USGS 7784-CO. Southeast of Route 27 crossing of Kentucky River (Ordovician of the United States)

Where: Garrard County, Kentucky (37.8° N, 84.6° W: paleocoordinates 27.5° S, 63.4° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Curdsville Limestone Member (Lexington Limestone Formation), Turinian (460.9 - 449.5 Ma)

• "Basal 2 ft of Curdsville Limestone Member."

Environment/lithology: shallow subtidal; lithified, shelly/skeletal limestone

• "marine transgression, with higher energy, shallow-water deposits grading upward into lower energy deposits."
• "The lower 10-ft-thick unit is light-colored bioclastic limestone that consists of calcirudites, and crossbedded and ripple-marked calcarenites. The lower unit is composed of well-sorted, abraded skeletal debris having about 5 to 10 percent quartz sand."

Size class: macrofossils

Preservation: replaced with silica

Reposited in the USNM

Primary reference: 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]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 101377: authorized by Pete Wagner, entered by Hallie Street on 21.12.2010, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

 Strophomenida - Strophomenidae
 Pentamerida - Camerellidae
 Rhynchonellida - Rhynchotrematidae
 Bellerophontida - Bucaniidae
Salpingostoma kentuckyense Ulrich and Scofield 1897 snail
 Bellerophontida - Pterothecidae
"Carinaropsis acuta" = Carinaropsis minima Ulrich and Scofield 1897 snail
Pterotheca expansa Emmons 1842 snail
Pterotheca angusta Raymond 1921 snail
 Bellerophontida - Tropidodiscidae
"Tropidodiscus subacutus" = Alaskadiscus subacutus
"Tropidodiscus subacutus" = Alaskadiscus subacutus Ulrich and Scofield 1897 snail
 Archinacellida - Archinacellidae
Archinacella simulatrix Ulrich and Scofield 1897
 Tryblidiida - Archaeophialidae
 Tryblidiida - Proplinidae
Vallatotheca unguiformis Ulrich and Scofield 1897
 Hybocrinida - Hybocystitidae
Hybocystites problematicus2 Wetherby 1880 Sea lily