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Slide 10: Other good indicators of a fault scarp are the presence of slickensides and fault gouge. Here we see some fault gouge on an exposed fault scarp at the mountain front on the salient. Fault gouge is produced by the grinding of rock with fault movement and by breakdown from solutions flowing through the fault cracks. It forms a very fine-grained cemented material along the fault plane, and is sometimes exposed before it weathers. Note also the deformation of the thin sedimentary layers in the cliff face, due to stresses of faulting. Credit: Courtesy Robert E. Ford, Westminster College of Salt Lake City, and Michael Hernandez, University of Utah. |
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