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.
H. B. Willman and Elwood Atherton
The Drummond Member of the Kankakee Formation (Willman, 1973, p. 17).
Named for Drummond, Will County, 5.5 miles southwest of the type section.
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.
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
WILLMAN, H. B., 1973, Rock stratigraphy of the Silurian System in northeastern and northwestern Illinois: Illinois State Geological Survey Circular 479, 55 p.
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