Tuscaloosa Formation (abandoned)
The Tuscaloosa Formation has been abandoned in Illinois. The formation in Illinois and Missouri was found to be a different age than deposits in Kentucky and Tennessee, and the unit has been renamed Post Creek Formation.
Harrison, Richard W. and Ronald J. Litwin, 1997, Campanian coastal plain sediments in southeastern Missouri and southern Illinois— significance to the early geologic history of the northern Mississippi Embayment: Cretaceous Research 18, no. 5, p. 687-696.
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