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by Stratigraphy.net
New from Snet: Lithologs, a new tool to create lithological/sedimentological logs online..

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Fithian Illite, lllinois, US

Fithian Illite at Salt Fork of Vermilion River near Fithian, IL Illite is one of the most frequent clay minerals and is an important constituent of many sedimentary rocks. It was named after the state of Illinois, United States, by Grim, Bray and Bradley in 1937. The type locality of the Late Pennsylvania Fithian cyclothem is also the type locality of the clay mineral illite. In October 2013 I

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