The Mojave Desert in southeastern California is a wedge-shaped region having its apex toward the west. This report deals with the western part of the desert - a part that is characterized by interior drainage and is sharply delineated by mountain ranges on both the southwest and northwest. The part mapped geologically inc1udes about 7,200 square miles between latitudes 34 34' and 35 30' N. and longitudes 117 and 119 W., or parts of Kern, Los Angeles,...