ammonites
USGS 6138-CO. Route 52 east of Balls Branch Run crossing (Ordovician of the United States)

Where: Boyle County, Kentucky (37.6° N, 84.7° W: paleocoordinates 27.5° S, 63.5° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Belodina confluens conodont zone, Perryville Limestone Member (Lexington Limestone Formation), Chatfieldian (460.9 - 449.5 Ma)

• "16 ft above Perryville Limestone Member-Tanglewood Limestone Member contact."

Environment/lithology: shallow subtidal; lithified, fine-grained, nodular limestone

• "The Cornishville Bed was deposited in an environment similar to that of the Grier Limestone Member."
• "2 to 10 ft thick and consists of mostly nodular bedded calcisiltite and fine-grained calcarenite containing abundant brachiopods and some bryozoans. The unit resembles the Grier Limestone Member and may be a tongue of that unit."

Size class: macrofossils

Preservation: replaced with silica

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 100234: authorized by Pete Wagner, entered by Hallie Street on 02.12.2010