Kellerville Till Member

Lithostratigraphy: Glasford Formation >>Kellerville 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

Kellerville Till Member, Glasford Formation (Willman and Frye 1970).

Derivation

The Kellerville Till Member is named for Kellerville, Adams County.

Other names

The name Kellerville replaces the terms Mendon Till (Frye, Willman, and Glass, 1964; Frye et al., 1969) and Payson Till (Leighton and Willman, 1950; Wanless, 1957).

Type section

Type location

The Kellerville Till Member is named for roadcut exposures 2 miles southwest of Kellerville in the Washington Grove School Section (table 6), NW NW SW Sec. 11, T. 2 S., R. 5 W. The Kellerville Till is also described in the Cottonwood School, Enion, and Tindall School Sections (table 6).

Table 6 -- Stratigraphic Sections (partial) The following 21 stratigraphic sections describe exposures in Illinois and illustrate many of the aspects of Pleistocene stratigraphy. These sections contain the type localities for 21 rock-stratigraphic units, 4 soil-stratigraphic units, and 3 time-stratigraphic units and include paratypes for several other units. The sample numbers preceded by "P" are the numbers used in the Illinois State Geological Survey collections. Analytical data on many of these samples are on file at the Survey. The sections are arrange alphabetically by name.

Chapin Section and Cottonwood School Section Cottonwood School Section (cont.) and Enion Section Enion Section (cont.), Farm Creek Section, and Flat Rock Section Flat Rock Section (cont.), Gale Section, and Jubilee College Section Pulleys Mill Section, Rochester Section, and Tindall School Section Tindall School Section (cont.) and Toulon Section Toulon Section (cont.), Washington Grove Section, and Wedron Section

Stratigraphic relationships

The Kellerville Till is bounded at the base by the Petersburg Silt or, in its absence, by the top of the Yarmouth Soil. Its upper limit is the top of the Pike Soil (New Salem Northeast, Pleasant Grove Sections, table 6), the Duncan Mills Member, the Teneriffe Silt, or younger stratigraphic units.

Table 6 -- Stratigraphic Sections (partial) The following 21 stratigraphic sections describe exposures in Illinois and illustrate many of the aspects of Pleistocene stratigraphy. These sections contain the type localities for 21 rock-stratigraphic units, 4 soil-stratigraphic units, and 3 time-stratigraphic units and include paratypes for several other units. The sample numbers preceded by "P" are the numbers used in the Illinois State Geological Survey collections. Analytical data on many of these samples are on file at the Survey. The sections are arrange alphabetically by name.

Malden South Section (cont.), New Salem Northeast Section, and Petersburg Section Pleasant Grove School Section

Extent and thickness

It is as much as 150 feet thick in the deeper bedrock valleys, but it more commonly is 50 to 100 feet thick. Its geographic extent is shown in figure 6, and its spatial relationship is indicated diagrammatically in figure 7.

Fig. 6 -- Areal distribution of the dominantly till formations and members of Illinois. Fig. 7 -- Diagrammatic cross section showing the relations of formations and members of Illinoian age in western Illinois.

Lithology

The member consists of till with intercalated discontinuous zones of sand and gravel outwash and silt; it is more variable than the overlying tills and commonly has a significantly higher percentage of expandable clay minerals. The grain-size and clay mineral composition of the matrix is given in tables 2 and 5, and the average of heavy mineral analyses is given in table 4.

Table 2 -- Typical Compositions of Glacial Till Units. Table 4 -- Averages of Analyses of Selected Heavy and Light Minerals (Analyses of size fraction 0.062-0.250 mm). (From Frye, Glass, and Willman, 1962; Frye, Willman, and Glass, 1964; Willman, Glass, and Frye, 1963).

Table 5 -- Selected Analyses from Stratigraphic Sections Described in Table 6 (X-ray analyses by H. D. Glass, Illinois State Geological Survey). Table 5 -- Continued.

Age and correlation

The member is in the upper part of the Liman Substage of the Illinoian Stage. The till was deposited by the westernmost extension of the Lake Michigan Lobe.

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.
FRYE, J. C., H. B. WILLMAN, and H. D. GLASS, 1964, Cretaceous deposits and the Illinoian glacial boundary in western Illinois: Illinois State Geological Survey Circular 364, p. 28.
LEIGHTON, M. M., and H. B. WILLMAN, 1950, Loess formations of the Mississippi Valley: Journal of Geology, v. 58, no. 6, p. 599-623. (Reprinted as Illinois State Geological Survey Report of Investigations 149)
WANLESS, H. R., 1957, Geology and mineral resources of the Beardstown, Glasford, Havana, and Vermont Quadrangles: Illinois Geological Survey Bulletin 82, 233 p.

ISGS Codes

Stratigraphic Code	Geo Unit Designation
0970	g-kw