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Phanerozoic-Cryptozoic and Related Transitions: New Evidence

Preston E. Cloud, C. A. Nelson

Abstract

The fossil Pteridinium, a distinctive component of a worldwide early metazoan (Ediacaran)assemblage, is provisionally recorded from probable early Cambrian strata in eastern California. In context with other evidence, this finding implies a Cambrian age for the Ediacaran fauna and approximate coincidence of limits between Phanerozoic-Cryptozoic, Paleozoic-Precambrian, and Cambrian-Precambrian.

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Key concepts: Precambrian, Phanerozoic, Paleozoic, Paleontology, Geology, Context (archaeology), Fauna, Cenozoic