Introduction

This map is a preliminary product of the Southern California Digital 1:100,000 Geologic Map Series (Southern California Areal Mapping Project—SCAMP; Morton and Kennedy, 1989). The 1:24,000 manuscript for this map was compiled from original sources, chiefly at 1:24,000, and scanned and processed digitally using the U.S. Geological Survey Alacarte menu-driven interface (Wentworth and Fitzgibbon, 1991) for ARC/Info, a commercial geographic information system (GIS) available from Environmental Systems Research Institute, Redlands, California. Minor adjustments have been made in geologic boundaries to conform to the metric base, which was enlarged from 1:100,000.

This 1:24,000 quadrangle is one of sixteen that form the west half of the Los Angeles 1:100,000 quadrangle; the 1:24,000-scale maps are intended to form the basic data supporting the regional-scale quadrangle, and thus include available data on exploratory oil wells and fossil collections.

Stratigraphic nomenclature is largely that of the source materials, modified where possible to reflect that of Yerkes and Campbell (1979), particularly in regard to units of the Topanga Group; nomenclature is subject to further modification as compilation progresses.

The map for this report consists of two plates: the 1:24,000 quadrangle (plate 1), and a 1:12,000 enlargement of the Pacific Palisades area (plate 2), originally mapped at 1:4800 (McGill, 1989).