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- |category7=Cedar Bluff Limestone Group |category9=Limestone4 KB (492 words) - 21:03, 21 October 2019
- |category6=Cedar Bluff Limestone Group |category8=Limestone2 KB (305 words) - 21:56, 17 January 2017
- ...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p. ...Creek Group is dominantly shale and limestone and consists of the Downeys Bluff, Bethel, and Ridenhower Formations (fig. M-25). Although the Bethel is norm2 KB (316 words) - 20:43, 17 January 2017