Historical:Argyle Till Member
H. B. Willman and John C. Frye
The Argyle Till Member of the Winnebago Formation was informally named the Argyle till (Frye et al., 1969, p. 26) for Argyle, Winnebago County, from exposures in the vicinity of Argyle on the Winnebago County line.
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.
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).
Age and correlation
The Argyle Till Member is in the midpart of the Altonian Substage of the Wisconsinan Stage.
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.
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