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

When both sides are shown

A bound edition of Volume 5

Because fulgurites are amorphous

with the black looking just like weathered obsidian

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