Hagarstown Member

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Lithostratigraphy: Pearl Formation >>Hagarstown 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

The Hagarstown Member of the Glasford Formation was informally named the Hagarstown beds by Jacobs and Lineback (1969, p. 12), for the south-central Illinois region.


It was named for Hagarstown, Fayette County, 5 miles west of the type section.

Other names


Type section

Type location

The type section is the Hickory Ridge Section (Jacobs and Lineback, 1969, p. 20), SW NW Sec. 30, T. 6 N., R. 1 E., Fayette County.

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

The Hagarstown Member lies stratigraphically above the Vandalia Till and contains the Sangamon Soil at the top. It is commonly overlain by Wisconsinan loesses.

Extent and thickness

It is probably more than 100 feet thick in some of the higher ridges. In surface expression the Hagarstown Member is the material of the elongate ridges, referred to as the "ridged drift," and of the sheet of dominantly water-laid sediments between the ridges. Its geographic distribution, origin, and composition have been described by Jacobs and Lineback (1969).


It consists of gravelly till, poorly sorted gravel, well sorted gravel, and sand.




Well log characteristics


Age and correlation

The Hagarstown Member is in either the early Jubileean or late Monican Substage of the Illinoian Stage.

Environments of deposition

Economic importance



JACOBS, A. M., and J. A. LINEBACK, 1969, Glacial geology of the Vandalia, Illinois, region: Illinois State Geological Survey Circular 442, 24 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation