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.
T. C. Buschbach
The Charter Member of the Mt. Simon Sandstone (Templeton, 1950, p. 156).
Named for Charter Oak School, De Kalb County.
The type section of the Charter Member of the Mt. Simon Sandstone is located 3.5 miles south of Charter Oak School, DeKalb County. It is the interval from 1381-1648 feet deep (sample set 1466) in the same boring as the Lacey Member.
The Charter Member is the uppermost member of the Mt. Simon Sandstone.
Extent and thickness
The Charter Member is 145-320 feet thick.
It is medium- to fine-grained, partly conglomeratic sandstone with some red micaceous shale at or near the base.
Well log characteristics
Age and correlation
Environments of deposition
TEMPLETON, J. S., 1950, Mt. Simon Sandstone in northern Illinois: Illinois Academy of Science Transactions, v. 43, p. 151-159.
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