Historical:Big Clifty Sandstone Member
Elwood Atherton, Charles Collinson, and Jerry A. Lineback
The Big Clifty Sandstone Member of the Fraileys Shale (Norwood, 1876, p. 405) is named for Big Clifty Creek, Grayson County, Kentucky.
The type section of the Big Clifty Sandstone Member is along the Big Clifty Creek, 2 miles southwest of the village of Big Clifty.
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.
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.
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.
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