ammonites
USGS 5067-CO. Hillside pasture, west side of US Rte 227. (Ordovician of the United States)

Also known as west side of US Rte 227, 0.4 miles S of Ford-Hampton Rd / US 227 intersection, north of Ford; Grier Ls. Mbr. N of Ford, KY

Where: Clark County, Kentucky (37.9° N, 84.3° W: paleocoordinates 27.6° S, 63.0° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Grier Limestone Member (Lexington Limestone Formation), Shermanian (460.9 - 449.5 Ma)

• "140 ft above the top of the Tyrone Limestone."

• group of beds-level stratigraphic resolution

Environment/lithology: open shallow subtidal; lithified, 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."
• " [...] 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 Ford 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 87813: authorized by Björn Kröger, entered by Torsten Liebrecht on 25.03.2009, edited by Pete Wagner