Harmattan Till Member
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.
John C. Frye and H. B. Willman
Harmattan Till Member, Banner Formation (Johnson et al., 1971, p. 194).
Named for the Harmattan Strip Mine near Danville, Vermilion County (NE 4, 19N-12W).
The type section is in the Harmattan Strip Mine near Danville, Vermilion County (NE 4, 19N-12W).
It is bounded at the base by the Belgium Member, or bedrock, and at the top by the Hillery Till Member.
Extent and thickness
In the type area it is 8 feet thick, and it is known definitely only in the Danville area.
The member is largely gray, calcareous, dense, hard till, but the upper part contains lenticular bodies of gravelly sand.
Well log characteristics
Age and correlation
Environments of deposition
JOHNSON, W. H., D. L. GROSS, and S. R. MORAN, 1971, Till stratigraphy of the Danville region, east-central Illinois, in Till, A Symposium: Ohio State University Press, Columbus, p. 184-216; Illinois State Geological Survey Reprint 1972-I.
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