Treptichnus pedum Trace Fossils

Lower Cambrian Portion of the Deep Spring Formation

Inyo County, California

Treptichnus pedum trace fossils from lower Cambrian portion of the upper Deep Spring Formation, Inyo County, California; feeding trails that resemble types made by modern priapulid worms. Such Treptichnus pedum trails begin to appear worldwide in strata deposited at the Precambrian-Cambrian boundary; stratigraphers use them to mark the precise moment in geologic time when the Paleozoic Era began--541 million years ago. Photograph from a specific scientific publication.

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