USGS 6128-CO. Pond west of Mt. Horeb and Carrick Road interesction: Katian, Kentucky

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda - Bellerophontida - Bellerophontidae
Sphenosphaera clausus (Ulrich and Scofield 1897)
Rhynchonellata - Orthida - Platystrophiidae
Platystrophia colbiensis Foerste 1910
Alberstadt 1979
see common names

Geography
Country:United States State/province:Kentucky County:Scott
Coordinates: 38.2° North, 84.4° West (view map)
Paleocoordinates:26.8° South, 59.8° West
Basis of coordinate:based on nearby landmark
Geographic resolution:small collection
Time
Period: Ordovician Epoch: Late Ordovician
Stage: Katian 10 m.y. bin: Ordovician 5
Key time interval: Katian
Age range of interval: 453 - 445.2 m.y. ago
Stratigraphy
Formation:Clays Ferry
Stratigraphic resolution:bed
Stratigraphy comments: "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."
Lithology and environment
Primary lithology:planar lamination,shelly/skeletal,gray lithified "limestone"
Secondary lithology:planar lamination,gray,green lithified "shale"
Includes fossils?Y
Lithology description: "This 120 to 220 ft of interbedded limestone and shale straddles the Middle-Upper Ordovician boundary. To the south it intertongues with the upper members of the Lexington Limestone, but to the north it becomes younger and intertongues with the shales of the Kope Formation in north-central Kentucky. 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."
Environment:marine indet.
Taphonomy
Modes of preservation:body,replaced with silica
Size of fossils:macrofossils,mesofossils
Collection methods and comments
Collection excludes:some macrofossils,difficult macrofossils
Reason for describing collection:general faunal/floral analysis
Museum repositories:USNM
Metadata
Database number:100175
Authorizer:P. Wagner Enterer:H. Street, P. Wagner
Modifier:P. Wagner Research group:marine invertebrate
Created:2010-12-01 03:35:13 Last modified:2023-01-23 16:31:42
Access level:the public Released:2010-12-01 03:35:13
Creative Commons license:CC BY
Reference information

Primary reference:
10963. G.P. Wahlman. 1992. Middle and Upper Ordovician symmetrical univalved mollusks (Monoplacophora and Bellerophontina) of the Cincinnati Arch region. United States Geological Survey Professional Paper 1066(O):1-123 [P. Wagner/P. Wagner/E. Ito]

Secondary references:

61873 L. P. Alberstadt. 1979. The brachiopod genus Platystrophia. United States Geological Survey Professional Paper 1066(B):B1-B20 [P. Wagner/P. Wagner]