Charter Member
Lithostratigraphy: Potsdam Sandstone Megagroup >>Mt. Simon Sandstone >>Charter Member
Chronostratigraphy: Paleozoic Erathem >>Cambrian System >>Croixan Series >>Dresbachian Stage
Allostratigraphy: Sauk 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)
T. C. Buschbach
Name
Original description
The Charter Member of the Mt. Simon Sandstone (Templeton, 1950, p. 156).
Derivation
Named for Charter Oak School, De Kalb County.
Other names
History/background
Type section
Type location
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.
Type author(s)
Type status
Reference section
Reference location
Reference author(s)
Reference status
Stratigraphic relationships
The Charter Member is the uppermost member of the Mt. Simon Sandstone.
Extent and thickness
The Charter Member is 145-320 feet thick.
Lithology
It is medium- to fine-grained, partly conglomeratic sandstone with some red micaceous shale at or near the base.
Core(s)
Photograph(s)
Contacts
Well log characteristics
Fossils
Age and correlation
Environments of deposition
Economic importance
Remarks
References
TEMPLETON, J. S., 1950, Mt. Simon Sandstone in northern Illinois: Illinois Academy of Science Transactions, v. 43, p. 151-159.
ISGS Codes
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