Wasco Member

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Lithostratigraphy: Wasco Member
Chronostratigraphy: Cenozoic Erathem >>Quaternary System >>Pleistocene Series


The lithogenic-based Batavia, Mackinaw, and Wasco members of the Henry Formation defined by Willman and Frye (1970) are not retained as formal lithostratigraphic units; instead, the names are retained for informal sedimentary facies that are helpful in understanding glacial history and predicting relationships among materials.


HANSEL, Ardith K. and W. Hilton JOHNSON, 1996, Wedron and Mason Groups: Lithostratigraphic Reclassification of Deposits of the Wisconsin Episode, Lake Michigan Lobe Area: Illinois State Geological Survey Bulletin 104, 116 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation