Division B Beds, below the lower "Ophileta beds", Section northeast of Shoreham (Ordovician of the United States)

Where: Vermont (43.9° N, 73.3° W: paleocoordinates 31.6° S, 67.1° W)

• outcrop-level geographic resolution

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

• Paraplethopeltis seelyi trilobites zone.

•Stairsian; approximately lower-mid Tremadocian

• group of beds-level stratigraphic resolution

Environment/lithology: lithified, bioturbated, black limestone and lithified, gray dolomite

• Dove-colored limestone, intermingled with light grey dolomite, in massive beds; sometimes for a thickness of twelve or fifteen feet no planes of stratification are discernible. In the lower beds, and in those just above the middle, the dolomite predominates; the middle and upper beds are nearly pure Umestone; other beds show on their weathered surfaces, raised reticulating lines of grey dolomite.

Size class: macrofossils

Reposited in the AMNH, YPM

Primary reference: E. Brainerd and H. M. Seely. 1890. The Calciferous Formation in the Champlain valley. Bulletin of the American Museum of Natural History 3(1):1-24 [P. Wagner/P. Wagner]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 56488: authorized by Pete Wagner, entered by Pete Wagner on 19.11.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Other taxa include:

•Triplesia n. sp. radiata

•Cyrtoceras n. sp. beekmanensis

•However, I cannot find more recent classifications of these species (PJW).

Trilobita
 Proetida - Hystricuridae
"Bathyurus conicus" = Hystricurus conicus
"Bathyurus conicus" = Hystricurus conicus Billings 1859 trilobite
 Proetida - Bathyuridae
"Bathyurus seelyi n. sp." = Bolbocephalus seelyi
"Bathyurus seelyi n. sp." = Bolbocephalus seelyi Whitfield 1889 trilobite
Tergomya
 Archinacellida - Archinacellidae
"Tryblidium pileolum" = Archinacella pileolum
"Tryblidium pileolum" = Archinacella pileolum Whitfield 1889
 Tryblidiida - Tryblidiidae
"Tryblidium acutum" = Proplina acutum
"Tryblidium acutum" = Proplina acutum Whitfield 1889
Gastropoda
 Murchisoniina - Lophospiridae
Lophospira calcifera n. sp. Whitfield 1889 snail
 Murchisoniina - Trochonematidae
Trochonema exile n. sp. Whitfield 1889 snail
 Euomphalina - Ophiletidae
Ecculiomphalus priscus n. sp., "Euomphalus calciferus n. sp." = Eccyliomphalus calciferus
Ecculiomphalus priscus n. sp. Whitfield 1889 snail
"Euomphalus calciferus n. sp." = Eccyliomphalus calciferus Whitfield 1889 snail
Cephalopoda
 Ellesmerocerida - Ellesmeroceratidae
"Cyrtoceras kirbyi n. sp." = Bassleroceras kirbyi
"Cyrtoceras kirbyi n. sp." = Bassleroceras kirbyi Whitfield 1889
 Endocerida - Endoceratidae
"Orthoceras primigenium" = Endoceras primigenium
"Orthoceras primigenium" = Endoceras primigenium Vanuxem 1842