| Borden Formation | |
|---|---|
| Stratigraphic range: Mississippian | |
Turbidites of Farmers Member of Borden Formation at mile marker 135, Interstate 64, Kentucky | |
| Type | Sedimentary |
| Sub-units | Kentucky:
|
| Thickness | Kentucky: 0–200 m (0–656 ft) |
| Lithology | |
| Primary | Shale, siltstone, sandstone |
| Other | Limestone |
| Location | |
| Region | Kentucky, Indiana, Illinois, Ohio, West Virginia, Tennessee |
| Country | United States |
| Extent | Cincinnati Arch, Appalachian Basin, Illinois Basin |
| Type section | |
| Named for | Borden, Clark County, Indiana |
| Named by | Cummings |
| Year defined | 1922 |
The Mississippian Borden Group (sometimes 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.
There are three members of the Borden Group in Indiana.
| Edwardsville Formation | |
|---|---|
| Stratigraphic range: Mississippian | |
| Type | Formation |
| Unit of | Borden Group |
| Underlies | Muldraugh Formation and Ramp Creek Formation |
| Overlies | Spickert Knob Formation |
| Location | |
| Region | Indiana |
| Country | United States |
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 | |
|---|---|
| Stratigraphic range: Mississippian | |
| Type | Formation |
| Unit of | Borden Group |
| Underlies | Spickert Knob Formation |
| Overlies | Coldwater Shale and Rockford Limestone |
| Location | |
| Region | Indiana |
| Country | United States |
The New Providence Shale is a geologic formation in Indiana. It is a basal clay-shale geologic formation in Indiana named by Charles Butts and William W. Borden in the 1874 after New Providence, Indiana (now Borden).
| Spickert Knob Formation | |
|---|---|
| Stratigraphic range: Mississippian | |
| Type | Formation |
| Unit of | Borden Group |
| Underlies | Edwardsville Formation |
| Overlies | New Providence Shale |
| Location | |
| Region | Indiana |
| Country | United States |
The Spickert Knob Formation is a geologic formation in Indiana.