a machine.

Hearing the Earth ping with music written centuries ago, it was hard not to wonder how literally fantastic it would be to have one's own, secret access to some vast subterranean instrument wired together in tangles of valves, mallets, and wires—sitting alone at night in a mansion in the mountains of Virginia, perhaps, as a fog sets in, playing this buried machine that uses the planet itself as a resonation chamber, hollow cavities, from the smallest tunnels to gigantic chasms several counties away, shivering with the induced seismicity of your own music. Sounds hum up through your old wooden floorboards, and glassware in the kitchen begins to vibrate.

Until such a day, it's easy enough just to listen to Luray on CD: indeed, we picked up a copy of a 2001 album offered by the shop upstairs called Midnight in the Caverns by Monte Maxwell. In that recording, the triggering of the mallets is clearly audible as a kind of secondary clicking beneath the music, which gives the songs a slightly robotic feel—an extra layer of strangeness that, like the addition of the organ to the caverns, it didn't need but, in the end, isn't any the worse for. We put the CD on repeat for the next few hours as Venue left Luray behind.

You're looking at something pretty amazing: a photograph of a photograph taken by Edward Burtynsky, one of the world's most celebrated landscape photographers, especially for Venue.

Except that Burtynsky took the photograph using Matt Richardson's Descriptive Camera — our guest device on this leg of Venue's travels — which means that, instead of Burtynsky's carefully selected and composed image, we instead have a short description written by an anonymous worker for a $1.25 reward.

For those of you who are not familiar with it, the Descriptive Camera works by sending the images it captures off to Amazon's Mechanical Turk jobs board, where anyone, based anywhere in the world, can choose to accept the task of describing it for a fee.

In this case, our lucky anonymous worker saw a brand new photograph by Edward Burtynsky, entered a few lines of text, and then hit send. Back in the bright yellow service staircase of the Nevada Museum of Art, we waited patiently till their description printed out, like a receipt, from the front of the camera.

A quick snapshot of Burtynsky taking the photo in question. We gave him 24 hours to select a subject in the museum, and this was the spot that caught his eye. Photograph by Geoff Manaugh.

And there it is: "A network of pipes, having valves and joints with meters between them." Burtynsky, in someone else's words.

The shooting of this photograph followed a morning of hearing Burtynsky in his own words, in a special lecture at the Nevada Museum of Art on the occasion of the opening of his new Oil exhibition, followed by a fascinating conversation with Venue—our inaugural interview—during which we discussed drones, collective acts of consumption, his deliberate avoidance of the colors green and blue, and the seemingly impossible challenge of making a compelling photograph of Niagara Falls.

We'll be posting the full transcript of that conversation, with images, online here shortly.
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