Argyle Till Member

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

Name

Original description

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

Derivation

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

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.

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.

Fig. 6 -- Areal distribution of the dominantly till formations and members of Illinois. Fig. 8 -- Diagrammatic cross section showing the relations of formations and members of Wisconsinan age in northern and western Illinois.

Lithology

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).

Table 2 -- Typical Compositions of Glacial Till Units.

Age and correlation

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

References

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
0720	wi-a