PBDB Collection

227 - Promonotory on west end of Fort Cassin, Lake Champlain. (Ordovician of the United States)

Where: Addison County, Vermont (44.2° N, 73.3° W: paleocoordinates 30.5° S, 61.3° W)

• outcrop-level geographic resolution

When: Oepikodus communis conodont zone, Sciota Member (Fort Cassin Formation), Cassinian (482.3 - 470.0 Ma)

• Has been called Emerson School member, but Brett & Westrop (1996) argue that this is just part of the Sciota member

• formation-level stratigraphic resolution

Environment/lithology: limestone

• WP Rust 1887. “Pure, fine-grained, compact limestone”

Size class: macrofossils

Reposited in the AMNH, USNM

Primary reference: R. P. Whitfield. 1886. Notice of geological investigations along the eastern shore of Lake Champlain, conducted by Prof. H.J. Seely and Pres. Ezra Brainerd, of Middlebury College, with descriptions of the new fossils discovered. Bulletin of the American Museum of Natural History 1(8):24-35 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 154944: authorized by Pete Wagner, entered by Pete Wagner on 21.03.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

• Only gastropods, rostroconchs and tergomyans entered so far, as the taxonomy is badly outdated.

Show authors, comments, and common names

Paragastropoda
Mimospirida - Onychochilidae	"Clisospira lirata n. sp." = Matherella lirata "Clisospira lirata n. sp." = Matherella lirata Whitfield 1886
Tergomya
Scenelloidea - Scenellidae	"Tryblidium conicum n. sp." = Scenella conicum "Tryblidium conicum n. sp." = Scenella conicum Whitfield 1886
Tryblidiida - Tryblidiidae	Tryblidium simplex n. sp., Tryblidium ovale n. sp., Tryblidium ovatum n. sp. Tryblidium simplex n. sp. Whitfield 1886 Tryblidium ovale n. sp. Whitfield 1886 Tryblidium ovatum n. sp. Whitfield 1886
Rostroconchia
Conocardiida - Eopteriidae	"Ribeiria ventricosa n. sp." = Eopteria ventricosa "Ribeiria ventricosa n. sp." = Eopteria ventricosa Whitfield 1886
Ribeirioida - Technophoridae	Ribeiria compressa n. sp. Ribeiria compressa n. sp. Whitfield 1886
Gastropoda
Bellerophontida - Tropidodiscidae	"Bellerophon cassinensis n. sp." = Peruniscus cassinensis "Bellerophon cassinensis n. sp." = Peruniscus cassinensis Whitfield 1886 snail
Euomphalina - Helicotomidae	"Euomphalus circumliratus n. sp." = Lophonema circumlirata "Euomphalus circumliratus n. sp." = Lophonema circumlirata Whitfield 1886 snail
Euomphalina - Holopeidae	"Raphistoma hortensia" = Raphistomina hortensia "Raphistoma hortensia" = Raphistomina hortensia Billings 1865 snail
Euomphalina - Raphistomatidae	"Raphistoma compressum n. sp." = Ceratopea compressum, "Ecculiomphalus volutatus n. sp." = Bridgeites volutatus "Raphistoma compressum n. sp." = Ceratopea compressum Whitfield 1886 snail "Ecculiomphalus volutatus n. sp." = Bridgeites volutatus Whitfield 1886 snail
Euomphalina - Macluritidae	"Maclurea acuminata" = Palliseria acuminata "Maclurea acuminata" = Palliseria acuminata Billings 1865 snail
Euomphalina - Ophiletidae	"Euomphalus perkinsi n. sp." = Malayaspira perkinsi "Euomphalus perkinsi n. sp." = Malayaspira perkinsi Whitfield 1890 snail
Eogastropoda - Sinuopeidae	"Pleurotomaria etna" = Euconia etna "Pleurotomaria etna" = Euconia etna Billings 1865 snail
Murchisoniina - Subulitidae	"Subulites obesus n. sp." = Fusispira obesus, "? Murchisonia (Fusispira) obelisca n. sp." = Eroicaspira obelisca "Subulites obesus n. sp." = Fusispira obesus Whitfield 1886 snail "? Murchisonia (Fusispira) obelisca n. sp." = Eroicaspira obelisca Whitfield 1886 snail
Murchisoniina - Straparollinidae	"Lophospira cassina n. sp." = Straparollina cassina "Lophospira cassina n. sp." = Straparollina cassina Whitfield 1886 snail
Murchisoniina - Hormotomidae	"Holopea cassina n. sp." = Plethospira cassina, "Pleurotomaria difficilis n. sp." = Plethospira difficilis, "? Murchisonia prava n. sp." = Hormotoma prava "Holopea cassina n. sp." = Plethospira cassina Whitfield 1886 snail "Pleurotomaria difficilis n. sp." = Plethospira difficilis Whitfield 1890 snail "? Murchisonia prava n. sp." = Hormotoma prava Whitfield 1886 snail