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The AAPG/Datapages Combined Publications Database

Pacific Section of AAPG


Geology of the Midway-Sunset Oil Field and Adjacent Temblor Range, San Joaquin Basin, California, 2001
Pages 51-53
Regional Framework

Age of the Main Producing Horizons at the Midway-Sunset Oil Field, California

J. D. Fortier


The Midway-Sunset Oil Field produces primarily from Neogene sands and gravels which are found within the upper Monterey Formation, the Reef Ridge Shale, the Etchegoin Formation, the San Joaquin Formation and the lower and middle Tulare Formation. Age dates based on radiometric and paleontological analyses suggest that these producing horizons range in age from about 8.9 Ma (late early Mohnian) to about 1.0 Ma (Pleistocene).

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