Borden Formation

The Mississippian Borden Formation is a mapped bedrock unit in Kentucky, Indiana, Illinois, Ohio, West Virginia, and Tennessee. It has many members, which has led some geologists to consider it a group (for example in Indiana ) rather than a formation (for example in Kentucky ).

Stratigraphy
There are three members of the Borden Group in Indiana.

Edwardsville Formation
The Edwardsville Formation is a geological structure in the Borden Group, of the Lower Mississippian sub system, (Osagean, late Tournaisian). Crinoids fossils can be found in the formation.

New Providence Shale
The New Providence Shale is a geologic formation in Indiana.

Spickert Knob Formation
The Spickert Knob Formation is a geologic formation in Indiana

Fossils

 * Scyphozoans: Conularia sp. (from Borden Formation), Paraconularia sp. (from Coral Ridge Member, New Providence Shale)
 * Hexactinellid Sponges (from Muldraugh Formation)
 * Brachiopods: Orthotetes keokuk (from Borden Formation), Orbiculoidea (from Coral Ridge Member, New Providence Shale)
 * Trilobite: Phillibole conkini (Coral Ridge Member, New Providence Formation, Borden Group)
 * Cephalopods: Cantabricanites greenei, Polaricyclus ballardensis, Winchelloceras knappi (all from Coral Ridge Member, New Providence Formation, Borden Group), Muenstroceras oweni, M. parallelum, Kazakhstania colubrella, Imitoceras ixion, Masonoceras kentuckiense, Merocanites drostei, Dzhaprakoceras sp., Polaricyclus bordenensis, Winchelloceras allei (all from Nada and Cowbell Members)
 * Crinoids: Pachyocrinus aequalis (from Muldraugh Mbr.), Gilmocrinus kentuckyensis (from Muldraugh Mbr.), Rhodocrinites barrisi divergens, Gilbertsocrinus tuberculosus, Gilbertsocrinus typus, Actinocrinites eximius, Actinocrinites scitulus, Blairocrinus protuberatus, Steganocrinus, Uperocrinus pyriformis, Uperocrinus acuminatus, Eretmocrinus cloelia, Macrocrinus konincki, Dorycrinus quinquelobus, Aorocrinus nodulus, Agaricocrinus planoconvexus, Agaricocrinus inflatus, Dichocrinuspocillum Dichocrinus, Paradichocrinus liratus, Platycrinites glyptus, Platycrinites planus, Platycrinities spinifer, Cyathocrinites iowensis, Barycrinus spurious, Costalocrinus cornutus, Meniscocrinus, Pellecrinus obuncus, Atelestocrinus kentuckyensis, Holcocrinus spinobrachiatus, Blothrocrinus swallovi, Coeliocrinus subspinosus, Decadocrinus scalaris, Taxocrinus, Synbathocrinus dentatus, Halysiocrinus dactylus (from Nada Mbr.).
 * Blastoids: Granatocrinus kentuckyensis (from New Providence Shale)

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).

Trace fossils
Zoophycos is present in the turbidites of the Farmers Member of the Borden Formation in Kentucky.