The range of Ogygopsis, a trilobite genus known principally from the Canadian Rocky Mountains where it occurs through most of the Middle Cambrian succession, is here extended downward to the upper part of the Lower Cambrian. In the Inyo Mountains, California, and in western Nevada, the genus is found in association with Olenellus and other Lower Cambrian forms.

GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States