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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 30 (1946)

Issue: 1. (January)

First Page: 63

Last Page: 83

Title: Mineralogy of Late Upper Cretaceous, Paleocene, and Eocene Sandstones of Los Banos District, West Border of San Joaquin Valley, California

Author(s): S. N. Daviess (2)


The mineral composition of 192 outcrop and core samples from sandstones of late Upper Cretaceous, Paleocene, and Eocene age in the Los Banos district are tabulated. The mineral composition appears to afford few data for differentiating and correlating late Upper Cretaceous and Paleocene sandstones of the Los Banos district. The Eocene Domengine formation in the southern part of the area shows a marked increase in glaucophane as compared with the Paleocene and late Upper Cretaceous sandstones. The mineral suites are interpreted as indicating derivation from eastern and western sources, glaucophane being the most reliable indicator of a western source. Kaolinite, possibly of the anauxite type, occurs in white sands of Ione type in the Martinez (?) formation of possible Pale cene age, in outcrop sections and in a subsurface sand.

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