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What type of rock is the Beaver Street Wall?

Last updated May 21, 2020 by ZagBot Comment

The Beaver Street Wall is a radiolarian chert, a hard sedimentary rock comprising fine silica crystals originating from the shells of radiolaria, tiny ocean-dwelling plankton, that settled to the sea floor millions of years ago.

Large areas of the rock appear smooth and shiny, a feature known as a slickenside, which suggests that the rock sat on one side of a geological fault line. Sliding against rock on the other side of the fault over many years has left a polished, glassy surface in places.

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Beaver Street Wall, 181 Beaver Street
San Francisco
California
94143
United States

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