Named for Calloway Creek in north-central Madison Co., KY. Consists of gray, thinly bedded, highly fossiliferous limestone, much lesser shale, and minor siltstone. 125 ft thick in type locality, ranges from 80 to 130 ft thick. Conformably overlies Garrard Siltstone with gradational contact; conformably underlies Ashlock Formation. Grades north into Fairview Formation and south into Leipers Limestone. Replaces Fairview Formation in central and north-central KY.

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

The Calloway Creek Limestone in south-central KY consists of fine- to medium-grained, thin-bedded, gray limestone, greenish-gray calcareous shale, and calcareous siltstone. Fossils are abundant comprising mostly of brachiopods and bryozoans. Thickness is 80 to 130 feet. Conformably overlies the Garrard Siltstone, conformably underlies the Ashlock Formation, and grades laterally to the north into the Fairview Formation. The Calloway Creek is of Late Ordovician (early Maysvillian) age.

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" of OH and IN. Formal naming of new lithostratigraphic units will follow further study.

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