Historical:Elmhurst Sandstone Member

From ILSTRAT
Jump to: navigation, search
Handbook of Illinois Stratigraphy
Series Bulletin 95
Author H. B. Willman, Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, Jack A. Simon
Date 1975
Link Web page
PDF PDF file
Store ISGS Store

Lithostratigraphy: Knox Dolomite Megagroup >>Eau Claire Formation >>Elmhurst Sandstone Member
Chronostratigraphy: Paleozoic Erathem >>Cambrian System >>Croixan Series >>Dresbachian Stage
Allostratigraphy: Sauk Sequence

Author

T. C. Buschbach

Name Origin

The Elmhurst Sandstone Member of the Eau Claire Formation (Buschbach, 1964, p. 32), the basal member, is named for Elmhurst, Du Page County.

Type Section

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).

Extent and Thickness

The Elmhurst Member is widely distributed in the northern half of Illinois and is 10-200 feet thick.

Description

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.

References

BUSCHBACH, T. C., 1964, Cambrian and Ordovician strata of northeastern Illinois: Illinois State Geological Survey Report of Investigations 218, 90 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation
8800
--