Fossil Algae

Structures created by algae. The roughly oval to circular nodules were precipitated by an extinct variety of blue-breen algae called Girvanella; these are from the middle to upper Cambrian Bonanza King Dolomite, as exposed in the vicinity of Mazourka Canyon, Inyo County, California. Note US penny for scale slightly right of center. Photograph is from a specific public domain document.

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