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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 57 (1973)

Issue: 12. (December)

First Page: 2443

Last Page: 2446

Title: Iron Sulfide Concretions from Tulare Formation at O'Neill Forebay Reservoir, Western Merced County, California

Author(s): Nikola P. Prokopovich (2)

Abstract:

Branchlike, 4-5 mm diameter concretions and a few associated irregular nodules of iron sulfide and its oxidation products found near the western margin of San Joaquin Valley, west of Los Banos, California, are the result of epigenetic cementation of fluvial sandy-clayey sediments of the Tulare Formation. The concretions commonly are oriented nearly vertically and form isolated clusters in an area of seepages of natural gas which contain both methane and hydrogen sulfide. Cementation was caused by chemical reactions of sediments and ground water with gases migrating along miniature, near-vertical passages.

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