See the review for Annals of the Former World for the beginning of this review.
My last thought for the book is the idea that as the North American Continent is spreading apart in the Basin and Range (from Salt Lake City to Reno which are spreading about 1 inch every ten years, and dipping into Mexico), it will open an ocean. “The Red Sea of today was what the Atlantic and its two sides had looked like about twenty million years after the Atlantic began to open. The Red Sea today was what the Basin and Range would probably look like at some time in the future.” Geologist use their knowledge and instinct, or gut feelings to theorize where exactly the ocean will open up, either the Great Salt Lake’s ancestral Lake Bonneville in Utah, or like a zipper from the Gulf of California, or from the Cape Mendocino fault line in Northern California from the Pacific.
“The geologist Kenneth Deffeyes places his hands on the map so that they frame the Garlock and Mendocino faults and hold between them a large piece of California—from Bakersfield to Redding, roughly, and including San Francisco, Sacramento, and Fresno—not to mention the whole of the High Sierra, Reno, and ten million acres of Nevada.” Under water. A new ocean. My idea of heaven is knowing if any of this conjecture is right. Of being able to see what happens.
Exactly like Annie Dillard writes: “Last year I had a very unusual experience. I was awake, with my eyes closed, when I had a dream. It was a small dream about time. I was dead, I guess, in deep black space high up among many white stars. My own consciousness had been disclosed to me, and I was happy. Then I saw far below me a long, curved band of color. As I came closer, I saw that it stretched endlessly in either direction, and I understood that I was seeing all the time of the planet where I had lived. It looked like a woman's tweed scarf; the longer I studied any one spot, the more dots of color I saw. There was no end to the deepness and variety of the dots. At length, I started to look for my time, but, although more and more specks of color and deeper and more intricate textures appeared in the fabric, I couldn't find my time, or any time at all that I recognized as being near my time. I couldn't make out so much as a pyramid. Yet as I looked at the band of time, all the individual people, I understood with special clarity, were living at the very moment with great emotion, in intricate detail, in their individual times and places, and they were dying and being replaced by ever more people, one by one, like stitches in which whole worlds of feeling and energy were wrapped, in a never-ending cloth. I remembered suddenly the color and texture of our life as we knew it- these things had been utterly forgotten- and I thought as I searched for it on the limitless band, ‘that was a good time then, a good time to be living.’ And I began to remember our time. I recalled green fields with carrots growing, one by one, in slender rows. Cells on the root hairs of sycamores split and divided and apples grew striped and spotted in the fall. Mountains kept their cool caves, and squirrels raced home to their nests through sunlight and shade. I remembered the ocean, and I seemed to be in the ocean myself, swimming over orange crabs that looked like coral, or off the deep Atlantic banks where whitefish school. Or again I saw the tops of poplars, and the whole sky brushed with clouds in pallid streaks, under which wilds ducks flew, and called, one by one, and flew on. All these things I saw. Scenes grew in depth and sunlit detail before my eyes, and were replaced by ever more scenes, as I remembered the life of my time with increasing feeling. At last I saw the earth as a globe in space, and I recalled the ocean's shape and the form of continents, saying to myself with surprise as I looked at the planet, Yes, that's how it was then, that part there we called ‘France’ I was filled with the deep affection of nostalgia- and then I opened my eyes.”
Other interesting thoughts, topics, teasers:
Solid-earth tides could break it up, too. The sea is not all that responds to the moon. Twice a day the solid earth bobs up and down, as much as a foot. That kind of force and that kind of distance are more than enough to break hard rock. Wells will flow faster during lunar high tides.
The country rock was a shale, which had earlier been the deep muck of some Triassic lake, where the labyrinthodont amphibians lived, and paleoniscid fish.
To them, the roadcut is a portal, a fragment of a regional story, a proscenium arch that leads their imaginations into the earth and through the surrounding terrane. The rock itself are the essential clues to the scenes in which the rock began to form—a lake in Wyoming, about as large as Huron; a shallow ocean reaching westward from Washington.
There’s a little bit of the humanities that creeps into geology, and that’s why I am in it. You can’t prove things as rigorously as physicists or chemists do.
To be sure, there is plenty of absorbing geology under the shag of eastern America, galvanic conundrums in Appalachian structure and intricate puzzles in history and stratigraphy.
The physiographic boundary is indistinct where you shade off the Allegheny Plateau and onto the stable craton, the continent’s enduring core, its heartland, immemorially unstrained, the steady, predictable hedreocraton—the Stable Interior Craton. There are old mountains to the east, maturing mountains to the west, adolescent mountains beyond.
The craton has participated on its edges in the violent creation of the mountains. But it remains intact within, and half a nationwide—the lasting, stolid craton, slowly, slowly downwasting. It has lost five centimetres since the birth of Christ.
Now with each westward township the country thickens, rises—a thousand, two thousand, five thousand feet—on crumbs shed off the Rockies and generously served to the craton. At last the Front Range comes to view—the chevroned mural of the mountains, sparkling white on gray, and on its outfanning sediments you are lifted into the Rockies and you plunge through a canyon to the Laramie Plains.
Geologists communicated in English; and they could name things in a manner that sent shivers through the bones.
He explained that gold is not merely rare. It can be said to love itself. It is, with platinum, the noblest of the noble metals—those which resist combination with other elements. Gold wants to be free. In cool crust rock, it generally is free.
In the southern part of the province, in the Mojave, the ranges have stopped rising and are gradually wearing away. The Shadow Mountains. The Dead Mountains, Old Dad Mountains, Cowhole Mountains, Bullion, Mule, and Chocolate mountains. They are inselberge now, buried ever deeper in their own waste.
The ranges of the Basin and Range came up another way. The crust—in this region between the Rockies and the Sierra—is spreading out, being stretched, being thinned, being literally pulled to pieces. The sites of Reno and Salt Lake City, on opposite sides of the province, have moved apart sixty miles.The escarpment of the Wasatch Mountains—easternmost expression of this immense suite of mountains—faced west. The Sierra—the westernmost, the highest, the predominant range, with Donner Pass only halfway up it—presented its escarpment to the east.
For another example, the last Pleistocene ice sheet loaded two miles of ice onto Scotland, and that dunked Scotland in the mantle. After the ice melted, Scotland came up again, lifting its beaches into the air.
When the rock of this big Utah roadcut had been the limy bottom of the Ordovician sea, the water had been so shallow that the lime mud had occasionally been above the surface and had dried out and cracked into chips, and then the water rose and the chips became embedded in more lime mud, and the process happened again and again so that the limestone now is a self-containing breccia studded with imprisoned chips—an accident so lovely to the eye you want to slice the rock and frame it.
Growing barley on his farm in Berwickshire, James Hutton had perceived slow destruction watching streams carry soil to the sea. It occurred to him that if streams were to do that through enough time, there would be no land on which to farm. So there must be in the world a source of new soil. It would come from above—that was to say, from high terrain—and be made by rain and frost slowly reducing mountains, which in stages would be ground down from boulders to cobbles to pebbles to sand to silt to mud by a ridge-to-ocean system of dendritic streams.
Hutton had no way of knowing that there were seventy million years just in the line that separated the two kinds of rock, and many millions more in the story of each formation—but he sensed something like it, sensed the awesome truth, and as he stood there staring at the riverbank he was seeing it for all humankind.
What clearer evidence could we have had of the different formation of these rocks, and of the long interval which separated their formation, had we actually seen them emerging from the bosom of the deep? We felt ourselves necessarily carried back to the time when the schistus on which we stood was yet at the bottom of the sea, and when the sandstone before us was only beginning to be deposited, in the shape of sand or mud, from the waters of a superincumbent ocean.
Seeing a race unaware of its own instantaneousness in time, they can reel off all the species that have come and gone, with emphasis on those that have specialized themselves to death.
So by looking at the paleomagnetic compasses in rock you can tell not only whether the magnetic pole was in the north or south when the rock formed but also—from the more subtle positions of the needles—the latitude of the rock at the time it formed.”
On the striated pavement of Algeria lies the till of polar glaciers. There are tropical atolls in Canada, tropical limestones in Siberia, tropical limestones in Antarctica. From fossils, from climates preserved in stone, such facts were known long before paleomagnetism was discovered; but they were, to say the least, imperfectly understood.
The Himalaya is the crowning achievement of the Indo-Australian Plate. India, in the Oligocene, crashed head on into Tibet, hit so hard that it not only folded and buckled the plate boundaries but also plowed in under the newly created Tibetan Plateau and drove the Himalaya five and a half miles into the sky. Their height and volume are already so great they are beginning to melt in their own self-generated radioactive heat. When the climbers in 1953 planted their flags on the highest mountain, they set them in snow over the skeletons of creatures that had lived in the warm clear ocean that India, moving north, blanked out. Possibly as much as twenty thousand feet below the seafloor, the skeletal remains had formed into rock.
The California Coast Ranges—the hills of Vallejo, the hills of San Simeon, the hills of San Francisco —are a kind of berm that was pushed up out of the water by the incoming plate, including large slices of the seafloor and a jumble of oceanic and continental materials known to geologists as the Franciscan mélange.
The huge body of sediment would one day be lifted far above sea level and dissected by weather and wrinkled into mountains in the way that the skin of an apple wrinkles as the apple grows old and dry.
In the nineteen-forties, a professor at Delft had written a book called The Pulse of the Earth, in which he asserted with mild cynicism that where gaps exist among the facts of geology the space between is often filled with things “geopoetical,” and now Hess, with good-humored candor, adopted the term and announced in his first paragraph that while he meant “not to travel any further into the realm of fantasy than is absolutely necessary,” he nonetheless looked upon what he was about to present as “an essay in geopoetry.”
“The whole ocean is virtually swept clean (replaced by new mantle material) every three hundred to four hundred million years,” he wrote, not then suspecting that ocean crust is actually consumed in half that time.
Where is the suture in California?’ of course, that there were at least three sutures. In each instance, a great island had closed up a sea and hit into America—just as India hit Tibet, just as Kodiak Island, which is a mini-India, is about to plow into Alaska. Fossils from the mid-Pacific have been found here in the West, and limestones that lithified a thousand miles south of the equator. Formations in California have alien fossils with cousins in the rock of New Guinea.
As a result, the style of geology is full of inferences, and they change. No one has ever seen a geosyncline. No one has ever seen the welding of tuff. No one has ever seen a granite batholith intrude.