West side of road 348, 1.85 miles SW of Chazy village, NY, Crown Point Fm (Ordovician of the United States)

Also known as B3 of Brainerd & Seely (1888) and Ruedemann (1906),=E11 of Raymond (1906), 8-19-E. of Ross (1963)

Where: New York (44.9° N, 73.5° W: paleocoordinates 27.9° S, 54.7° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Crown Point Formation (Chazy Group), Chazy (466.0 - 457.5 Ma)

• "Group B" of the Chazy Formation (Middle Chazy). This would Llandeilo on the old scales.

• formation-level stratigraphic resolution

Environment/lithology: marine; nodular limestone and dolomite

• Details of the divisions at each of the localities from which each specimen listed are not given, thus I will give a complete description of lithologies summarized by Ruedemann for the formation at two different localities. “Section of the Chazy beds at Valcour in ascending order: The Chazy beds at Valcour form a low anticline. B1, a hard, compact, gray limestone, exposed at water edge, on land of Ezra Day. 2 feet of its top exposed. B2, same rock. 6 inches. B3, gray, shaly impure limestone with mud seams; very fossiliferous. 1 foot 4 inches. B4, more crystalline limestone with darker shaly intercalations. 1 foot 10 inches. Contains numerous small bryozoan reefs and other fossils; also many cephalopods in its upper layer (just north of fence diving lands of George and Ezra Day). B5, darker, impure shaly limestone. 1 foot 6 inches. Contains some large nautiloids. B6, a gray shaly limestone, 3 feet, containing a rich fauna (Bolboporites, Malocystites, brachipods, trilobites). B7, series of heavier, dark gray beds with abundant plates of Palaocystites. 7a-10 inches, barren; 7b-14 inches, in lower 3 inches full of trilobites; 7c-3 feet 6 inches, barren; 7c2-8 inches, hard crystalline gray limestone with trilobites. B8, 5 ½ feet of dark shaly limestone, nearly bluish gray and very fossiliferous, containing orthoceracones. Since we can do no better than base our future stratigraphic work on the larger lithologic divisions recognized by Brainerd and Seely in the Beekmantown formation at East shore ham Vt. And in the Chazy formation at Chazy village, we refer the fossils obtained at other places than the Valcour shore provisionally to those divisions.” = Bryozoan biosparrudite

Size classes: macrofossils, mesofossils

Primary reference: R. Ruedemann. 1906. Cephalopoda of the Beekmantown and Chazy formations of the Champlain Basin. Bulletin of the New York State Museum, Paleontology 14:389-611 [P. Wagner/K. Koverman/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 42808: authorized by Pete Wagner, entered by Kimberly Koverman on 05.08.2004, edited by Björn Kröger

Creative Commons license: CC BY (attribution)

Taxonomic list

 Corynexochida - Illaenidae
"Illaenus globosus" = Stenopareia globosus2
"Illaenus globosus" = Stenopareia globosus2 Billings 1859 trilobite
 Phacopida - Pliomeridae
Pliomerops canadensis2 Billings 1859 trilobite
 Orthotetida - Triplesiidae
"Camerella longirostris" = Onychoplecia longirostris2
"Camerella longirostris" = Onychoplecia longirostris2 Billings 1859
 Strophomenida - Rafinesquinidae
"Rafinesquina champlainensis" = Macrocoelia champlainensis2
"Rafinesquina champlainensis" = Macrocoelia champlainensis2 Raymond 1902
 Rhynchonellida - Trigonirhynchiidae
"Camarotoechia pristina" = Rostricellula pristina2
"Camarotoechia pristina" = Rostricellula pristina2 Raymond 1905
 Rhynchonellida - Sphenotretidae
"Zygospira acutirostris" = Sphenotreta acutirostris2
"Zygospira acutirostris" = Sphenotreta acutirostris2 Hall 1847
 Orthida - Plaesiomyidae
"Plaesiomys platys" = Multicostella platys2
"Plaesiomys platys" = Multicostella platys2 Billings 1859
 Euomphalina - Macluritidae
Maclurites magnus2 Le Sueur 1818 snail
 Orthocerida - Proteoceratidae
Stereospyroceras clintoni1, "Ruedemannoceras boycii" = Cyrtactinoceras boycii1
"Ruedemannoceras boycii" = Cyrtactinoceras boycii1 Whitfield 1886
 Endocerida - Cyrtendoceratidae
Cyrtovaginoceras sp.1 Kobayashi 1934
 Actinocerida - Gonioceratidae
Gonioceras brainerdi1 Flower 1957
Gonioceras chaziense Ruedemann 1906
 Trepostomida -
Nicholsonella sp.4 Ulrich 1890
  - Phylloporinidae
Phylloporina sp.5 Foerste 1887
 Cryptostomida -