Indiana: The Mississippian Borden Group (sometimes Borden Formation) is a mapped bedrock unit in Kentucky, Indiana, Illinois, Ohio, West Virginia,[7] and Tennessee.

It has many members, which has led some geologists to consider it a group (for example in Indiana[8]) rather than a formation (for example in Kentucky[1][4]).

A rare soft-bodied fossil that was recovered from the Farmers Member of the Borden Formation in northeastern Kentucky was interpreted as a chondrophorine float (an internal anatomical feature).

[13] Zoophycos is present in the turbidites of the Farmers Member of the Borden Formation in Kentucky.

The Edwardsville Formation is a geological structure in the Borden Group, of the Lower Mississippian sub system,[14] (Osagean, late Tournaisian).