1. Generalized geologic map of the southern Sierra Nevada, California, showing the location of basement samples for which whole rock 18/0 has been determined [cartographic material] Yale Public content 1983. 2002-06-01T04:00:00Z. 2023-08-08T03:03:37Z. Geological Survey (U.S.). The Survey. English. cartographic image. Public. California and Sierra Nevada Mountains Region (Calif. and Nev.).