Borden Group

Borden Formation Stratigraphic range: Mississippian
Turbidites of Farmers Member of Borden Formation at mile marker 135, Interstate 64, Kentucky
Type	sedimentary
Sub-units	Kentucky: New Providence Shale, Kenwood Siltstone, Nancy, Holtsclaw Siltstone, Muldraugh, Farmers, Nada, Cowbell, and Renfro
Thickness	Kentucky: 0 to 200 m
Lithology
Primary	shale, siltstone, sandstone
Other	limestone
Location
Region	Cincinnati Arch, Appalachian Basin, Illinois Basin
Country	United States
Extent	Kentucky, Indiana, Illinois, Ohio, West Virginia, Tennessee
Type section
Named for	Borden, Clark County, Indiana
Named by	Cummings, 1922

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).

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).

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