Not Just About Rocks

Zion National Park

Zion National Park

Geology is one of those subjects I would like to know much more about. Although I took the subject in college during late Ordovician times, it was all dictated by synclines, geosynclines, and anticlines, which I never quite understood—nor did the geologists who promulgated the notion.

Living as I do in the American Southwest, where the rocks are not covered by all that dirt, geology is something that seems more immediate. All the more so when the earth shakes as the tectonic plates are slowly marching on their pre-ordained paths to their next destination.

Geology is the history of what lies under our feet. It’s not just the study of rocks—though I can see where that could be interesting—but the study of long, slow processes that are changing the face of the earth. I saw some of those processes in action at Vatnajökull Glacier in Iceland, which has retreated hundreds of meters since the 1930s, when a road around the whole of the country was a laughable ides. Even now, the road across the black sands drained by the glacier is only a temporary expedient.

But then we are all temporary. If we want to see how small we are, we could make a study of the stars. But why go that far? The earth under our feet can be just as bizarre and alien. We talk about global warming as if it had never occurred before. It is just as likely that the currents of the oceans will reverse, bringing cold weather southward; and the glaciers may just start to re-form. We just don’t know.

I just finished reading John McPhee’s book In Suspect Terrain, about the forces that formed the eastern part of the United States, mostly the Appalachian Mountains. Plate tectonics explains some things, but as one geologist remarked, “While geologists argue, the rocks just sit there. And sometimes they seem to smile.”

This and the other titles in McPhee’s geological tetralogy, are good books to read if you want to puncture a few misconceptions.