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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
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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