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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)


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

Feldspathized Shales Previous HitfromNext Hit Minnesota

Malcolm P. Weiss


Three thin beds of brittle shale, one Previous HitfromNext Hit the Stewartville member of the Galena formation and two Previous HitfromNext Hit 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 Previous HitfromNext Hit volcanic ash.

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