Historical:Momence Sandstone Member
Lithostratigraphy: Knox Dolomite Megagroup >>Eminence Formation >>Momence Sandstone Member
Chronostratigraphy: Paleozoic Erathem >>Cambrian System >>Croixan Series >>Trempealeauan Stage
Allostratigraphy: Sauk Sequence
T. C. Buschbach
The Momence Sandstone Member of the Eminence Formation (Buschbach, 1964, p. 41) is named for Momence, Kankakee County, just east of the type section.
The type section of the Momence Sandstone Member of the Eminence Formation is located just west of Momence, Kankakee County, and is at a depth of 1650-1660 feet in the Hughes Oil Company No. 1 Parish boring (NW NW SW 24, 31N-13E) (sample set 997).
Extent and Thickness
The Momence Member varies from 0-15 feet thick but is somewhat discontinuous.
The Momence Sandstone Member is the only member differentiated in the Eminence Formation and occurs at the base. It consists of light gray, dolomitic, poorly sorted sandstone, and in places contains interbedded green and gray sandy shale.
BUSCHBACH, T. C., 1964, Cambrian and Ordovician strata of northeastern Illinois: Illinois State Geological Survey Report of Investigations 218, 90 p.
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