Lower Permian Owens Valley Group

Inyo County, California

A natural cross-section of a silicified Stewartina sp. fusulinid from the Lower Permian Owens Valley Group, Inyo County, California; an iron mineral called limonite has created the reddish-brown coloration of the specimen, which here reveals in splendid fashion the fascinating system of geometrically intricate internal structures the extinct single-celled animal created during its life cycle.

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