Roadcut of the Antelope Valley Freeway Photograph of sever | Geology of the world and the Environment
Roadcut of the Antelope Valley Freeway
Photograph of severely deformed sedimentary rock layers exposed in a roadcut of the Antelope Valley Freeway (Interstate Highway 19) within the San Andreas Fault zone near Palmdale, California; view is about 100 m wide (note light stanchion for scale). The sedimentary rocks originally were deposited as horizontal layers of sand and mud in streams and ponds that occupied a late Miocene landscape (about 15 to 9 million years ago). Squeezing related to movements within the San Andreas Fault zone caused the horizontal layers to be contorted into the folds visible in the roadcut, and even created a small fault that has broken one of the folds. These relations show nicely how geologic materials deform (strain) in response to dynamic earth forces (stress).
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