Big Clifty Sandstone Member
Lithostratigraphy: Pope Megagroup >>Okaw Group >>Golconda Group >>Fraileys Shale >>Big Clifty Sandstone Member
Chronostratigraphy: Paleozoic Erathem >>Mississippian Subsystem >>Chesterian Series >>Hombergian Stage
Allostratigraphy: Kaskaskia 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)
Elwood Atherton, Charles Collinson, and Jerry A. Lineback
Name
Original description
Big Clifty Sandstone Member of the Fraileys Shale (Norwood, 1876, p. 405).
Derivation
Named for Big Clifty Creek, Grayson County, Kentucky.
Other names
History/background
Type section
Type location
The type section of the Big Clifty Sandstone Member is along the Big Clifty Creek, 2 miles southwest of the village of Big Clifty.
Type author(s)
Type status
Reference section
Reference location
Reference author(s)
Reference status
Stratigraphic relationships
It is near the middle of the Fraileys or, less commonly, near the base. In Indiana the Big Clifty occupies nearly the whole of the interval represented by the Fraileys Shale in Illinois.
Extent and thickness
The Big Clifty enters Illinois from the east and wedges out within a few tens of miles. Many wells in Lawrence, northern and eastern Jasper, and southern Cumberland Counties encounter 15-20 feet of Big Clifty. A few sporadic occurrences have been found in Marion County and east of there.
Lithology
Core(s)
Photograph(s)
Contacts
Well log characteristics
Fossils
Age and correlation
Environments of deposition
Economic importance
“Big Clifty” and “Jackson” are informal names applied to producing zones in the Big Clifty Sandstone Member of the Fraileys Shale.
Remarks
References
NORWOOD, C. J., 1876, Report on the geology of the region adjacent to the Louisville, Paducah, and Southwestern Railroad, with a section: Kentcuky Geological Survey, v. 1, p. 355-488.
ISGS Codes
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