Where: Scott County, Kentucky (38.2° N, 84.4° W: paleocoordinates 27.3° S, 62.9° W)
• coordinate based on nearby landmark
• small collection-level geographic resolution
When: Belodina confluens conodont zone, Clays Ferry Formation, Shermanian (460.9 - 449.5 Ma)
• "Toungue of Clays Ferry Formation between underlying Millersburg Member, Lexington Limestone, and overlying Tanglewood Limestone Member, Lexington Limestone.
•5-10 ft above base of Clays Ferry Formation tongue, 15-20 ft above Allonychia flanaganesis zone in Millersburg Memeber."
• bed-level stratigraphic resolution
Environment/lithology: marine; lithified, shelly/skeletal, gray limestone and lithified, gray, green shale
•Limestone makes up 30 to 60 percent of the Clays Ferry Formation. Beds are even and 1 to 6 in thick. The limestone varies from medium- to dark-gray, argillaceous calcisiltite to medium-gray brachiopodal limestone to medium-gray crinoidal calcarenite. The calcisiltite is sparsely fossiliferous and contains mainly crinoidal fragments and some gastropods. The brachiopoal limestone is characterized by abundant Rafinesquina, some of which are shingled, as well as by Sowerbyella and Dalmanella, all packed in a mud matrix. Bryozoans are also common.
•Shale makes up 30 to 60 percent of the formation. It is generally greenish to olive gray, and is present in distinctly laminated sets 1 to 12 in thick. Fossils generally are sparse in these shales, though bryozoans are common at some locations.
•Siltstone makes up 5 to 10 percent of the unit, occurring mainly in the upper part. It is present mostly in 1- to 3-in even beds in which fossils are sparse. This lithology resembles the Garrard Siltstone, which overlies the Clays Ferry in south-central Kentucky."
Size classes: macrofossils, mesofossils
Preservation: replaced with silica
Reposited in the USNM
Primary reference: G.P. Wahlman. 1992. Middle and Upper Ordovician symmetrical univalved molluscs (Monoplacophora and Bellerophontina) of the Cincinnati Arch region. United States Geological Survey Professional Paper 1066(O):1-123 [P. Wagner/P. Wagner/P. Wagner] more details
Purpose of describing collection: general faunal/floral analysis
PaleoDB collection 100175: authorized by Pete Wagner, entered by Hallie Street on 01.12.2010