Smith Basin, Fort Ann (Ordovician of the United States)

Also known as Was Great Meadows Fm., Smith Basin Mbr., Champlain Valley, New York

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

• coordinate based on nearby landmark

When: Paraplethopeltis trilobite zone, Smith Basin Member (Great Meadows Formation), Demingian (485.4 - 478.6 Ma)

• Given as "Lower Ord. (upper late Tremadoc, Gasconadian Stage)" by Mazzullo & Friedman, but Demingian in all later references.

• member-level stratigraphic resolution

Environment/lithology: peritidal; limestone

• "limestone (thrombolites, channels). strandline; intertidal to very shallow subtidal. ocean facing stable shelf"
• "The limstone also contains calcaerous algae, which form hemispherical mases of 2-3" in diameter

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 427: authorized by Jack Sepkoski, entered by Mike Sommers on 08.12.1998, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

• Mazzulo and Friedman's list provided by D.W. Fisher (1974), but is basically Flower's work.
? Leiocorphyge lobata n. sp.2
originally entered as "? Leiocorphye sp."
 Aulacopleurida - Hystricuridae
Paraplethopeltis carinfera n. sp.2 trilobite
Paraplethopeltis sp.
 Ptychopariida - Kingstoniidae
Clelandia sp. Cossman 1902 trilobite
Not in M & F 1977....
 Asaphida - Remopleurididae
? Remopleuridiella obtusa n. sp.2 trilobite
originally entered as "? Remopleuridella sp."
 Orthida - Finkelnburgiidae
Finkelnburgia sp. Walcott 1905
 Euomphalina - Macluritidae
"Prohelicotoma uniangulata" = Macluritella uniangulata2
"Prohelicotoma uniangulata" = Macluritella uniangulata2 Hall 1847 snail
Prohelicotoma sp.
 Eogastropoda - Sinuopeidae
"Rhachopea angulata n. sp." = Schizopea typica2, Sinuopea sp.2, "? Taeniospira naticoides n. sp." = Sinuopea emminencis2
"Rhachopea angulata n. sp." = Schizopea typica2 Ulrich et al. 1931 snail
Rhacopea sp.
Sinuopea sp.2 Ulrich 1911 snail
"? Taeniospira naticoides n. sp." = Sinuopea emminencis2 Ulrich et al. 1931 snail
originally entered as "? Taenospira sp."
 Archinacellida - Archinacellidae
Archinacella magna n. sp.2 Flower 1968
Archinacella sp. 2 species
Archinacella parva n. sp.2 Flower 1968
 Kiringellida - Hypseloconidae
Yochelsonella compressa n. gen. n. sp.2
Yochelsonella compressa n. gen. n. sp.2 Flower 1968
originally entered as "Yocholsonella sp."
 Ellesmerocerida -
? Keraiaceras percostatum1
Keraiaceras sp.; transported?
 Ellesmerocerida - Ellesmeroceratidae
Ectenolites curviseptatus1, "Ectenolites penecilin" = Ectenolites clelandi1, "Ectenolites sinuatus" = Ectenolites sinuatus1, "Ectenolites simplex" = Ectenolites sinuatus1, "Clarkeoceras rhomboidale" = Clarkoceras1, "Clarkeoceras sp." = Clarkoceras1, "Clarkeoceras ruedemanni" = Clarkoceras ruedemanni1, "Annoceras costatum" = Annoceras costatum1, "Ellesmeroceras fusiforme" = Annoceras costatum1, "Eremoceras perseptatum" = Annoceras costatum1, "Ellesmeroceras progressum" = Annoceras costatum1, "Ellesmeroceras angulatum" = Annoceras costatum1, "Eremoceras magnum" = Annoceras costatum1, "Annoceras elevatum" = Annoceras costatum1, "Ellesmeroceras imbricatum" = Annoceras costatum1, Ellesmeroceras indomitum1, Buehleroceras arcuatum1, Buehleroceras infundibulum1, Levisoceras sp.1, ? Eremoceras expansum1, Eremoceras multicameratum1, Walcottoceras sp., Conocerina reducta1
Ectenolites curviseptatus1
Ectenolites sp.; 4 species; transported?
"Ectenolites penecilin" = Ectenolites clelandi1 Ulrich et al. 1944
"Ectenolites sinuatus" = Ectenolites sinuatus1 Flower 1964
"Ectenolites simplex" = Ectenolites sinuatus1 Flower 1964
"Clarkeoceras rhomboidale" = Clarkoceras1
Clarkoceras sp.; 3 species; transported?
"Clarkeoceras sp." = Clarkoceras1 Ruedemann 1905
"Clarkeoceras ruedemanni" = Clarkoceras ruedemanni1 Flower 1964
"Annoceras costatum" = Annoceras costatum1 Flower 1964
Annoceras sp.; 3 species; transported?
"Ellesmeroceras fusiforme" = Annoceras costatum1 Flower 1964
"Eremoceras perseptatum" = Annoceras costatum1 Flower 1964
"Ellesmeroceras progressum" = Annoceras costatum1 Flower 1964
"Ellesmeroceras angulatum" = Annoceras costatum1 Flower 1964
Ellesmeroceras sp.; 5 species; transported?
"Eremoceras magnum" = Annoceras costatum1 Flower 1964
"Annoceras elevatum" = Annoceras costatum1 Flower 1964
"Ellesmeroceras imbricatum" = Annoceras costatum1 Flower 1964
Ellesmeroceras indomitum1 Kröger and Landing 2007
Buehleroceras arcuatum1
Buehleroceras sp.; 2 species; transported?
Levisoceras sp.1 Foerste 1925
? Eremoceras expansum1
Eremoceras sp.; 4 species; transported?
Walcottoceras sp. Ulrich and Foerste 1936
transported?; Not in M & F 1977....
Conocerina reducta1
Conocerina sp.; transported?
 Ellesmerocerida -
Paradakeoceras minor1
Paradakeoceras sp.; 2 species; transported?
Palaeacmaea expansa n. sp.2
originally entered as "Palaeacmaea sp."