Lower Cambrian Poleta Formation

Esmeralda County, Nevada

A mostly complete archaeocyathid from the lower limestone member of the Lower Cambrian Poleta Formation, Esmeralda County, Nevada; archaeocyathids are an extinct variety of calcareous sponge that never made it beyond early Cambrian times roughly 510 million years ago. Genus Cambrocyathus. Photograph courtesy an anonymous individual.

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