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Preliminary Geologic Description of the San Jose 30 X 60 Minute Quadrangle, California: A Digital Database
The San Jose 30 x 60-minute quadrangle straddles the CaliforniaCoast Ranges southeast of San Francisco, and extends from west ofthe San Andreas fault near Santa Cruz on the southwest (long. -122�,lat. 37�) to the San Joaquin River in the Central Valley on thenortheast (long. -121�, lat. 37.5�). The map is a new geologiccompilation that is based on extensive previous work by many authorsand a great deal of new mapping, largely at 1:24,000, much of whichis previously unpublished.This report presents the preliminary geologic map of the San Jose 30x 60-minute quadrangle at a scale of 1:100,000, and consists of aspatial database of nine layers, two colored map sheets (geologicmap and correlation diagram), and a descriptive...
Cell maps for each oil and gas play were created by the USGS as a method for illustrating the degree of exploration, type of production, and distribution of production in a play or province. Each cell represents a quarter-mile square of the land surface, and the cells are coded to represent whether the wells included within the cell are predominantly oil-producing, gas-producing, both oil and gas-producing, or dry. The well information was initially retrieved from the Petroleum Information (PI) Well History Control System (WHCS), which is a proprietary, commercial database containing information for most oil and gas wells in the U.S. Cells were developed as a graphic solution to overcome the problem of displaying...
A digital version of the 1970 US Geological Survey topographic map of the San Francisco Bay region, three sheets, 1:125,000
This Open-File report is a digital topographic map database. Itcontains a digital version of the 1970 U.S. Geological Surveytopographic map of the San Francisco Bay Region (3 sheets), at ascale of 1:125,000.