peat - silty peat from the San Andreas fault zone, formed in a marsh that dried out roughly a century ago - large display specimen As described in 1925 by

As described in 1925 by mining engineer Carl Millikan

garnetiferous sand from Pfeiffer Beach

This medium-grained sandstone is composed primarily of quartz with feldspar and some biotite

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shown in the field photo

peat - silty peat from the San Andreas fault zone, formed in a marsh that dried out roughly a century ago - large display specimen As described in 1925 byThis silty peat was collected from a former marsh along Pallett Creek in the San Andreas fault zone, Los Angeles County, California Peat is formed by partial decomposition of plant material under acidic conditions. With burial and compression, peat forms lignite and eventually bituminous coal. At Pallett Creek, the peat was formed in a marshy sag pond in the fault zone. Layers of leaves and vegetation fell into the marsh and were subsequently covered