High Bridge, Tyrone Fm. (Ordovician of the United States)

Where: Jessamine County, Kentucky (37.8° N, 84.7° W: paleocoordinates 27.4° S, 63.4° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Tyrone Limestone Formation (High Bridge Group), Rocklandian (460.9 - 449.5 Ma)

• Tyrone Limestone

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; limestone

• nothing is said about the lithology of the Tyrone Ls. at this locality

Size class: macrofossils

Preservation: recrystallized, replaced with silica

Reposited in the USNM

Primary reference: R. C. Frey. 1995. Middle and Upper Ordovician nautiloid cephalopods of the Cincinnati Arch region of Kentucky, Indiana, and Ohio. U.S. Geological Survey Professional Paper 1066P:1-126 [S. Holland/S. Holland]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 87739: authorized by Björn Kröger, entered by Torsten Liebrecht on 23.03.2009, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Rostroconchia
 Conocardiida - Eopteriidae
Eopteria conocardiformis1 Pojeta and Runnegar 1976
USNM 209333; pl. 26 f. 16
Gastropoda
 Trochonematoidea - Trochonematidae
"? Lophospira notablis" = Trochonemella notablis2
"? Lophospira notablis" = Trochonemella notablis2 Ulrich and Scofield 1897 snail
 Euomphalina - Helicotomidae
Helicotoma planulatoides n. sp.2 Ulrich and Scofield 1897 snail
 Murchisoniina - Subulitidae
Cyrtospira bicurvata n. sp.2 Ulrich and Scofield 1897 snail
Subulites parvus n. sp.2 Ulrich and Scofield 1897 snail
Cephalopoda
 Orthocerida - Proteoceratidae
"Orthoceras tyronensis n. sp." = Proteoceras tyronensis
"Orthoceras tyronensis n. sp." = Proteoceras tyronensis Foerste 1912
USNM 87109 (type)
 Endocerida - Endoceratidae
Vaginoceras "sp. A" Hyatt 1884
MU 29868 (single silicified siphuncle)
 Actinocerida - Actinoceratidae
Actinoceras altopontense n. sp. Foerste and Teichert 1930
USNM 82196 (type)
Actinoceras kentuckiense n. sp. Foerste and Teichert 1930
USNM 82237 (type)
 Actinocerida - Ormoceratidae
Ormoceras ferecentricum n. sp. Foerste and Teichert 1930
USNM 82214 (type)