Terminal Early Cambrian extinction of the Olenellina: Documentation from the Pioche Formation, Nevada

From: Journal of Paleontology | Date: July 1, 1998| Author: | Copyright information

ABSTRACT-The extinction of the Olenellina on Laurentia can be located within centimeters in the C-shale or uppermost Combined Metals Limestone members of the Pioche Formation in eastern Nevada. Olenellid species diversity beneath the extinction boundary is not diminished. One of the richest Laure ntian intervals for articulated olenellids is in the 50 centimeters of shale immediately below the extinction boundary at Ruin Wash. Additional morphological information about some of the species comes from a silicified fauna 1.8 m below the extinction boundary at Hidden Valley. The olenellid fauna ...

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