Pliocene Conglomerates of Los Angeles Basin and Their Paleogeographic Significance

Abstract

The Los Angeles Basin contains many thousand feet of Miocene, Pliocene, and Pleistocene strata, in which are numerous beds of conglomerate. In this paper the assemblages of rock types in the various conglomerates are considered, and an effort is made to correlate these assemblages with the materials in each of the source areas. Conclusions and inferences concerning the Tertiary history and paleogeography of the region are based on the composition of the conglomerates in the Tertiary sedimentary column, their relative positions in the column, their areal distribution, and their probable sources.