Earth: 7.5 Billion AD

Don’t forget “the distant future,” an article in New Scientist warns, referring to an era 7.5 billion years from now – when “the sun will loom 250 times larger in the sky than it is today, and it will scorch the Earth beyond recognition.”

That Earth, however, will be unrecognizable, geologically reconfigured into something called Pangaea Ultima: “Existing [subduction] zones on the western edge of the Atlantic ocean should seed a giant north-south rift that swallows heavy, old oceanic crust. The Atlantic will start to shrink, sending the Americas crashing back into the merged Euro-African continent. So roughly 250 million years from now, most of the world’s land mass will once again be joined together in a new supercontinent that [Christopher] Scotese and his colleagues [at U-Texas, Arlington] have dubbed Pangaea Ultima.”

[Images: Pangaea Ultima, or the Earth in 250 million years, from Christopher Scotese’s website. It’s interesting here to imagine where the cities of today might end up in this configuration, if Manhattan will collide, say, with the docklands of London, and what that new city would then be called – and could you set a novel in a space like that? You look out and see Manhattan coming toward you on the horizon, at the speed of a fingernail growing, and you take little rowboats out to visit it on long summer afternoons, that ghost city adrift on mantled currents of earthquake-laden rock. Or would it be possible for an architect – or two architects, on opposite sides of the ocean – to design, today, different buildings meant to merge in millions of years, to collide with each other and link into one building through plate tectonics, a kind of delayed, virtual, urban self-completion via continental drift… Cairo-Athens: an architectural puzzle assembled by the Earth’s own geological mechanisms].

After Pangaea Ultima, runaway greenhouse warming and a literally expanding sun will mean that everything “gets worse. In 1.2 billion years, the sun will be about 15 per cent brighter than it is today. The surface temperature on Earth will reach between 60 and 70°C and the… oceans will all but disappear, leaving vast dry salt flats, and the cogs and gears of Earth’s shifting continents will grind to a halt. Complex animal life will almost certainly have died out.”

Jeffrey Kargel, from the U.S. Geological Survey’s office in Flagstaff, Arizona, offers his own vision of planetwide erosion: “‘Imagine a steaming Mississippi river delta with 90 per cent of the water gone. There’ll be lots of sluggish streams and the whole Earth will be flattening out. All the mountains will be eroded down to their roots.’ Huge swathes of the Earth might resemble today’s deserts in Nevada and southern Arizona, with low, rugged mountains almost buried in their own rubble.”

Kargel believes that the Earth might even become “‘tidally locked’ to the sun. In other words, one side of the planet will be in permanent daylight while the other side will always be dark.”

The side of the planet always in the glare of triumphant Apollo will eventually consist of huge roiling seas of liquid rock – perhaps ready for the return of Coleridge’s Ancient Mariner. “7.57 billion years from now, the magma ocean directly in the glare of the sun will reach almost 2200°C. ‘At that kind of temperature, the magma will start to evaporate,’ (!) says Kargel.”

Meanwhile, “Kargel thinks the night side of the Earth could be… about -240°C. And this bizarre hot-and-cold Earth will set up some exotic weather patterns.”

[Image: “Exotic” future weather systems (from New Scientist); worth enlarging. We could thus anticipate a market in weather futures: the financial coupling of climatology and the global reinsurance industry, but, here, gone deep time and virtual].

“On the hot side, metals like silicon, magnesium and iron, and their oxides, will evaporate out of the magma sea. In the warm twilight zones, they’ll condense back down. ‘You’ll see iron rain, maybe silicon monoxide snow,’ says Kargel. Meanwhile potassium and sodium snow will fall from colder dusky skies.”

So it would seem possible, amidst all this, to figure out, for instance, the melting point of Manhattan, ie. the point at which rivers of liquid architecture will start flowing down from the terraces of uninhabited high-rise flats, when the top of the Chrysler Building, all but invisible behind superheated orange clouds of toxic greenhouse gases, will form a glistening silver stream of pure metal boiling down into the half-closed Atlantic Ocean.

If cities are viewed, in this instance, as geological deposits, then surely there would be a way to account for them in the equations of future geophysicists: all of London reduced to a pool of molten steel, swept by currents of gelatinous glass, as sedimentary rocks made of abraded marble, granite, and limestone form from compression in the lower depths. A new Thames of liquid windows, former walls.

Any account of a future Earth, in other words, melting under the glare of a red giant sun, should include the future of cities, where buildings become rivers and subways will fossilize.

All cities, we could say, are geology waiting to happen.

(See BLDGBLOG’s Urban fossil value for more).

Urban Fossil Value

[Image: J.M. Gandy, speculations toward the ruins of John Soane’s Bank of England – but, again, how about speculations toward the Bank of England’s fossils…?]

As Hurricane Rita carves away at the Gulf shore, Galveston burns, buses explode outside Houston, and New Orleans refloods through badly built and incompletely repaired levees, I stumbled upon an old article, from 1998, about fossilized cities.

Millions of years from now, in geographical regions “entombed by tectonic disturbances,” entire cities – “the abandoned foundations, subways, roads and pipelines of our ever more extensive urban stratum” – will actually come to form “future trace fossils.”

These “future trace fossils,” the article says, form easily preserved systems that are “a lot more robust than [fossils] of the dinosaurs. They include roads, houses and foundations.”

And yet, for all that, only those cities “that were rapidly buried by floods or sandstorms” will be “preserved for posterity.”

Los Angeles, for instance, “is on an upward trajectory, pushed by pressure from the adjacent San Andreas Fault system, and is doomed to be eroded away entirely.” But if a city is flooded, buried in sand, or otherwise absorbed downward, “the stage is set to produce ideal pickling jars for cities. The urban strata of Amsterdam, New Orleans, Cairo and Venice could be buried wholesale – providing, that is, they can get over one more hurdle: the destructive power of the sea.”

It is often remarked in architectural circles how megalomaniacal Nazi architect Albert Speer came up with his so-called theory of ruin value, in which he proposed a new Romano-Fascist Berlin designed to look good as a ruin in thousands of years.

But that’s boring – let’s talk about cities fossilizing over millions of years.

Urban fossil value.

The already buried, subterranean undersides of our Tube-hollowed, war-bunkered modern cities “will be hard to obliterate. They will be altered, to be sure, and it is fascinating to speculate about what will happen to our very own addition to nature’s store of rocks and minerals, given a hundred million years, a little heat, some pressure (the weight of a kilometre or two of overlying sediment) and the catalytic, corrosive effect of the underground fluids in which all of these structures will be bathed.”

Who knew, for instance, that plastics, “which are made of long chains of subunits, might behave like some of the long-chain organic molecules in fossil plant twigs and branches, or the collagen in the fossilized skeletons of some marine invertebrates”? Who knew, in other words, that plastics will fossilize?

Indeed, “with a favourable concatenation of tectonics and sea level, our species could leave behind in a geological instant a much more striking record than the dinosaurs left in a hundred million years.”

Urban rock walks, or: how to podcast a landscape

If you’ve ever wondered what the streets and buildings and monuments of the UK are constructed from, a good enough place to start is the BBC’s Walks with Rocks, where psychogeography meets paleontology meets continental drift. Paleo-psycho-ontogeography, perhaps. In any case, now you can learn the geological origins of paving stones, the density, formation pressures and tectonic ancestry of the architraves on that rockin’ bldg across the street from Boots.

For instance: ‘Looking at the foyer of Berkeley Square House we can see Norwegian igneous combined with Italian freshwater spring limestones. The adjacent Citroen and Rolls Royce showrooms tempt us with Tethyan limestone full of fossils. The Tethyan region was the seaway that lay to the South of the Eurasian Continent and to the North of Australia/India/Africa during the Late Paleozoic and Early Mesozoic periods’ – from Stop 7 on the Dover Street, W1, map.
While you’re at it, my televisual posts continue with British Isles: A Natural History on BBC One: ‘The series and inserts explore how over three billion years Britain has been boiled in lava, buried under tropical swamps and swept by desert sands. They show how it was crushed by enormous glaciers, released by warm winds, forested from north to south and how the influence of human life has dramatically changed the landscape.’ You can also ask what’s beneath your feet – no, it’s not sheepshit, it’s…
Then there are these audio recordings from the BBC’s new *Coast* show, which despite suffering from a rather alarming quantity of badly-accented historical reenactors offers one model for how to podcast a landscape.
Here’s a link to the first episode of the TV show, which, in combination with the second episode, traces out the following geography:

Finally, more Atlantis b.s. in the news, but I still think it’s cool: another tsunami theory, this one about Spartel Island (now submerged) in the Straits of Gibraltar: