Lake Simcoe Area, Ontario, Gull River Formation Lower Member (Ordovician of Canada)

Where: Ontario, Canada (44.7° N, 78.8° W: paleocoordinates 24.9° S, 54.8° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: lower Member (Gull River Formation), Blackriveran (457.3 - 449.6 Ma)

• Correlates to the Pamelia Limestone of New York.

• member-level stratigraphic resolution

Environment/lithology: lagoonal or restricted shallow subtidal; dolomitic, gray limestone

• Shallow to deeper lagoonal.
• Fine-grained limestone , lithographic limestone, and fine-grained dolomitic limestone. Commonly gray to greenish-gray.

Size class: macrofossils

Primary reference: B. A. Liberty. 1969. Palaeozoic geology of the Lake Simcoe Area, Ontario. Geological Survey of Canada Memoirs (355)1-201 [S. Holland/T. Hanson/T. Hanson]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 26172: authorized by Steven Holland, entered by Tori Hanson on 07.10.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Tetradium
  -
Tetradium cellulosum
Gastropoda
 Euomphalina - Holopeidae
Holopea cf. concinnula
Holopea cf. concinnula Ulrich and Scofield 1897 snail
 Murchisoniina - Lophospiridae
"Lophospira concinnula" = Eunema concinnula, Lophospira perangulata, Lophospira milleri
"Lophospira concinnula" = Eunema concinnula Ulrich and Scofield 1897 snail
Lophospira perangulata Hall 1847 snail
Lophospira milleri Miller 1877 snail
 Murchisoniina - Hormotomidae
Hormotoma sp.
Hormotoma sp. Salter 1859 snail
Strophomenata
 Strophomenida - Strophomenidae
Strophomena sp., Strophomena cf. minuta
Strophomena sp. Rafinesque and De Blainville 1824
 Strophomenida - Rafinesquinidae
Rafinesquina sp., Rafinesquina cf. trentonensis
Rafinesquina sp. Hall and Clarke 1892
 Strophomenida - Furcitellidae
"Opikina minnesotensis" = Oepikina minnesotensis
"Opikina minnesotensis" = Oepikina minnesotensis Winchell 1881
Trilobita
 Proetida - Bathyuridae
Bathyurus superbus
Bathyurus superbus Raymond 1910 trilobite
 Corynexochida - Illaenidae
Bumastus indeterminatus
Bumastus indeterminatus Walcott 1879 trilobite
Stromatoporoidea
 Labechiida - Aulaceratidae
Cryptophragmus sp., Cryptophragmus cf. gracilis
Cryptophragmus sp. Raymond 1914 stromatoporoid sponge
Cryptophragmus cf. gracilis stromatoporoid sponge