Drummond Member

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Lithostratigraphy: Hunton Limestone Megagroup >>Kankakee Formation >>Drummond Member
Chronostratigraphy: Paleozoic Erathem >>Silurian System >>Alexandrian Series
Allostratigraphy: Tippecanoe 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)

H. B. Willman and Elwood Atherton


Original description

The Drummond Member of the Kankakee Formation (Willman, 1973, p. 17).


Named for Drummond, Will County, 5.5 miles southwest of the type section.

Other names


Type section

Type location

The type section of the Drummond Member is located in a railroad cut on the southeast side of the Des Plaines River Valley, 2 miles southwest of Joliet, Will County (NW SE SW 30, 35N-10E), where the member is 8.5 feet thick.

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

The Drummond Member is the basal member of the Kankakee Formation.

Extent and thickness

The Drummond Member is as much as 11 feet thick in the Joliet area but thins to only 1 foot thick along the Kankakee River.


The Drummond Member is pure, vesicular to coarsely vuggy, gray dolomite that generally contains abundant grains of glauconite, scattered grains of well rounded quartz sand, relatively large chert nodules, and large colonies of corals.




Well log characteristics


The Platymerella Zone occurs in the lower part of the Drummond Member, with the fossils most common in lenses of chert.

Age and correlation

Environments of deposition

Economic importance



WILLMAN, H. B., 1973, Rock stratigraphy of the Silurian System in northeastern and northwestern Illinois: Illinois State Geological Survey Circular 479, 55 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation