Argyle Till Member

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Lithostratigraphy: Winnebago Formation >>Argyle Till Member
Chronostratigraphy: Cenozoic Erathem >>Quaternary System >>Pleistocene Series

Primary source

Willman, H. B., and John C. Frye, 1970, Pleistocene Stratigraphy of Illinois: Illinois State Geological Survey Bulletin 94, 204 p.

Contributing author(s)

H. B. Willman and John C. Frye


Original description

Informally named the Argyle till (Frye et al., 1969, p. 26).


Named for Argyle, Winnebago County, from exposures in the vicinity of Argyle on the Winnebago County line.

Other names


Type section

Type location

Its type section is the Rock Valley College Section 5 miles southwest of Argyle, SW NW SW Sec. 10, T. 44 N., R. 2 E.

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

The Argyle is bounded at the top by its contact with the Plano Silt Member or overlying beds, and its basal contact is with unnamed silts in the lower part of the Winnebago Formation or older deposits.

Extent and thickness

The geographic distribution as a surface till is shown in figure 6, and the spatial relations are shown diagrammatically in figure 8.


The till is exceptionally sandy, as shown in table 2, and pinkish tan or salmon in color. Its composition has been described by the Greenway School cores and the Beaverton, Byron West, Dixon Northwest, Grand Detour, and Meridian Road No. 3 Sections (Frye et al., 1969).




Well log characteristics


Age and correlation

The Argyle Till Member is in the midpart of the Altonian Substage of the Wisconsinan Stage.

Environments of deposition

Economic importance



FRYE, J. C., H. D. GLASS, J. P. KEMPTON, and H. B. WILLMAN, 1969, Glacial Tills of Northwestern Illinois: Illinois State Geological Survey Circular 437, 47 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation