USGS 4073-CO: 0.75 miles east of Milner, then 1 miles southwest on Shryock Ferry (Ordovician of the United States)

Also known as Tyrone A section. Milner

Where: Woodford County, Kentucky (38.0° N, 84.8° W: paleocoordinates 27.2° S, 63.3° W)

• coordinate based on nearby landmark

• hand sample-level geographic resolution

When: Plectodina tenuis conodont zone, Grier Limestone Member (Lexington Limestone Formation), Shermanian (460.9 - 449.5 Ma)

• "Grier Limestone Member, Lexington Limestone [...] 148 ft above the base of the Curdsville Limestone Member, Lexington Limestone."

• bed-level stratigraphic resolution

Environment/lithology: open shallow subtidal; coarse-grained, nodular, shelly/skeletal limestone and fine-grained, nodular, shelly/skeletal, argillaceous limestone

• "Cressman (1973) inferred that the Grier Limestone Member was deposited under shallow-water (less than 50 ft deep), well-aerated, but normally low energy subtidal marine conditions." "shallow, well-aerated, mloderately agitated water of normal salinity.
• " [...] 100-180 ft of thin, irregularly bedded, often nodular, very fossiliferous limestone. These limestones contain a diverse marine fauna of brachiopods, bryozoans, and crinoids in coarser grained lithologies and ostracodes, univalved mollusks, and pelecypods in finer grained, more argillaceous lithologies."

Size class: macrofossils

Preservation: replaced with silica

Reposited in the USNM

Collection methods: bulk, acetic,

• " [...] specimens were obtained from bulk rock collections (36,000 pounds (lbs) of limestone) made by USGS field parties in the 1960's and 1970's." This statement not only applies to the Tyrone A locality. For further details on collection methods see p. P22 in the primary reference

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 87818: authorized by Björn Kröger, entered by Torsten Liebrecht on 25.03.2009, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

• see comments on lithology
Gastropoda
 Trochonematoidea - Lophospiridae
Lophospira perangulata1 Hall 1847 snail
 Bellerophontida - Bellerophontidae
Bucanopsis carinifera2 Ulrich and Scofield 1897 snail
Sphenosphaera troosti2 de Ferrusac and d'Orbigny 1840 snail
 Bellerophontida - Bucaniidae
"Bucania nashvillensis" = Loxobucania nashvillensis2, Bucania halli2
"Bucania nashvillensis" = Loxobucania nashvillensis2 Ulrich and Scofield 1897 snail
Bucania halli2 Ulrich and Scofield 1897 snail
 Bellerophontida - Pterothecidae
Carinaropsis cymbula2 Hall 1861 snail
Tergomya
 Cyrtonellida - Cyrtolitidae
"Cyrtolites (Cyrtolites) retrorsus" = Cyrtolites retrorsus2
"Cyrtolites (Cyrtolites) retrorsus" = Cyrtolites retrorsus2 Ulrich and Scofield 1897
 Archinacellida - Archinacellidae
Archinacella simulatrix2 Ulrich and Scofield 1897
Cephalopoda
 Endocerida - Endoceratidae
Cameroceras cf. trentonense Conrad 1842
USNM 468712 (single silicified siphuncle)