McWain Sandstone Member

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Lithostratigraphy: McLeansboro Group >>Bond Formation >>McWain Sandstone Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Missourian Series
Allostratigraphy: Absaroka Sequence

Primary source

Willman, H. B., Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, and Jack A. Simon, 1975, Handbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.

Contributing author(s)

M. E. Hopkins and J. A. Simon


Original description

The McWain Sandstone Member of the Bond Formation (Ball, 1943, p. 150).


Named for the McWain Farms, Macoupin County.

Other names


Type section

Type location

The type section consists of exposures along Macoupin Creek (SE 25, 10N-7W) (Ball, 1952, p. 44).

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

The McWain occurs as a channel sandstone in southwestern Illinois, where it locally rests on the Shoal Creek Limestone or on strata between the Shoal Creek and the Macoupin Limestone.

Extent and thickness





Well log characteristics


Age and correlation

It has been correlated with the Mt. Carmel Sandstone.

Environments of deposition

Economic importance



BALL, J. R., 1943, Pennsylvanian stratigraphy of the Carlinville, Illinois, Quadrangle: Illinois Academy of Science Transactions, v. 36, p. 147-150; 1944, Illinois State Geological Survey Circular 102.
BALL, J. R., 1952, Geology and mineral resources of the Carlinville Quadrangle: Illinois State Geological Survey Bulletin 77, 110 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation