A Recipe for Sentience: The Energetics of Intelligence

This article was originally written for a collaborative blog known as Science in my Fiction, where writers could submit articles about various points of scientific knowledge that could be used to inform fantasy or science fiction writing.  It is the only piece I have complete that was not written either just for my circle of friends or for a technical audience.

The website eventually went defunct due to a lack of updates, so I have reproduced it in full here.


“No man can be wise on an empty stomach.”

Mary Anne Evans, under the pseudonym George Eliot

Humans have been suffering from a bit of a self-image problem for the last half century.

First we were Man the Tool-Maker, with our ability to reshape natural objects to serve a purpose acting to  separate us from the brute beasts.  This image was rudely shattered by Jane Goodall’s discovery in the 1960s that chimpanzees also craft and use tools, such as stripping leaves from a twig to fish termites out of their nest to eat.

Then we were Man the Hunter.  We’d lost our tool-making uniqueness but we still had our ability to kill, dismember, and eat much larger animals with even simple tools, and it was thought that this ability unlocked enough energy in our diet to fuel the growth of larger body size and larger brains1.  Of course, then we found out that although it is not a large component of the diet, chimpanzees eat enough meat to act as significant predators on other primates in their forest homes.

So meat eating by itself doesn’t seem to make us as distinct from our closest living relatives as we had previously thought, and the argument of what makes us special has since moved on to language.  That does leave a standing question, though: if it wasn’t meat-eating that allowed us to get bigger and more intelligent, what was it, exactly?

While there is evidence in the fossil record that eating raw meat allowed humans to gain more size and intelligence, it is both unlikely that we were the hunters and that this behavioral change was enough to unlock a significant jump in brain size.  Instead, there is another hypothesis and human identity that has been gaining more traction as of late: the concept of Man the Cooking Animal, the only animal on Earth that can no longer survive on a diet of raw food because of the energy demands of its enormous brain2.

Napoleon is famously said to have declared that an army marches on its stomach (at least, after what may be a loose translation).  That is, the power of an army is limited by the amount of food that a society can divert to it.  What we have come to realize more recently is that this same limitation exists inside the body, be it human, animal, or speculative alien species.  No matter what the diet, a creature will only have a fixed amount of energy available to divert to activities such as maintaining a warm-blooded body temperature (homeothermy), digestion, reproduction, and the growth and maintenance of tissues.  We can track some of these changes in the human line in the fossil record, but others must at best be more speculative due to the difficulty of preserving evidence of behavioral changes (which of course, do not fossilize) as well as limited research on modern examples.  We’ll start by looking at the evolutionary pathway of humans to see what information is currently available.

The Woodland Ape and the Handy Man

The oldest definite human ancestors that we can unequivocally identify as part of our line lie in the genus Australopithecus.  These have been identified by some authors as woodland apes, to distinguish these more dryland inhabitants from the forest apes that survive today in Africa’s jungles (chimpanzees, bonobos, and gorillas).  They are much smaller than a modern human, only as tall as a child, but they have already evolved to walk upright.  They still show adaptations for climbing that were lost in later species, suggesting they probably escaped into the trees at night to avoid ground predators, as modern chimps do.  Their brains were not much larger than a modern chimpanzee’s, and their teeth are very heavy, even pig-like, as an adaptation to a tough diet of fibrous plant material – probably roots, tubers, and corms, perhaps dug from plants growing at the water’s edge2,3.

The hominoids thought to have first started eating meat are Homo habilis, the “handy man”, and the distinction between them and the older Austrilopithecus group from which they descended are not very large.  The two are close enough that Homo habilis has been suggested it might be more properly renamed to Australopithecus habilis, while the interspecies variation suggests to some researchers that what we now call habilis may represent more than one species4Whatever its proper taxonomic designation, H. habilis shows a modest increase in brain size and evidence that it was using simple stone tools to butcher large mammals, probably those left behind by the many carnivorous mammals that lived on the savannahs and woodlands alongside it.

The transition between H. habilis and H. erectus is far more distinctive, with a reduction in tooth size, jaw size, and gut size, and an increase in brain volume.  They are also believed to have been larger, but the small number of available hominid fossils makes this difficult to verify.  H. erectus is also the first human to have been found outside of Africa.  While the habilis-erectus split has been attributed to the eating of significant amounts of meat in the Man-the-Hunter scenario (recall that habilis, despite its tool-using ability for deconstructing large animals, does not appear to have hunted them), the anthropologist Richard Wrangham has suggested that the turnover instead indicates the first place at which humans began to cook2,3.  Because the oldest solid evidence of cooking is far younger than the oldest known fossils of erectus, what follows is largely based on linking scraps of evidence from modern humans and ancient fossils using what is known as the Expensive-Tissue Hypothesis.

Brains versus Guts: The Expensive-Tissue Hypothesis

The Expensive-Tissue Hypothesis was first proposed by Leslie Aiello and Peter Wheeler in 19955, and it goes something like this: large brains evolve in creatures that live in groups because intelligence is important to creating and maintaining the social groups.  This is known as the social brain hypothesis, and it helps to explain why animals that live socially have larger brains than their more solitary relatives.  However, not all social primates, or even social animals, have particularly large brains.  Horses, for example, are social animals not known for their excessively large brain capacity, and much the same can be said for lemurs.  Meanwhile, apes have larger brains than most monkeys.  This can’t be accounted for purely by the social brain hypothesis, since by itself it would suggest that all social primates and perhaps all social animals should have very big brains, rather than the variation we see between species and groups.  What does account for the difference is the size of the gut and, by extension, the quality of the diet.

Both brains and guts fit the bill for expensive body tissues.  In humans, the brain uses about 20% of the energy we expend while resting (the basal metabolic rate, or BMR) to feed an organ that only makes up 2.5% of our body weight2.  This number goes down in species with smaller brains, but it is still disproportionately high in social, big-brained animals.  Aiello and Wheeler note that one way to get around this lockstep rule is to increase the metabolic requirements of the species5 (i.e., throw more calories at the problem), but humans don’t do this, and neither do other great apes.  Our metabolic rates are exactly what one would expect for primates of our size.  The only other route is to decrease the energy flow to other tissues, and among the social primates only the gut tissue shows substantial variation in its proportion of body weight.  In fact, the correlation between smaller guts and larger brains lined up quite well in the data then available for monkeys, gibbons, and humans5.  Monkeys and other animals that feed on low-quality diets containing significant amount of indigestible fibers or dangerous plant toxins have very large guts to handle the problem and must expend a significant amount of their BMR on digestion, and have less extra energy to shunt to operate a large brain.  Fruit-eating primates such as chimpanzees and spider monkeys have smaller guts to handle their more easily-digested food, and so have larger brains.  Humans spend the least amount of time eating of any living primate, with equally short digestion times as food speeds through a relatively small gut.  And ours, of course, are the largest brains of all2.

These tradeoffs are not hard-linked to intestinal or brain size, and have been demonstrated in other species.  For example, there is a South American fish species with a tiny gut that uses most of its energy intake to power a surprisingly large brain, while birds with smaller guts often use the energy savings not to build larger brains, but larger, stronger wing muscles2.  Similarly, muscle mass could be shed instead of gut mass to grow a larger brain or to cut overall energy costs.  The latter strategy is the one taken up by tree-dwelling sloths to survive on a very poor diet of tough, phytotoxin-rich leaves, and although it makes them move like rusty wind-up toys it also allows them to live on lower-quality food than most leaf-eating mammals.

Modern humans have, to a degree, taken this approach as well.  When compared to one of our last surviving relatives, H. neanderthalensis, humans have a skeletal structure that paleontologists describe as “gracile:” light bones for our body size, anchoring smaller muscles than our shorter, heavier relatives.  Lower muscle and bone mass in H. sapiens gives us an average energy cost on the order of 1720 calories a day for males and 1400 calories a day for females in modern cold-adapted populations, which are thought to have similar metabolic adaptations for cold weather as the as extinct Neanderthals.  By contrast, H. neanderthalis has been estimated to need 4000-7000 calories a day for males and 3000-5000 calories for females, with the higher costs reflecting the colder winter months6.

Cooked versus Raw

 At the point where human brain size first increases dramatically (H. erectus, as you might recall), both guts and teeth reduce significantly while the brain increases.  The expensive tissue hypothesis explains the tradeoff between guts and brains, but cooking provides a possible explanation for how both the teeth and the guts could reduce so significantly while still feeding a big brain.

Data on the energetics of cooked food are currently limited, but the experiments that have been performed so far indicate that the softer and more processed the food the more net calories are extracted, since less calories need to be spent on digestion.  A Japanese experiment with rats showed that they gained more weight on laboratory blocks that had been puffed up like a breakfast cereal versus rats on normal blocks, even though the total calories in the food were the same and the rats spent the same amount of energy on exercise2.  Similarly, experiments with pythons show that they expend about 12% more energy breaking down whole meat than either meat that has been cooked or meat that has been finely ground.  The two treatments reduce energy cost independently of each other, meaning that snakes fed ground, cooked meat used almost 24% less energy than pythons fed whole raw meat or rats2.

There is even less data on how humans utilize cooked food versus raw food.  Because it only recently occurred to us that we might not be able to eat raw food diets like other animals, only a few studies exist.  So far the most extensive is the Giessen Raw Food study performed in Germany, which used questionnaires to collect data from 513 raw foodists in Germany who eat anywhere from a 75% to 100% raw food diet.  The data are startling.  Modern humans appear to do extremely poorly on diets that our close relatives, the forest apes, would get sleek and fat on.  Body weights fall dramatically when we eat a significant amount of raw food, to the point where almost a third of those eating nothing but raw had body weights suggesting chronic energy deficiency.  About half of the women on total raw food diets had so little energy to spare that they had completely ceased to menstruate, and 10% had such irregular cycles that they were likely to be completely unable to conceive at their current energy levels2.   Mind you, these are  modern first-world people with the advantage of high-tech processing equipment to reduce the energy cost of eating whole foods, far less energy expenditure required to gather that food, and a cornucopia of modern domestic plants that have been selectively bred to produce larger fruits and vegetables with and lower fiber and toxin contents than their wild counterparts.  The outcome looks more dismal for a theoretical raw-food-eating human ancestor living  before the dawn of civilization and supermarkets.

Fantastic Implications

 What this all ultimately suggests is that there are tradeoffs in the bodies of intelligent creatures that we may not have given much consideration: namely, that to build a bigger brain you either need a much higher level of caloric intake and burn (high BMR) or the size and energy costs in something in the body have to give.  Certain organs do not appear to have much wiggle room for size reduction, as Aiello and Wheeler discovered; hearts for warm-blooded organisms need to be a certain size to provide enough blood throughout the body, and similarly lungs must be a particular size to provide enough surface area for oxygen to diffuse into the blood.  However, gut size can fluctuate dramatically depending on the requirements of the diet, and musculature can also reduce to cut energy costs.

Humans seem to have done an end-run around some of the energy constraints of digestion by letting the cultural behaviors of cooking and processing do the work for them, freeing up energy for increased brain size following social brain hypothesis patterns.  This is pretty classic human adaptive behavior, the same thing that lets us live in environments ranging from arctic to deep desert, and should therefore not come as a great surprise.  It does, however, give us something to think about when building intelligent races from whole cloth: what energy constraints would they run up against, and assuming they didn’t take the human path of supplanting biological evolution with culture, how would they then get around them?

Fantasy monsters and evil humanoids in stories tend to be described as larger and stronger than humans (sometimes quite significantly so) and as raw meat eaters, particularly of humanoid meat.  There’s a good psychological reason for doing so – both of these characteristics tap into ancient fears, one of the time period not so long ago when humans could end up as prey for large mammalian predators, and the other a deep-seated terror of cannibalism without a heavy dose of ritualism to keep it in check.  However, both the Neanderthal example and the Expensive Tissue Hypothesis suggest that such a species would be very difficult to produce; there’s a very good reason why large mammalian predators, whatever their intelligence level, are rare.  It wouldn’t be a large shift, however, to take a monstrous race and model them after a hybrid of Neanderthal and grizzly bear, making them omnivores that can supplement their favored meat diet with plant foods and use cooking to reduce the energy costs of digestion.  Or perhaps their high caloric needs and obligate carnivory could become a plot point, driving them to be highly expansionistic simply in order to keep their people fed, and to view anything not of their own race as a potential meal.

On the science fiction front, it presents limitations that should be kept in mind for any sapient alien.  To build a large brain, either body mass has to give somewhere (muscle, bone, guts) or the caloric intake needs to increase to keep pace with the higher energy costs.  Perhaps an alien race more intelligent than humans would be able to do so by becoming even more gracile, with fragile bones and muscles that may work on a slightly smaller, lower-gravity planet.  Or perhaps they reduce their energy needs by being an aquatic race, since animals that swim generally use a lower energy budget for locomotion than animals that fly or run7.

From such a core idea, whole worlds can be spun: low-gravity planets that demand less energy for terrestrial locomotion; great undersea empires in either a fantastic or an alien setting, where water buoys the body and reduces energy costs enough for sapience; or creatures driven by hunger and a decidedly human propensity for expansion that spread, locust-like, across continents, much as we did long ago when we first left our African cradle.

Food for thought, indeed.


  1. Stanford, C.B., 2001.  The Hunting Apes: Meat Eating and the Origins of Human Behavior.   Princeton, NJ: Princeton University Press.
  2. Wrangham, R., 2009. Catching Fire: How Cooking Made us Human. New York, NY: Basic Books.
  3. —-, 2001. “Out of the Pan, into the fire: from ape to human. ”  Tree of Origin: What Primate Behavior Can Tell us About Human Social Evolution.  Ed.  F.B.M. de Waal.   Cambridge, MA:  Harvard University Press.   119-143.
  4. Miller, J.A., 1991. “Does brain size variability provide evidence of multiple species in Homo habilis?American Journal of Physical Anthropology 84(4): 385-398.
  5. Aiello, L.C. and P. Wheeler, 1995. “The Expensive-Tissue Hypothesis: The Brain and the Digestive System in Human and Primate Evolution.” Current Anthropology 36(2): 199-221.
  6. Snodgrass, J.J., and W.R. Leonard, 2009. “Neanderthal Energetics Revisited: Insights into Population Dynamics and Life History Evolution.” PaleoAnthropology 2009: 220-237.
  7. Schmidt-Nielsen, K., 1972. “Locomotion: Energy cost of swimming, flying, and running.” Science 177: 222-228.

Fire and Ice

This account of a field trip taken to Death Valley for a sedimentology class I was taking dates back to Spring 2004, about halfway through my graduate career.  I originally wrote this for Livejournal back when it was the big social network thing and hadn’t yet been eclipsed by Facebook.

This version has been modified slightly to be able to stand on its own as a combination travelogue and discussion of the geological past.


The Death Valley region is at once the hottest spot and lowest point in North America. The two are related; since the temperature of air is related to its height above sea level due to the change in pressure, air sunk below the level of the sea at the bottom of the valley compresses and warms (a process known as adiabatic heating). Death Valley is an ancient lakebed, where all that remains of Pleistocene Lake Manly today are the harsh mineral salts lining the bottom. The rocks that surround it are older still, the remains of ancient seas. We’re far enough inland to find very old strata, originally laid down on a world radically different than the one we know now. Atmospheres without oxygen, hot worlds without ice – or frozen worlds trapped beneath it, where North America bows under the weight of the Laurentide ice sheet, or the young Earth is buried under a kilometer of glacial ice. Hothouse and icehouse, cycling throughout the Phanerozoic through to the present day.

Whether our world will end in fire or ice, it was born in both.


Day One

Modern Day – Fire

The initial jumping-off point for this trip isn’t even in Death Valley proper, which we never actually spent time in, but the next valley over. We’re supposed to meet up in a little town called Shoshone. We are accompanied by an undergraduate student, Vicks, who isn’t in the class but is coming along as a combination of moral support and photographer.  She is lucky enough to fly in with the ringmaster of this whole trip (one Martin Kennedy by name) but the rest of us are driving, and somewhere along the line half our little car caravan managed to inexplicably disappear.  I spend as much time during this as possible asleep. What we’re driving through looks something like this, at least from the air:It’s counterintuitive, but desert landscapes such as this one are primarily shaped by water. Deserts don’t see much rain, so the land and the plants are not well adapted to large-scale rainfall. Rocks weather locally into clays that carpet the ground and make it hard for water to soak in. Plants are sparse, with deep instead of spreading roots, and they don’t do much to break up the soil. When it does rain in Death Valley, the rains become floods. Only heavy boulders and sticky clay, which require a huge amount of water energy to lift and transport, are left behind in the canyons between the mountains as a storm becomes a torrent down the slopes, spilling its sediment at the bottom as broad alluvial fans once it becomes unchannelled and loses steam.

This desert even has a river, the Amargosa. For reasons unknown it makes a sharp u-turn to the north just southeast of Death Valley, never reaching the sea, spilling out its last drops onto places like Badwater and Devil’s Golf Course. It’s too late in the year for there to be water in the Amargosa, so right now it’s dry.
14,000 years before present – Ice First stop is at a relatively young sedimentary environment, at least in terms of the rocks we’ll be looking at for most of this trip. We’re at the edge of a hot spring wetland – quite possibly the last thing I expected to be standing on the edge of, at least out here. Reeds and green algal mats grow in water heated from below by mantle warmth, and shade a shoreline crusted with mineral salts. Inexplicably, there are tiny fish living in this bubbling brew of microbial mats and geologic heat, probably desert pupfish. There’s also a horrific amount of flies, some of which are easily large enough to carry off the pupfish.
Death Valley is a pull-apart basin, a rip in the crust formed at the edge of two sliding crustal plates where they don’t quite shear smoothly against each other. Such tears reach very, very deep, more so than most geologic basins. There’s a vaguely inorganic smell in the air, the odor of mineral-rich water. It’s mostly dampened by the smell of rotting algae.

The hummocky rolling hills around the existing lake are the soft sediments that remain of a much larger body of water. Glacial lake Tecopa was born in the last glacial maximum, when the creeping ice sheets elsewhere in the country forced the jet stream south, covering the southwest with rain. The storms this region saw during that time were similar to those that fall over Northern California and Oregon in our modern interglacial climate. Death Valley was drowned by an Ice Age body of water known as Lake Manly, and the area was flush with greenery.
Onwards to more lake deposits near China Ranch. These are older, Miocene and Pliocene in age, somewhere between 24 and 2 million years old. We’re getting into some serious Wile. E. Coyote territory once we arrive:

We’re not looking at that right now, however. At the moment we’re poking at claystone lake sediments, chewing on the rocks and showing Vicks how to tell various clays apart. Smectites, when placed on the tongue, will stick; others do not; this leads a bit of a Dumb Geologist Trick whereby you stick bits of the outcrop to our tongue and then stick your tongue at someone else both to prove the type of clay it is primarily composed of and to gross them out slightly. The lake sediments are softer and more homogenous than the rocks making up the arches and the hoodoos we had seen before.  These are soft claystones laid down in the bottom of an ancient lake, while the others are alluvial fan conglomerates (fanglomerates).

The claystones are packed chock full of gypsum, indicating a lake subject to periodic drying, further reinforced by the fact that elsewhere, the fibrous gypsum can be seen filling in v-shaped mudcracks. We’re on the edge of what may have been a desert playa lake. Perhaps the ice sheets were retreating, and the region was drying out.

This place may have seen more than one lake, perhaps related to another pulse of glacial advance. Dry out a lake, uplift its sediments and warp them from tectonic stress so they no longer lie horizontal, erode them down and put more sediments on top, and you have yourself an angular unconformity such as this one, made up of lake sediments both above and below.

To lithify, uplift, tilt and erode strata takes enormous amounts of time.  The deposition of soft claystones, which settle as millimeter-thick layers in still, quiet water, takes more time still. James Hutton, the father of modern geology, once said he could see the dizzying depths of geologic time in an angular unconformity such as this one – “No vestige of a beginning, no prospect of an end.”  This one’s not quite as dizzying, but that’s because the west coast of North America is geologically very active compared to the beaches of Scotland.

We break for one of China Ranch’s famous date shakes before leaving behind sediments left by a modern-looking Earth. Enough of these young Cenozoic deposits; back we go in time, skipping most of the Phanerozoic in the process.


545 million years before present – Fire

Most of the west coast of North America disappears, as it has not accreted yet. The young North American craton stops much farther east than it does today (roughly around here) and most of it is flooded by warm, shallow oceans.The entire continent rests near the equator. We stop on the road at the boundary between Phanerozoic and Proterozoic, early in the Cambrian, at the bottom of a very long slope leading up to this:

The steel-gray cap atop the hillside is the early Cambrian Bonanza King Formation. It represents the remains of an ancient tropical carbonate platform – think Bahama Banks, I suppose, with clear blue water and white carbonate sands. Where scleractinian corals build tall, complex reefs today, ancient calcified sponges called archaeocyathids built their slender branching frameworks, held together by calcified microbes. They’re too small to be called reefs, so they’re typically known simply as “bioherms.”

But that formation and its shallow seas lie far upslope. Right now we’re down in the Stirling Quartzite, the boundary between the Cambrian and the Precambrian, cursing and arguing and trying to measure the first 300-odd meters that represents the initial shoaling cycle, where deepwater sediments give way to progressively shallower, lower-energy ones as the sedimentary basin becomes filled over time. Vicks wandered off and found evidence that someone else had been out here before.
Sun’s going down. We take a break back at Shoshone for dinner and beer at the Crow Bar, since it’s too dark to get much done in the way of work and we’re all tired anyway. While the other students (and the teacher) play pool, Vicks and I crouch out back to alternately photograph and annoy a stray Western toad, Bufo borealis.

Time to go make camp.


Day Two

Ugh. It’s too damned early to be awake, but we’re up anyway. Now that there’s actual light to see it becomes obvious that we camped among cliffs of soft ash-fall tuff, probably generated by Pleistocene volcanism. I’m not sure we’re actually supposed to be camping here, but as they say, it’s easier to beg forgiveness than permission. This seems to have been the approach everyone else took, as people have been busily carving caves out of the cliffs here for some time now.

A a bit of coffee and breakfast later, and we’re off.

I see too many damned sunrises in this line of work. Don’t know why people tend to make a big deal out of them, but I guess that’s because other people aren’t expected to be crawling on rocks just after dawn. Then again, it may also have something to do with the fact that I take to mornings like a lead duck to water.


1 billion years before present – Fire

Once again we stand on the remains of an ancient carbonate shelf, but this one is much older than yesterday’s Bonanza King. Tiny photosynthetic microbes built reef-like bioherms on what was then a tropical passive margin – think modern-day Florida and you probably have something about right, at least in terms of tectonics and water temperature. The air that far back would have been even more oxygen-poor than the Cambrian; in the Paleozoic, after the rise of molecular oxygen, atmospheric oxygen levels were thought to be half what they are today. These reefs are much older. The land was still lifeless, the atmosphere starved of oxygen, but the oceans held the first stirrings of life. Then came the rifting, pulling this passive margin apart, sinking it deep as the basin expanded and tore. Dark, iron-rich lava called diabase came up and pooled in the carbonate country rock, providing the only numerical age for the entire succession: 1.09 Ga. This is the Crystal Spring Formation.

Multiple shoaling cycles are recorded above it as the basin subsides, begins filling to the surface, and subsides again. The resistant beds that stand out are shallow-water carbonates, while the softer stone in between is deeper-water mud. Notice how the cycles are getting shorter upsection. We past a karst surface where the carbonate has been aerially exposed and silica has replaced the limestone; apparently, this is where the silicified remains of the first microbial life on land was found. The eroded karst surface marks the end of the Beck Springs Formation, and now we’re in no-man’s land.

Siliciclastic shoaling cycles. The section has been tilted so that younger sediments are to the left.

Sometime after the rocks were exposed, the sea returns but the warm-water carbonates do not. Nobody’s entirely sure why, but we end up climbing on fissile, sharp-edged sandstones for much of the rest of the succession. Carbonates weather to razor edges (a process called karstification) so they’re terrible to climb around on, but I’m not sure these are better:
I spent much of my time at this succession chasing undergrad students with band-aids.


900 million years before present – Ice

Atop the Beck Springs Dolomite and the unnamed siliciclastic succession lie rocks generated in cold, glacial waters. Back at this morning’s stop we saw them exposed as a glacial diamictite, a jumbled mess of mud and cobbles and pebbles that showed the striations of grinding by ice. Here the same formation shows its glacial colors in the form of dropstones – boulders and cobbles dropped by glaciers into deep-water sediments as they calve off and melt. But this is no ordinary diamictite. It’s red.
What you are looking at now is one of the last of Earth’s banded iron formations – enormous deposits of oxidized iron laid down as ocean beds. In the modern-day ocean iron is scarce (it’s actually a limiting resource for phytoplankton), and the scarcity is related to the oxygenated water and atmosphere. In the presence of molecular oxygen, iron oxidizes and becomes solid, precipitating out of the water. Reducing conditions are necessary to keep iron in solution in seawater, but how do you keep this much iron out of reach of the atmosphere?

Cap it with ice, or so the theory goes. The glacial sediments we saw elsewhere as a diamictite record one of the last of the great Neoproterozoic glacial episodes, which some scientists (such as Paul Hoffmann) think represent a glacial advance that covered the entire planet, all the way up to the equator.  Paleomagnetic data does indicate that the continent was in the lower latitudes when it was freezing over, but that doesn’t necessarily mean the entire planet was frozen. After all, once the entire Earth is frozen over there is no way to break the positive feedback loop of increasing albedo and falling temperature and force back the ice – yet somehow it must have retreated, or else this planet would to this day resemble Europa, the frozen ocean moon of Jupiter.  At any rate, the banded iron formations represent the glacial retreat and exposure of the waters to the atmosphere; elsewhere, similar retreats are marked by thick dolomite horizons, known as cap carbonates. This one has one too, called the Noonday Dolomite.


800 million years before present – Fire

Even if you haven’t frozen the world solid, how do you beat back glaciers that have covered most of the rest of the planet in ice? Carbon dioxide would still be outgassing from the planet, but it’s actually a fairly weak greenhouse gas compared to others present in Earth’s atmosphere. Water vapor is stronger and represents a significant amount of heat capture in the modern atmosphere, but freezing temperatures plunge the carrying capacity of air down too low to hold a significant amount of this natural greenhouse gas. But we have another, much more powerful source of greenhouse emissions locked up in the depths of Earth’s oceans. Methane clathrates are molecules of methane caged in special crystals of ice.  They lie buried in Earth’s ocean sediments, a pool of natural carbon larger than the entire biomass and all the fossil fuel emissions on Earth combined – set the entire living world on fire and you still won’t release enough carbon to match the methane hydrate pool. Methane is also 27 times more effective an atmospheric greenhouse gas than is carbon dioxide. The clathrates are metastable at modern-day deep ocean conditions, balanced on a razor’s edge of cold temperatures and high pressure, and destabilizing any of this pool is liable to bring about a positive feedback that cannot be stopped. More methane release warms the planet more, which makes remaining hydrates unstable. A world that was once flash-frozen becomes a furnace, and the ice retreats. That’s what Martin Kennedy works on, and the methane in the oceans is probably what this was growing on:

That entire little peak at the center of the image is a single stromatolite. Or rather, it’s one of them; it’s one of the odd bioherms from the Noonday Dolomite, a cap carbonate for the Kingston Peak succession that shows evidence of methane release. There are multiple bioherms growing up on the Noonday platform, but these are growing down in a deep-water succession of black, organic-rich clays, well below the reach of sunlight. These probably weren’t built by cyanobacteria (as they are thought to have grown in water to deep for sunlight to penetrate) but may instead represent methanotrophic organisms, the inhabitants of ancient cold seeps. The organic nature of the rock becomes clearer on closer examination, despite the unusual weathering that makes the surface of the rock appear to run like wax.


Modern Day – Ice

We think of our modern climate as warm and equable, but we live in the midst of an ice age. The surface of our planet is shaped in a large part by the large-scale continental ice sheets that dominate our poles. Ice creates a strong thermal gradient, equator-to-pole, that gives the wind its strength and creates the jet stream that brings storms to the temperate regions. The formation of sea ice generates the subfreezing water that stirs and ventilates the deep seas. Our human society has built itself up based on the climate of the interglacial Holocene, a world balanced on the edge of glacial ice and greenhouse warmth; but if these ancient sediments are indicators of anything, it is that such climates are themselves intrinsically unstable. The center cannot hold, and the warmth – or cold, in our case – can not and does not last. Hothouse and icehouse, glacial advance and methane release, cycling over and over through Phanerozoic time.

Our world will end in fire someday, billions of years from now when the sun becomes unstable. In between it will shift forever between the extremes, fire and ice, greenhouse and icehouse – no vestige of a beginning, no prospect of an end.

The Winter Ocean

This is a bit of an odd piece.  It’s simultaneously a highly personal piece about the experience of depression and an explanation of seasons in the temperate coastal ocean, framed by the geology of the local Del Mar and Torrey formations, which form the backbone of the described beach. 

I’m including it partly because of that and also because depression is both horrifyingly common in our society and yet still poorly understood.  It’s hard to understand from the outside (unless you’ve been there before) just how the world distorts itself for the depressed person, leading to the all-too-common idea that they’re just feeling down rather than the gray loss of all emotion that a true depressive is likely to feel. 

More recent research has found that depression itself can literally reshape the brain as well as twist one’s experience of reality, illustrating that biology is not as reductionist as we’d like to think and that it is not in fact only genes and molecules, but interactions with the environment as well.  The human brain is fortunately fairly plastic, so much of this damage can be repaired through therapy – but it is never really “fixed” so much as controlled, much like other, more obviously physical illnesses like diabetes or hypothyroid.

This piece dates back to January 2007, when I had just finished my Master’s degree and was in the middle of having the total nervous breakdown I’d been staving off for the latter half of my graduate school career.


It’s New Year’s Day in Southern California, bright and sunny and clear and cold, and to top it off I’m standing on a beach a few miles north of San Diego, being buffeted by a remorseless ocean wind.

The beach looks different than just about any other time I’ve been; the parking lot is closed off, and it’s difficult to tell if it’s started to erode after they began trying to renovate it, or before. The beach carries the hallmarks of winter storms: shells and other debris left high on a beach made primarily of cobbles. While gentle summer waves push sand onshore, harsh winter waves drag it back offshore, leaving a jagged beach of very different character. Sand dragged offshore exposes tidal channels carved into the soft grey claystones of the Del Mar formation – longitudinal bars carved by the endless push-pull of the tidal current. The tide is currently low, and the others are heading across the slippery rocks to access the tidepools. The ocean will be coming in soon, so I follow the others out.

The Solana Beach tidepools are an interesting anomaly – not to say that tidepools are uncommon, and they do tend to form in soft sandstones and claystones such as these. However, the rocks exposed here are fossiliferous. Nut-shaped Eocene oysters stand out in contrast to the gnarled Recent specimens clinging on top of them, and burrowing mussels dig into the claystones and fossil shells. Tumbled blocks of Torrey Sandstone provide hiding places for brittle stars and octopus on their lower surface, while their upper surface is decorated with the winding burrows called Thalassinoides, standing out in smooth relief and oxidized a rusty red. Farther out both formations are covered with too much sea life and too much seaweed to really make out the fossils, as competition is fierce for hard surfaces to encrust. Were the summer beach sands to bury the rocks for more than a season, should sediments come down the rivers in sufficient quantity to bury the coast and to lithify, the eroded surface of the Del Mar and Torrey formations would create a picture-perfect disconformity: rocks that remain horizontal, but are missing approximately 33 million years’ worth of time.

The ocean is blue-grey and has been lashed by the same storms that stripped the sand from the beach. Out there there’s nothing to erode, but the falling temperatures at the surface have reduced the density differences in the water column. Where the summer ocean is layered, with warm sunlit water floating atop the cold deep water like an oil slick, the winter ocean is cold from top to bottom and much easier to stir. Deep and shallow waters mix, and dissolved nutrients from the depths replenish the depleted stocks at the surface. Spring and summer plankton lie dormant in the surface waters, and the eggs of last year’s fish and copepods drift. There’s plenty of drifting life in the ocean to feed the riot of mouths waiting at the tidepools and rocky reefs closer to shore, but it isn’t quite like spring and summer when the coastal waters explode in the green and gold of diatoms and dinoflagellates. The effect is more like a winter field lying fallow, waiting for the warmth of spring.

I point out a few fossils here and there (force of habit). I point out the cross-bedding exposed in the sandy cliffs where beach currents once pushed ripples across a shallow seafloor, oxidized a blood-red in the orange cliff wall. The blibs and blebs in the Del Mar claystones that are burrows, if you erode the sediment down to cut through them at odd angles. Things I’ve been shown before, had explained to me, was taught what to say by real geologists, real paleontologists. I don’t trust myself enough anymore to identify rocks on my own, since training in field identification and other such staples of the field were somewhat lacking in my education (there’s only so much time in the day, or in the three years alotted for a Master’s degree). Explainations about the living animals are easier, since I had a full undergraduate education in biology – but most of it was at a smaller scale, animals cut in cross section and placed on a glass slide, or soaked in ethanol until they turned pastel colors. Study of the living web of the tidepools would have mostly been the purview of a different department, the next floor up at my alma mater. Very few people in my department studied animals in the whole. Most of my education of macrobiology was the 101-type classes, the ones with over a hundred students, the ones that we had to get out of the way to gain access to the real classes. A glance at the biology research listings at UCR reveals a similar pattern: life cut down the the quick and studied at the smallest scales.

Sometimes I remember why I fled the field of biology.

Unfortunately, doing so seems to have landed me a degree in a field I’m trained pretty poorly in. I’m still not sure what to do with either skill set, as they seem to be pretty mutually exclusive: trained on the one hand for soft-rock geology (field mapping – sedimentary geology; stratigraphy; quantitative biostratigraphy) and on the other for molecular and subcellular biology (molecular and genetic lab techniques; transmission electron microscopy; light microscopy). Supposedly with a Master’s Degree I’m more employable than I would have been even with a PhD, but it doesn’t feel like it; tell the truth, I’m looking back at what I was originally taught to do over the last several years and getting the sort of feeling one gets when they graduate with a degree in Underwater Basket Weaving. Namely – the hell am I supposed to do with this?

But I suppose it doesn’t matter at the moment. All I’ve wanted to do for the last year is to hide, to give up, to let go – but I’m too stubborn for that, for starters, plus I tend to have an overdeveloped sense of obligation. So I finished, and it doesn’t feel like an accomplishment, or even like an ending. Just a sudden cessation, brittle as ice. And now that I’ve had the chance, all I’ve done is hide away from the world, curled up in shame, and wanting to forget that either the past or the future exists. Tired of worrying or caring about either.

Blank as the winter ocean.

Waiting for the sun.

Green Planet

Green planet began life as a post I was going to put up on Suburbivore to talk something about the science of food production, specifically soils and how plants evolved.  However, once it was finished it didn’t fit the blog topic, and I didn’t think I could make it fit without monkeying around with it until it was about something very different.  As a result it ended up languishing on my hard drive for a while before finding its way here.

I’ve taught introductory geology courses before, and this was always one of my favorite parts of the program, where I tie together what I know about planetary astronomy and how rocky planets develop with the history of life on Earth to explain why Earth is such an anomaly in the Solar System.  Sometimes I wonder if I’d stop seeing so many claims that the Earth was made for man (which drive me bananas) if more people understood how much Earth is both like and unlike other rocky planets we’ve observed, and why.


It is a peculiar chauvinism of our species that we named our planet “Earth” when, by all rights, we probably should have named it “Ocean.” This oddity has been noted in the past by better writers than I , where they comment on the fact that 70% of our planet is covered by water and only about 30% is available as dry land.  I would go a step further and argue that our world should perhaps most rightfully been named “Life” – for the world as we know it would not be possible without life, and would indeed be a very alien place to those of us used to the modern green and blue Earth.

However, it wasn’t animal life that most changed the world into the one we have now.  We are most emotionally invested in the forms life most like ourselves, and we therefore pay the most attention to warm-blooded animals, particularly large ones.  This homeothermic chauvinism can be seen, for example, by the very different levels of outrage over the wearing of fur versus the use of insecticides.  In general, if we are averse to the poison, it is not for the sake of the insects but because it affects other mammals or birds (if not ourselves!).  But while insects are alien and “other” to us, plants represent a step still further away on the tree of life, often viewed more as a form of living scenery than as organisms in their own right.  If we deign to notice plants, it is in their usefulness to us – the food they produce that we can eat; the aesthetic value of the leaves and flowers they bear; or the spiritual calmness of the forests they create, sheltered under towering trees and spreading leaves.  Bacteria and archaea, if they impinge on our consciousness at all, are swept into the catch-all category of “germs” and become things to be annihilated with the increasingly omnipresent triclosan and hand sanitizers.

But plants are more than just food factories and living carpets for our lawns, and the bacteria and archaea – both kingdoms in their own right – are more than just the seeds of disease.  Together they created the very air we breathe, and the earth beneath our feet.

Part One: Prologue

Our world was born without an atmosphere nearly 5.6 billion years ago, for as a small planet Earth does not have the gravitational grip to hold onto the light gases that were most common in the vortex of gases available as the solar system formed.  Only larger planets could retain these early, primary atmospheres of hydrogen and helium, so the outer giant planets alone held onto them, growing large enough to keep even flighty hydrogen from escaping due to the cooler temperatures present farther away from the nascent Sun.

We acquired an atmosphere later, after the planet had cooled from an initial molten state driven by constant impacts with the dust and debris left behind from early planetary formation.  Now a different type of impact introduced the materials that the great planets of the outer solar system had used to grow so large: water, methane, ethane, and carbon dioxide, the inorganic and organic ices that could only solidify in the cold dark of  the outer solar system, far from the Sun.  Additional gases were released from their mineral prison in the interior of the Earth as began to experience volcanic activity with a heat and violence unmatched by any modern natural disaster.  From these starting materials were born our primordial oceans and a secondary atmosphere wholly alien to us today, but actually more characteristic of small rocky planets of our type.  The dominant gases would have been carbon dioxide, nitrogen, and argon (about 95%, 3%, and 2% respectively, based on the current atmosphere of Venus and Mars1), with other gases making up tiny fractions of the remainder.  Oxygen is present in the atmospheres of both of these planets, and would likely have also have been present as part of Earth’s primordial atmosphere.  There is not much, however, and it is likely that any oxygen available close to the surface would probably have been rapidly consumed by rusting minerals exposed on the rocky surface, like the interactions that produced the red surface of Mars1.

Oxygen is not produced in great quantities through normal planetary processes like those described above; it takes life to do that, and life is much older on our planet than we are used to normally thinking.  There are some possible hints (quite controversial) that life arose 5 billion years ago2, but life was definitively present by at least 3.5 billion years ago as tiny, bacterial things1.  It then proceeded to spend the next two billion years doing nothing terribly interesting, at least based on the fossil record.

The problem, of course, is that a bacteria is a bacteria is a bacteria, and they have very strong selective pressures to stay small and morphologically similar to each other2.  Internally, of course, they are more free to diversify and have done so: bacteria and their distant cousins the archaea, ancient ancestors of our own multicelluar life, have developed incredibly diverse strategies for surviving and producing energy from the environment.  They live in the scalding heat of geothermal pools, the freezing interstices between granules of glacial ice, and can generate energy from sulfur and iron.  One group of them long ago seems to have developed a method for generating energy by using the energy of sunlight to split water, and it is this group that would transform the world: the cyanobacteria or “blue-green algae”, the descendents of which are present in the cells of every green living thing.  Photosynthesis evolved only once on our planet, and it was the cyanobacteria that managed to do it2.

Part Two: Air

Some 2.4 billion years ago, give or take a few million (it is difficult to determine exact dates in rocks so old), Earth’s atmosphere began to change to more closely resemble our modern one in what is now referred to as the Great Oxygenation Event.  Levels of carbon dioxide fell, leaving nitrogen behind as the most common element in our atmosphere, as it is today.  Oxygen levels rose.  Cyanobacteria are an old group, and biomarkers that indicate their presence were found in rocks that predate this event, some 2.71 billion years ago6.  So what changed?

Here is where the narrative gets fuzzy, in no small part because it is difficult to exactly tell the ages of rocks and correlate them across continents in the absence of distinctive and recognizable fossils (fossils are present in such rocks, of course; but as I said before, most bacteria tend to look very much alike).  The current going theory is that large-scale glaciations spread multiple times across the early Earth, possibly reaching down to the equator, with the ice only driven back by the release of trapped methane gases from beneath the seafloor3,4.Even smaller-scale glaciations, however, could have been the key.  They would have scraped dust and sediment from the exposed continents and washed them into the sea, providing a means of burying the bodies of early cyanobacteria so that they  could not react with the oxygen they had produced in life to rot.  As more and more carbon was buried, less and less of it was exposed to the amounts of oxygen that the survivors were producing to generate their food, and so more of it was free to build up in the atmosphere2.

This poisonous gas would have smothered most of the early life originally present on Earth, but bacteria are nothing if not resourceful (a generational span of minutes will do that) and some of them, the purple bacteria or proteobacteria, appear to have learned how to utilize this new toxic by-product in their own metabolism to help break down food.  Much as the cyanobacteria are the original progenitors of all chloroplasts, the tiny green parts inside plant cells that allow them to photosynthesize, the proteobacteria are the ancestors of our modern mitochondria, the tiny cellular machinery that forces us to breathe oxygen in order to break down our food for energy.  Ricksettia prowazekii, an obligate parasite from this portion of the bacterial family tree and the infectious agent behind typhus, is one of the closest living cousins to the tiny endosymbionts living in our cells5.

The buildup of oxygen is recorded in the rocks in a series of iron deposits known as banded iron formations (BIFs) found throughout the world and even today still mined as our primary source of iron ore.  They are remnants of great stores iron that were once dissolved in Earth’s oceans during its early anoxic years, most of them converting to an insoluble form and settling to the seafloor as oxygen built up during the great periods of glaciation that swept the early Earth6.  Our great railroads from the turn of the previous century, and the bodies of our cars even today, are built from the fossils of the turnover of our atmosphere.

Oxygen in our atmosphere had a second side-effect besides giving us sweet cars and transcontinental railroads, billions of years later.  Oxygen high in the atmosphere interacts with the ultraviolet radiation produced by our sun and present in sunlight, creating a layer of ozone that subsequently absorbs incoming UV radiation before it can reach the Earth’s surface.  Life could exist sheltered in the deep oceans because water absorbs UV radiation very quickly, protecting aquatic life and its DNA from the damaging energy of full sun exposure.  The development of an ozone layer would allow life to spread into shallow water and to emerge from the sea in time, to reshape the land as it had the sky2,7.

Part Three: Earth

We don’t give dirt a lot of thought despite having named our planet after it, but much like our atmosphere it’s actually quite unique in the solar system.  The surface of our moon provides a current example of what Earth’s early surface probably looked like before the advent of soils.  Igneous rocks would have formed from volcanic activity much as today, forming great solid sheets of magma, and impacting comets and asteroids would have blasted great craters out and let the dust and debris settle on the surface to form regolith, the pure inorganic sediment that makes up the surface of the moon and Mars.

Soil is quite different.  Regolith is only powdered rock of varying degrees of fineness, but soil contains regolith and more: the clays, sheetlike silicate minerals that only appear after the rise of the earliest land life8, and humus, an organic component made from decomposing plant or animal matter.  As the cyanobacteria began to conquer the land, sheltered inside the cells of multicellular plants, the types of chemical interactions required to produce both could finally occur.  Living plants or even simple cyanobacterial colonies produce organic acids that they excrete onto the surfaces that they live on, and it is thought that these are part of the chemistry required to convert igneous minerals into clays.  As these early plants died they would have broken down through the actions of the ever-present, ever-busy bacteria, leaving behind a carbon component in the sediment that would allow the formation of soils.  The structure of clays attracts organic acids to them and traps water, allowing such chemical interactions to continue underground as more plants die and more soil forms above them.

And so soils build up across the land over time, the speed at which they do determined by temperature, water availability, and the presence, ultimately, of life.  The formation of soils would later allow larger plants to grow, the great coal-measure swamps and their kind, moving ever farther from the water’s edges to conquer the sterile stone of the continental interiors, allowing the buildup of oxygen in the atmosphere to even well above modern levels.  Although these levels would ultimately fall at the close of the Permian, driving the greatest extinction ever seen on this planet1, the stage was set some 360 million years ago for the Earth as we know it today: green land, blue skies, and enough oxygen for a modern organism to breathe.

So remember this, as you tend your garden soil or water your houseplants: the world as we know it today is actually very unusual, and the plants that we care for are descendants of pioneers, the first terraformers, the life that took a plain rocky planet and reshaped it into a haven for – and ultimately built by – life.  While Earth was not made specifically for life, life made the modern Earth and, in doing so, fit itself to the changes it wrought on the planet in a positive feedback loop of change and adaptation.

They say Earth is truly a blue planet due to the extent of its oceans.  I say it is a green one due to the presence of, and the changes made by, life.


  1. Morrison, D. and T. Owen.  2003.  The Planetary System. 3rd edition.  San Francisco: Addison Wesley.
  2. Lane, N. 2009.  Life Ascending: The Ten Great Inventions of Evolution.  New York: W.W. Norton and Company.
  3. Hoffman, P.F. and D.P. Schrag.  2002.  “The snowball Earth hypothesis: testing the limits of global change.”  In: Terra Nova 14(3): 129-155.
  4. Kennedy, M.J., N. Christie-Blick and L.E. Sohl.  2001.  “Are Proterozoic cap carbonates and isotopic excursions a record of gas hydrate destabilization following Earth’s coldest intervals?”  In: Geology 29: 443-446.
  5. Gray, M.W.  1998.  “Ricksettia, typhus and the mitochondrial connection.”  In: Nature 396 (12 November 1998): 109-110.
  6. Basta, F.F., A. E. Maurice, L. Fontboté and P.-Y. Favarger.  2011.  “Petrology and geochemistry of the banded iron formation (BIF) of Wadi Karim and Um Anab, Eastern Desert, Egypt: Implications for the origin of Neoproterozoic BIF.”  In: Precambrian Research 187 (3-4): 277-292.
  7. Barley, M.E., A. Bekker, and B. Krapež.  2005.  Late Archean to Early Paleoproterozoic global tectonics, environmental change and the rise of atmospheric oxygen.  In: Earth and Planetary Science Letters 238(1-2): 156-171.
  8. 7. Berkner, L.V., and L.C. Marshall.  1965.  “On the Origin and Rise of Oxygen Concentration in Earth’s Atmosphere.”  In: Journal of Atmospheric Sciences 22: 225-261.
  9. Droser, M., M. Kennedy, L.M. Mayer, D. Mrofka and D. Pevear.  2006.  Late Precambrian Oxygenation: Inception of the Clay Mineral Factory.  In: Science 311: 1446-1449.

Ethnographic Fieldnotes: Jikoji Retreat

This fragment of writing represents in-the-field data collection (specifically, participant observation) or an anthropological paper on how Zen Buddhism has evolved in America.  I was curious how it managed to avoid the aura of otherness experienced by other religious minorities – Zen Buddhists in the Bay Area do not view themselves as outsiders any more than the surrounding society does, which was very puzzling to me since the practitioners are effectively atheistic in their religious traditions.  Despite this, the reactions that they garner from the public at large are very different from those who profess direct atheism or agnosticism.

It turns out that the way in which Zen was imported into the U.S. was key to its current standing in the culture, where it is viewed as an individual philosophy of living rather than a religion and thus is likely to attract followers from the more privileged end of society.

Jikoji Retreat is a beautiful Zen center located in the Santa Cruz mountains less than an hour’s drive from my house.  These observations date from February 2011, when an unusual cold snap had pulled the snowline down below 3,000 feet.


Jikoji Retreat was chosen in particular because its particular style of Buddhism (Soto Zen) is also seen in Hannah, my informant, and because this particular retreat welcomes visitors to its Sunday services.  It is located in the Santa Cruz Mountains along Skyline Boulevard (Highway 35) which, although not particularly far away from where I live, is rather difficult to access because of the nature of mountain roads.  With this in mind I left for services shortly before 9:00 AM, both to give myself extra travel time due to the mountain roads and also in case I became lost on the way – an idea that occurred to me more than once driving up Highway 9 into the mountains, since I had forgotten how dependent I had become these days on GPS receivers such as Garmin to navigate for me.

Jikoji is located off the entrance to public open space, and the road down to it is largely gravel and dirt.  Because of its location on the crest of the mountains the area is heavily forested with coast range broadleaf trees such as California bay, live oak, and madrone, all with their trunks coated with a thick layer of moss and (because it had been so cold lately) a dusting of snow.  I arrived early on a very cold morning and found a place to park off the main entry road, as far out of the path of traffic as possible, and took a look around.

I was fortunate to encounter one of the people who works at Jikoji, who showed me where the important service sites were and introduced me to the student teacher who was presenting the talk.  Since I had arrived some time beforehand, there was time to step inside the Zendo (after removing my shoes) and for her to show me how to properly sit zazen.  Normally they use a small round pillow (the zafu), which they sit on about 1/3 of the way to the edge, cross their legs to provide a platform or tripod for support, and hold their hands at stomach level with the thumbs touching and the fingertips resting on top of one another (to hold the “mudra,” although I am unclear what this means).  Unlike other meditation types I have experienced this is performed with the back straight so the ears are over the shoulders and with the eyes open, tilted down at a 45-degree angle with the chin tucked slightly in.  I am told this is to maintain the link between the inner and outer self, although in my experience it also provides a benefit in preventing me from falling asleep as I have done in other meditative attempts.

Incense and candles are lit in front of a statue of the Buddha at one end of the room, a bell is rung three times, and then we sit facing the wall on the pillows and meditate for 40 minutes.  Since the topic of meditation seems to be personal, there is no predetermined topic for meditation – the student instructor mostly told me to attempt to step outside of my own thoughts, and let them go.  Because I was unclear what to meditate on (and I have difficulty meditating to begin with) I mostly focused on the sounds of the birds outside – the screeching of scrub jays, the deep caw of a crow, and the call, somewhere distant, of a raptor.  To get my mind to silence I focused on the image of a bay nut, picked up from the ground outside as I looked around, somewhat lost, on my initial arrival, with its thin shell crumbling off to expose the nut within.  While the plant community around Skyline is likely not its original climax community, it is still as close to nature as one gets around here, and so this is what I meditated on primarily.  Although I still experienced severe difficulty maintaining inner quiet, I did experience in this meditative state the form of general feeling of wellness and calm that I occasionally feel just before falling asleep or during heavy periods of intense data entry, some of the few times my mind clears much at all.  This is likely similar to the meditative state that humans once experienced when our sleep schedules were not affected by artificial light, when we would sleep four hours and wake up for an hour or two of quiet restfulness and reflection before sleeping again, a pattern known as segmented or biphasic sleep. The lull sensation continued after the initial zazen period when we perform a chant while sitting, the text of which is provided below:

Dai-sai geda pu-ku

                Muso fuku den-e

                Hi-bu nyori kyo

                Ko-do shoshu jo


                How great is the kesa

                A virtuous garden far beyond form and emptiness

                I will wear the Tatagata’s teaching

                And save all sentient beings


                 Dai-sai geda pu-ku

                Muso fuku den-e

                Hi-bu nyori kyo

                Ko-do shoshu jo

This is followed by standing and facing the altar as the student teacher re-lights the incense and then we perform three full bows from a standing position – that is, a prone position with knees flexed under the body and head on the floor resting between the hands, elbows tucked in to the sides.  After this first period of zazen is the kinhin, or walking meditation, where everyone in the zendo forms a line around the edges of the room and walks, slowly, with hands folded or in a praying position in front of them, for ten minutes unti the bell is rung again.  After this first period we returned to the zazen position to continue meditation for another forty minutes.

Although the feeling of reflective well-being continued through the kinhin and the first part of the second zazen, by the end of it I felt about ready to explode from attempting to be so still for so long and to attempt to clear my mind (a common issue I have with meditation, and the main reason I typically avoid it).  However, this period seemed to last less time than the first period of zazen, or perhaps I simply wasn’t being as good at blanking out my thoughts.  At any rate, the ringing of the bell and the monotone repeat of the chant provided a respite from my restlessness and we took a brief ten-minute break to walk outside, talk, or in my case to stay sitting on the floor (but off the zafu pillow, which by now was becoming intensely uncomfortable).

The service itself was a discussion on the need to practice mindfulness in everyday life, presented both with examples drawn from the sutras as well as more psychological language – i.e. the repetition on the wheel of life (a paper model of which was passed around) is likened to our psychological need to repeat certain actions in our life, particularly destructive ones, and learning to let go of this is couched almost in self-help terms as well as in terms of the ideals of Buddhism.  This was also seen in the idea of performing inquiry meditation, wherein the period of zazen is spent first allowing the mind to settle and rest, and then looking into one’s past to see where these patterns of repetition of destructive behavior are seen.  The idea is to lose the illusion of self as separate from the rest of the world, but to do so one has to not only learn to let go of material or immaterial things (dislike, pride, hubris, materialism) but also to not only love all living things, but also turn the love and kindness that is espoused by the teachings to one’s own self.  I noted that the guest teacher frequently was looking at me as she said this, most likely because she knew I was new, but also perhaps because I was one of the few people with their eyes open and watching her during the service.

Service is presented with all participants sitting on the floor, many on the zafu pillows but in my case and a few others simply sitting on the mats used for meditation.  We begin by standing, then reading the sutra presented to us on pre-printed paper as a low, monotone chant.  This time around the sutra appeared to be focused on the ideal of extending love to all living things and invoked the name of Avalokitesvara (or Kwan Seum Bosal/Kwan Yin, the bodhisattva of compassion).  Once the reading is done we perform the deep bow another three times and then sit, this time with everyone facing away from the wall and towards the center of the zendo.  We read another chant at the beginning of the service, a final chant at the end of the service, and then repeated the Four Vows:

Sentient beings are numberless, I vow to liberate them

                Desires are inexhaustible, I vow to put an end to them

                The Dharmas are boundless, I vow to master them

                The Buddha’s Way is Unsurpassable, I vow to become it.

The guest teacher was dressed in traditional Zen monk robes, black on the outside with a white inner collar (perhaps undergarments as well) and with a brown cloth draped around the body and hung around the left shoulder.  The teacher was barefoot, also typical of monks, but she was neither male nor had the shaved head often seen as traditional; however, she also was white, as were most of the participants besides me and one other person (who perhaps was of Middle Eastern descent).  Participants ranged in age from perhaps their late 20s to their 50s (a rough estimate based on visual observation).  I also noted items that I typically only see displayed by higher social classes: Gore-tex jackets against the cold, reusable plastic or steel Nalgene water bottles, the wool socks usually sold at REI to be worn in hiking boots.  There also was a specific sort of bib or neck item worn by some of the participants, dark blue cloth with a white square in front, often with writing on it, which they tucked their hands under during kinhin.  I am unclear as to the purpose of this item although it is apparently quite sacred, since during lunch one of the other participants turned it backwards and explained that to clean the item, it would need to be spot-washed by hand while burning cedar incense.

The talk portion of the service was particularly of interest, for here the other participants asked questions regarding the service, but the atmosphere was much more relaxed.  Particularly near the end, it gave way to friendly joking both on the part of the participants and the student teacher.  This ended at about 12:30, when after some difficult to answer questions the teacher laughed, pointed at her watch, and said it was time for lunch!

The social lunch that was provided in the small side kitchen was typical American fare, albeit vegetarian: wheat (gluten-free?) rigatoni with a marinara sauce, garlic bread, salad, and apple pies that some of the participants had brought for dessert.  During this period I explained more of what I was doing there during my visit, and listened to the other participants as they talked with one another.  Notably, this is when I discovered what some of them did: one works for Oracle, another works for Apple, and notably neither seem to be especially happy with their job.  For them, it sounds as if the meditative services are their escape, particularly now that the economy has made leaving unhappy jobs a much more dangerous affair.  Two appear to be doing stand-up comedy on the side, one is a musician for a hobby, and it is unclear what all of the others do as I could not track all of the side conversations going on with approximately twelve people in a very small kitchen.

After lunch the group broke up to help push a car back onto the road that had slid off just prior to service, and people started moving back into their cars to head home.  By this point the temperature had warmed slightly and much of the remaining snow had melted off, although the air still had the acrid smell of snow to it, and the brick stairway that I climbed to get back to my car was still slippery with ice.