Trilobites from the base of the type whiterockian (Middle Ordovician)in Nevada

From: Journal of Paleontology | Date: March 1, 1999| Author: | Copyright information

ABSTRACT-No trilobite species. and very few genera, pass from the Lower (Ibexian) into the Middle Ordovician (Whiterockian), which is a turning point in Laurentian trilobite history. Trilobites from three sections exposing the base of the Whiterock Series (basal Middle Ordovician) in Nevada are d escribed and illustrated. They are attributable to different, and generally more open-shelf, biofacies from the Bathyurid biofacies trilobites described from the Ibex area, Utah, by Fortey and Droser (1996), but include species in common, which allow correlation into the Ibexian type section. At ...

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