Bottom 30’ of section just east of Smith Basin, Fort Ann (Ordovician of the United States)

Also known as Was: Champlain Valley, Fort Ann Fm., early Arenig, New York

Where: New York (43.9° N, 73.4° W: paleocoordinates 31.5° S, 67.2° W)

• coordinate based on nearby landmark

When: Macerodus dianae conodont zone, Fort Ann Formation, Stairsian (485.4 - 478.6 Ma)

• Given as Demingian in Mazzullo & Friedman, but Jeffersonian on all later charts (PJW3).

•Landing & Westrop (2006 J. Paleo 80:960) give this as Macerodus dianae conodont zone & Paraplethopeltis seelyi faunal zone.

Environment/lithology: peritidal; limestone

• "limestone (mottled algalaminite, some channel) subtidal, very shallow to low intertidal BA1. Stable ocean facing shelf."

Size classes: macrofossils, mesofossils

Primary reference: S. J. Mazzullo and G. M. Friedman. 1977. Competitive algal colonization of peritidal flats in a schizohaline environment; the lower Ordovician of New York. Journal of Sedimentary Petrology 47(1):398-410 [P. Wagner/P. Wagner/P. Wagner]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 289: authorized by Jack Sepkoski, entered by Mike Sommers on 20.11.1998, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

• Mazzullo and Friedman's 1977 list (Table 1) was provided by D.W. Fisher, but he obviously got it from Flower's papers.
 Aulacopleurida - Hystricuridae
Hystricurus cf. conicus Billings 1859 trilobite
Hystricurus sp.
 Pentamerida - Clarkellidae
 Euomphalina - Macluritidae
"Lesueurilla imperfecta n. sp." = Macluritella imperfecta
"Lesueurilla imperfecta n. sp." = Macluritella imperfecta Flower 1968 snail
Lesueurilla sp.
 Euomphalina - Ophiletidae
Lecanospira compacta Salter 1859 snail
Lecanospira sp.; occurs above the other gastropods
 Euomphalina - Raphistomatidae
"Ophileta macroconica n. sp." = Ceratopea canadensis
"Ophileta macroconica n. sp." = Ceratopea canadensis Billings 1865 snail
Ophileta sp.
 Eogastropoda - Sinuopeidae
Euconia sinuata n. sp. Flower 1968 snail
Euconia sp.
 Murchisoniina - Hormotomidae
"Plethospira bilineata n. sp." = Hormotoma bilineata, "Plethospira subangulata n. sp." = Plethospira cassina
"Plethospira bilineata n. sp." = Hormotoma bilineata Flower 1968 snail
Plethospira sp., 2 species
"Plethospira subangulata n. sp." = Plethospira cassina Whitfield 1886 snail
 Ellesmerocerida - Ellesmeroceratidae
Bassleroceras sp. Ulrich and Foerste 1936
 Endocerida - Proterocameroceratidae
Clitendoceras sp. Ulrich and Foerste 1936
Proendoceras sp. Flower 1955
 Tarphycerida - Tarphyceratidae
Campbelloceras sp. Ulrich and Foerste 1936
Seelyoceras sp. Ulrich and Foerste 1936
 Tarphycerida - Estonioceratidae
Aphetoceras sp. Hyatt 1894
? Crinoidea indet. Miller 1821 Sea lily
originally entered as "? Crinoidea indet."