A 3-day field trip, two 2-day trips, and three 1-day trips are being planned as parts of the program for next year's annual meeting of the Geological Society of America, scheduled for Los Angeles in November, 1954. Guidebook coverage of the usual type is in preparation for these excursions, mainly by the trip leaders and by members of the State Division of Mines. In addition, it has seemed desirable to supply more general geologic data than are included in most annotated road logs, and to this end a volume on the geology of southern California is being prepared for publication by the Division of Mines.

Organization of the book was the work of a 4-man committee, and was facilitated by advice and suggestions from numerous representatives of industry, State and Federal surveys, and academic institutions. The volume is intended to be a broad sampling of geological features and thought, as they relate to the southern California region, and its contents reflect an approach that is partly geographic and partly tropical. Emphasis has been placed on a wide variety of contributions by investigators qualified to make authoritative presentations and interpretations of data.

The major sections of the book deal with physical geography, general geology of the natural provinces, historical geology, geologic structure, geomorphology, mineralogy and petrology, hydrology, oil and gas, mineral deposits, and engineering geology. Some of the individual contributions are general in scope, and others deal with specific areas or problems; many contain information hitherto unpublished. Supplementing the main part of the book is a group of approximately thirty map-sheets of selected areas; each sheet includes a geologic map, sections, and a brief text. The entire volume comprises 108 contributions from 90 authors.

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