Historical:Oakland Till Member
John C. Frye and H. B. Willman
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.
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.
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.
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