USGS 6034-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)

• upper half of the Tyrone Limestone, "25 ft (8 m) below the Pencil Cave bentonite" [...] "112 ft above the base of section." (Frey, 1995)

• 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: 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 87737: authorized by Björn Kröger, entered by Torsten Liebrecht on 23.03.2009, 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)

Ostracoda indet.1 Latreille 1802 ostracod
number of specimens not counted
 Pentamerida - Camerellidae
Camerella sp.1 Billings 1859
"identified by R. B. Neumann", number of specimens not counted
 Cyrtodontida - Cyrtodontidae
Vanuxemia gibbosa1 clam
Vanuxemia sp.1 Billings 1858 clam
Cyrtodonta subovata1 clam
 Myalinida - Ambonychiidae
Cleionychia sp.1 Ulrich 1892 clam
 Trochonematoidea - Trochonematidae
Trochonema canadensis2 Ulrich and Scofield 1897 snail
Trochonemella aff. notablis2 Ulrich and Scofield 1897 snail
Trochonemella n. sp. A
 Trochonematoidea - Lophospiridae
Eunema helicteres2 Salter 1859 snail
 Euomphalina - Holopeidae
Raphistomina lapicida3 Salter 1859 snail
 Euomphalina - Helicotomidae
Helicotoma planulatoides3 Ulrich and Scofield 1897 snail
 Euomphalina - Raphistomatidae
Scalites peracutum3 Ulrich and Scofield 1897 snail
 Bellerophontida - Bucaniidae
Salpingostoma kentuckyense4 Ulrich and Scofield 1897 snail
 Bellerophontida - Pterothecidae
Pterotheca expansa4 Emmons 1842 snail
 Murchisoniina - Eotomariidae
Liospira decipens4 Ulrich and Scofield 1897 snail
 Murchisoniina - Hormotomidae
Hormotoma gracilis2 Hall 1847 snail
 Orthocerida - Kionoceratidae
? Polygrammoceras sp. Foerste 1927
"Polygrammoceras sp. B", USNM 468711
 Orthocerida - Proteoceratidae
Monomuchites annularis n. sp. Frey 1995
USNM 158630, 158671 (paratypes), 158674 (holotype), 158675, 158676, 468716 (suite of specimens)
Monomuchites cf. costalis Wilson 1961
USNM 158667, 158672, 468705, 468706
Monomuchites obliquum n. sp. Frey 1995
USNM 158643, 158648 (both are paratypes), 158653 (holotype)
Proteoceras tyronensis Foerste 1912
USNM 158629, 468686-468689, 468690 (suite of 10 specimens)
 Orthocerida - Orthoceratidae
Pojetoceras floweri n. gen. n. sp.
Pojetoceras floweri n. gen. n. sp. Frey 1995
USNM 468676 (holotype), 468677-468684 (all are paratypes), 468685 (suite of fragmentary specimens)
 Barrandeocerida - Plectoceratidae
Plectoceras cf. carletonense Foerste 1933
USNM 158651 + additional fragmentary material
 Endocerida - Endoceratidae
Vaginoceras sp. Hyatt 1884
"Vaginoceras sp. A"; USNM 158652, 158668, 468714, 468715 (suite of 4 specimens)
 Actinocerida - Actinoceratidae
Actinoceras altopontense Foerste and Teichert 1930
USNM 158640 to 158642, 158646, 158648
Actinoceras kentuckiense Foerste and Teichert 1930
USNM 158647, 158670, 158720
 Actinocerida - Ormoceratidae
Ormoceras ferecentricum Foerste and Teichert 1930
USNM 158639, 468721
 Oncocerida - Oncoceratidae
Laphamoceras cf. scofieldi Foerste 1932
USNM 158654, 158663, 158655, 158664, + four uncataloged specimens
Maelonoceras cf. praematurum Billings 1860
USNM 158649, 468735
Beloitoceras cf. huronense Billings 1865
USNM 158666, 468733, USNM 468729 (suite of specimens)
Oncoceras major n. sp. Frey 1995
USNM 158665 (type)
 Orthoceratoidea - Sactorthoceratidae
Murrayoceras cf. murrayi Billings 1857
USNM 158637, 468672-468675
Cartersoceras shideleri Flower 1964
USNM 158627, 158631, 158633, 158635, 468656-468661, 468662 (suite of 14 specimens)
Cartersoceras popei n. sp. Frey 1995
USNM 158624 (paratype),158625 (holotype), 158632, 468663, 468664 (all three are paratypes), 468665 (suite of 5 specimens)
 Septemchitonida - Alastegiidae
Amblytochiton incomptus n. sp.1 Hoare and Pojeta 2006 chiton
9 intermediate plates: USNM 523946, 523948-523955, 523957 (all are paratypes); 1 head plate: USNM 523947 (paratype); 1 tail plate: USNM 523956 (holotype)
 Paleoloricata - Mattheviidae
Spicuchelodes cressmani1 Hoare and Pojeta 2006 chiton
USNM 523875–523882 (all are individual intermediate plates), 523888B (specimen comprises a total of 71 intermediate plates); all are paratypes
 Stauriida - Lambelasmatidae
? Lambeophyllum sp.1 Okulitch 1938 horn coral
number of specimens not counted
Tetradium sp.1 Dana 1846
number of specimens not counted