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).

Borden Formation
Stratigraphic range: Mississippian
Turbidites of Farmers Member of Borden Formation at mile marker 135, Interstate 64, Kentucky
TypeSedimentary
Sub-unitsKentucky:
  • New Providence Shale
  • Kenwood Siltstone
  • Nancy Holtsclaw Siltstone
  • Muldraugh,
  • Farmers,
  • Nada
  • Cowbell
  • Renfro

Indiana:

ThicknessKentucky: 0–200 m (0–656 ft)
Lithology
PrimaryShale, siltstone, sandstone
OtherLimestone
Location
RegionKentucky, Indiana, Illinois, Ohio, West Virginia, Tennessee
Country United States
ExtentCincinnati Arch, Appalachian Basin, Illinois Basin
Type section
Named forBorden, Clark County, Indiana
Named byCummings
Year defined1922
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