Clays Ferry Formation (Ordovician): A new map unit in south-central Kentucky
1965
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Abstract
The Clays Ferry Formation is a newly recognized major rock-stratigraphic unit in south-central Kentucky.It includes strata that were previously divided on the basis of the fauna into (in ascending order) the Cynthiana Formation of A. F. Foerste, the Fulton Shale, and the Million Shale of J. M. Nickles as used by A. F. Foerste.The Clays Ferry consists of interstratified thin-bedded shale, limestone, and siltstone.It ranges from about 120 to 220 feet in thickness, and is of late Middle and early Late Ordovician age.The Clays Ferry Formation overlies and intertongues with thick-bedded limestone of the Lexington Limestone ; it grades into the overlying Garrard Siltstone.
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