USGS 6035-CO, Sulphur Well(s), New Watts Mill Rd.; Little Hickman A section (Ordovician of the United States)

Where: Jessamine County, Kentucky (37.8° N, 84.6° W: paleocoordinates 27.5° S, 63.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• measured from base of section

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; intraclastic, peloidal, shelly/skeletal grainstone

• " 'The Tyrone Limestone accumulated in quiet shallow water and was periodically exposed to the air' (Cressman, 1973, p. 13). Cressman and Noger (1976) concluded that the Camp Nelson and Tyrone limestones (High Bridge Group) were deposited in tidal flat and immediate subtidal carbonate environments analogous to those seen today in the Bahamas and Florida Bay." (Hoare & Pojeta, 2006)
• "a hard, white to gray, crystalline fossiliferous limestone unit, 3 ft thick, [...] Petrographically, this limestone would be classified as a biopelsparrudite (classification of Folk, 1962) or a fossiliferous grainstone (classification of Dunham, 1962). The unit contains poorly sorted whole and fragmentaIy silicified shells of nautiloids, gastropods, solitary corals, trepostome bryozoans, and pelecypods, plus intraclasts consisting of sub rounded fragments of micrite, all in a matrix of sand-sized peloidal and skeletal grains." (Frey, 1995)

Size class: macrofossils

Preservation: recrystallized, 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." (Frey, 1995). This statement not only applies to the Little Hickman locality. For further details on collection methods see p. P22 in the primary reference

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: taxonomic analysis

PaleoDB collection 100130: authorized by Pete Wagner, entered by Hallie Street on 30.11.2010, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

• see comments on lithology;

•"The approximate number of identifiable gastropods is 2,500 specimens; however, they have not been studied systematically. Wagner (1990) examined the lophospirids, but he did not publish the results." (Hoare & Pojeta, 2006)

Polyplacophora
 Paleoloricata - Mattheviidae
Spicuchelodes cressmani Hoare and Pojeta 2006 chiton