Elmhurst Sandstone Member
Lithostratigraphy: Knox Dolomite Megagroup >>Eau Claire Formation >>Elmhurst Sandstone Member
Chronostratigraphy: Paleozoic Erathem >>Cambrian System >>Croixan Series >>Dresbachian Stage
Allostratigraphy: Sauk Sequence
Willman, H. B., Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, and Jack A. Simon, 1975, Handbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.
T. C. Buschbach
The Elmhurst Sandstone Member of the Eau Claire Formation (Buschbach, 1964, p. 32).
Named for Elmhurst, Du Page County.
The type section of the Elmhurst Sandstone Member is located a half mile west of Elmhurst, Du Page County, at a depth of 1640-1759 feet in a boring (Wander Co. No. 11, SE NW NE 10, 39N-11E) (sample set 15,336).
The Elmhurst Sandstone Member is the basal member of the Eau Claire Formation.
Extent and thickness
The Elmhurst Member is widely distributed in the northern half of Illinois and is 10-200 feet thick.
Most of the Elmhurst is fine- to medium-grained, fossiliferous, gray sandstone that contains various amounts of interbedded gray shale. The basal part contains the sooty zone.
Well log characteristics
Age and correlation
Environments of deposition
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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