fault gouge, clay formed in the San Andreas fault zone, fault gouge - rock material ground to a fine clay. In this case, the col
fault gouge, clay formed in the San Andreas fault zone, fault gouge - rock material ground to a fine clay. In this case, the collision is between the Pacific Plate and the North American Plate. In the Mecca Hills in California the clay gouge has been squeezed up to form a linear ridge about 200 feet high. In the Mecca Hills, the rock on either side of the fault are for the most part sedimentary, but gouge just like this can form from igneous rocks as well, showing slickenside a smoothly polished surface caused by frictional movement between rocks along the two sides of a fault
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