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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 24 (1954)No. 4. (December), Pages 270-274

Feldspathized Shales from Minnesota

Malcolm P. Weiss

ABSTRACT

Three thin beds of brittle shale, one from the Stewartville member of the Galena formation and two from the Dubuque formation, consist predominantly of authigenic orthoclase, with subordinate amounts of hydromica and montmorillonite. These beds are believed to be the product of feldspathization of bentonite derived from volcanic ash.


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