Harmattan Till Member

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Lithostratigraphy: Banner Formation >>Harmattan Till Member
Chronostratigraphy: Cenozoic Erathem >>Quaternary System >>Pleistocene Series

Primary source

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.

Contributing author(s)

John C. Frye and H. B. Willman


Original description

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).

Other names


Type section

Type location

The type section is in the Harmattan Strip Mine near Danville, Vermilion County (NE 4, 19N-12W).

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

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

Economic importance



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.

ISGS Codes

Stratigraphic Code Geo Unit Designation