Borden Formation (Mississippian) in south- and southeast-central Kentucky

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Abstract

The Borden Formation is a major stratigraphic unit in south-and southeastcentral Kentucky.It includes strata divided by P. B. Stockdale in 1939 into the New Providence, Brodhead, Floyds Knob, and Muldraugh Formations of the Borden Group and locally also strata previously assigned to the Salem and Warsaw Limestones and to the St. Louis Limestone.The older nomenclature is unsuitable because the named stratigraphic units are not mappable.The Borden Formation in south-and southeast-central Kentucky is composed of clayey and silty shale, limy and shaly siltstone and siltstone, and cherty, dolomitic, and argillaceous limestone and limestone.These rock types differ in proportion from place to place, but characterize mappable units that in this report are newly named or redefined as members of the Borden Formation.Members of the Borden recognized in this report are the Nancy Member (shale and shaly siltstone), the Cowbell and Halls Gap Members (resistant siltstone), the Nada and Wildie Members (shale and siltstone), the Renfro Member (argillaceous limestone and dolomite), and the Muldraugh Member (cherty and dolomitic limestone, limestone, and limy and dolomitic siltstone).The Borden Formation conformably overlies black shale the New Albany Shale of Devonian age in south-central and part of southeast-central Kentucky, the generally equivalent Chattanooga Shale in part of southeast-central Kentucky, and the Sunbury Shale of Early Mississippian age in northeast Kentucky.The Borden is conformably overlain by the Salem and Warsaw Limestones of Late Mississippian age in south-central Kentucky and by the Newman Limestone of Late Mississippian age in southeast-central Kentucky.The Borden ranges from about 220 to 450 feet in thickness in south-and southeast-central Kentucky.The Borden Formation is chiefly of Early Mississippian age, but it locally includes some beds of Late Mississippian age.

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