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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 16 (1932)

Issue: 8. (August)

First Page: 777

Last Page: 785

Title: Occurrence of Oil in Metamorphic Rocks of San Gabriel Mountains, Los Angeles County, California

Author(s): Arthur B. Brown, W. S. W. Kew (2)


An occurrence of nearly water-white light-gravity oil obtained from wells drilled into metamorphic rocks on the north side of the San Gabriel Mountains, Los Angeles County, California, has been of interest to geologists for many years. The metamorphic rocks are in fault contact with sedimentary rocks, those at the surface being of late Pliocene and Pleistocene age. From a detailed study of the geology of this region the conclusion is reached that the oil has migrated in Eocene strata underlying the Pliocene and migrated along faults to its present position in the crystalline rocks. Filtration taking place during this migration is thought to have been competent to produce this light oil having a high percentage of aromatic hydrocarbons.

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