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Etchegoin Formation
The Etchegoin Formation is a Pliocene epoch geologic formation in the lower half of the San Joaquin Valley in central California.〔(USGS.gov: "Neogene Gas Total Petroleum System—Neogene Nonassociated Gas Assessment Unit of the San Joaquin Basin Province" ); Chapter 22 of the ''Petroleum Systems and Geologic Assessment of Oil and Gas in the San Joaquin Basin Province, California''; by Allegra Hosford Scheirer and Leslie B. Magoon.〕〔(USGS.gov: "The Kern River Formation, Southeastern San Joaquin Valley, California" ); Geological Survey Bulletin 1529-D; By J. Alan Bartow and Gardner M. Pittman; United States Government Printing Office, Washington, D.C.; 1983 (with map on pg. D4).〕
==Geology==
The shallow-water marine sandstone formation is found across the central and southern San Joaquin Valley, and with the overlying Pliocene nonmarine sand San Joaquin Formation, is associated with the numerous oil fields there.〔 The White Wolf Fault forms its southern boundary. It overlies the Antelope Shale unit of the Monterey Formation in its central and western sections.〔
In its southeastern section it is part of the Kern River Series, which is divided into an upper unit named the Kern River Beds Formation, a lower unit named the Chanac Formation, with the wedge of the Etchegoin Formation in the middle.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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