Champlain Valley, Fort Cassin Fm., "Cassian Stage," (Ordovician of the United States)

Where: New York (43.9° N, 73.4° W: paleocoordinates 31.2° S, 64.7° W)

• coordinate based on nearby landmark

When: Sciota Member (Fort Cassin Formation), Early/Lower Ordovician (485.4 - 470.0 Ma)

• "L. Ord. overlies Fort Ann Fm."

Environment/lithology: shallow subtidal; dolomitic, gray limestone

• "med. to dark gray dolomitic ls w/ lighter gray coarse calcarenite lenses and interbedded tan-weathering fine-grained dolostone. nearshore (?BA1-2) more offshore than Fort Ann (BA2)."

Size class: macrofossils

Primary reference: D. W. Fisher. 1982. Cambrian and Ordovician stratigraphy and paleontology of the Champlain Valley. In Y. Globensky (ed.), 3rd N.Am. Paleontological Convention Field Trips Guidebook, Montreal, Quebec A1-A28 [M. Uhen/J. Ju/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 290: authorized by Jack Sepkoski, entered by Mike Sommers on 20.11.1998

Creative Commons license: CC BY (attribution)

Taxonomic list

• "D.W.Fisher 1982. Camb and Ord strat and paleon of the Champlain Valley ppA1-A28. in Y. Globensky (ed) 3rd N.Am. Paleont. Conv Field Trips Guidebook, Montreal, Quebec."
Trilobita
 Asaphida - Asaphidae
Isoteloides sp. Raymond 1910 trilobite
 Proetida - Bathyuridae
Bolbocephalus sp. Whitfield 1890 trilobite
Ostracoda
 Leperditicopida - Leperditiidae
"Isochilina sp." = Leperditia (Isochilina)
"Isochilina sp." = Leperditia (Isochilina) Jones 1858 ostracod
Rhynchonellata
 Orthida -
Orthida indet. Schuchert and Cooper 1932
22 genera
Gastropoda
 Archaeogastropoda -
? Archaeogastropoda indet. Thiele 1925 snail
originally entered as "? Archaeogastropoda indet."
 Murchisoniina - Hormotomidae
Hormotoma sp. Salter 1859 snail
originally entered as "Hormotona sp."
Cephalopoda
 Nautiloidea -
Nautiloidea indet. Agassiz 1847 nautiloid
 Tarphycerida - Tarphyceratidae
Tarphyceras sp. Hyatt 1894
Eurystomites sp. Schröder 1891
Conodonta
  -
Conodonta indet. Eichenberg 1930 conodont