Tanners Creek Formation defined as the alternating thin-bedded fossiliferous limestones and calcareous shales between top of rubbly limestone of Mount Auburn Formation and base of massive argillaceous Whitewater Formation. Name is proposed for strata previously included in Arnheim, Waynesville, and Liberty Formations in lower part of Richmond Group. These three formations were originally defined as faunal zones and are indistinguishable from one another. Consists of thin layers of fossiliferous and barren limestone, alternating with layers of calcareous shale. Thickness is 210 ft at type section. Age is Late Ordovician.

Source: GNU records (USGS DDS-6; Reston GNULEX).

Rocks assigned by Fox (1962) to Tanners Creek are herein included at top of Dillsboro Formation (new) because present writers were unable to find a lithostratigraphic boundary regionally corresponding to base of Tanners Creek.

Source: GNU records (USGS DDS-6; Reston GNULEX).

The Cincinnatian Series is divided into five depositional sequences in this report, which correspond to lithostratigraphic units. The following stratigraphic names in KY should be abandoned as they have been applied to bodies of rock already named in downramp areas of OH and IN: Bardstown (=Lower Whitewater), Reba (=Oregonia), Stingy Creek (=Mount Auburn), Calloway Creek (=Bellevue), and Clays Ferry (=Fairview). The following units in KY, OH, and IN lump dissimilar facies and straddle sequence boundaries and therefore should be abandoned: Drakes, Ashlock, Dillsboro, Tanners Creek, and Bull Fork. Grant Lake has been defined in several different ways and consequently should be abandoned. Several units will be redefined at a later date, including the Upper Whitewater and the "Sunset" and "Saluda" of OH and IN. Formal naming of new lithostratigraphic units will follow further study. [Though Tanners Creek was replaced by Dillsboro several years ago, Holland includes both as distinct units in his fig. 13.]

Source: GNU records (USGS DDS-6; Reston GNULEX).