Historical:Harmattan Till Member
John C. Frye and H. B. Willman
The Harmattan Till Member of the Banner Formation (Johnson et al., 1971, p. 194) is 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).
Extent and Thickness
In the type area it is 8 feet thick, and it is known definitely only in the Danville area.
It is bounded at the base by the Belgium Member, or bedrock, and at the top by the Hillery Till Member.
The member is largely gray, calcareous, dense, hard till, but the upper part contains lenticular bodies of gravelly sand.
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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