Elmhurst Sandstone Member

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

Primary source

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.

Contributing author(s)

T. C. Buschbach

Name

Original description

The Elmhurst Sandstone Member of the Eau Claire Formation (Buschbach, 1964, p. 32).

Derivation

Named for Elmhurst, Du Page County.

Other names

History/background

Type section

Type location

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).

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

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.

Lithology

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.

Core(s)

Photograph(s)

Contacts

Well log characteristics

Fossils

Age and correlation

Environments of deposition

Economic importance

Remarks

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
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