Historical:Oakland Till Member

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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
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Lithostratigraphy: Oakland Till Member
Chronostratigraphy: Cenozoic Erathem >>Quaternary System >>Pleistocene Series


John C. Frye and H. B. Willman

Name Origin

The Oakland Till Member of the Wedron Formation (Ford, in Johnson et al., 1972, p. 15) is named for Oakland, Coles County, where it is the surface drift.

Type Section

It has been described only from its occurrence in the Harmattan strip mine in Vermilion County (NE NE NW 4, 19N-l2W).

Extent and Thickness

In the Harmattan strip mine it ranges from 0 to more than 30 feet thick.

Stratigraphic Position

It occurs above Robein Silt and is overlain by the Glenburn Till Member.


It is a coarse, blocky, calcareous, brown till containing wood fragments and mollusk shells (dated at 20,800 ± 130 radiocarbon years B.P.; sample ISGS-81). It locally contains thin beds of silt, sand, and gravel at the base.


JOHNSON, W. H., L. R. FOLLMER, D. L. GROSS, and A. M. JACOBS, 1972, Pleistocene stratigraphy of east-central Illinois: Illinois State Geological Survey Guidebook Series 9, 97 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation