Patterned Cliff Face, Detail. © Copyright 2018 G Dan Mitchell – all rights reserved.

A small section of shaded Sierra Nevada cliff reveals remarkable details of dikes, fractures, color, and stains

Most often when I think of large rocky faces in the Sierra Nevada, the clean, smooth, and almost uniform faces of Yosemite granite come to mind — large expanses of nearly unbroken rock shaped by glaciers. However, when I get into the high country and the other areas of the range I am reminded that things aren’t quite so simple. In places you can find mountains cut through by giant dikes of non-granite rock, or you might encounter the remnants of more ancient layers that lay above the granite intrusions and today give us red, black and other colors of material.

Since I’m no geologist, I can’t explain the details of the face in this photograph, but I can share a few observations. It is the headwall of a high bowl that contains a subalpine lake, and the area does show signs of glaciation. The fact is gigantic, and this is just a small section. It is far from uniform, with mostly gray rock cut through by thick intrusions of lighter material, and the whole thing cracked and fractured. In many places the surface has been deeply stained as water has flowed or seeped across it.

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G Dan Mitchell is a California photographer and visual opportunist. His book, “California’s Fall Color: A Photographer’s Guide to Autumn in the Sierra” is available from Heyday Books and Amazon.
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