During years of painstaking work in the California Desert certain types of flint implements seem to have occurred again and again. Our work is now carried on with two main objectives: one to cover all likely areas where sites might be found, the other to try to discover if cultural groups follow certain geologic formations and if so, to place these types in their proper sequence, all of which is no very simple task. With these two main objectives in view, it is proposed to scour the more arid region of southern California, with the idea that any solution of the problems connected with this territory may prove a possible clew towards unraveling the story of prehistoric man in wider portions of the Great Basin, which we hope to explore in the future.