Anticosti Island, Southwest Point, Chicotte Formation (Silurian of Canada)

Where: Québec, Canada (49.4° N, 63.6° W: paleocoordinates 21.1° S, 35.7° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Icriodella inconstans zone, Chicotte Formation (Anticosti Group), Alexandrian (443.4 - 436.0 Ma)

• formation-level stratigraphic resolution

Environment/lithology: gray grainstone and gray, argillaceous grainstone

• Environmental call by T. Hanson.
• "[M]assive- to thick-bedded, light grey, coarse, crinoidal grainstone and interbeds of medium-bedded, green-grey, argillaceous crinoidal grainstone that tend to be recessive in the cliff faces and less common toward the top of the section." Locally cross-stratified.

Size class: macrofossils

Collection methods: Collection composed almost entirely of encrinite debris but with some brachiopods and rarer corals and stromatoporids.

Primary reference: C. R. Barnes, A. A. Petryk, and T. E. Bolton. 1981. Anticosti Island, Québec. In P. J. Lespérance (ed.), Field meeting, Anticosti-Gaspé, Québec, 1981: IUGS Subcommssion on Silurian Stratigraphy, Ordovician-Silurian Boundary Working Group Guidebook 1:1-24 [S. Holland/T. Hanson/S. Bruning]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 24442: authorized by Steven Holland, entered by Tori Hanson on 07.08.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Periechocrinites sp., Pseudospharexochus canadensis
Trilobita
 Corynexochida - Illaenidae
Stenopareia sp.
Stenopareia sp. Holm 1886 trilobite
Gastropoda
 Euomphalina - Platyceratidae
Cyclonema sp., Platyceras sp.
Cyclonema sp. Hall 1852 snail
Platyceras sp. Conrad 1840 snail
 Bellerophontida - Bucaniidae
Salpingostoma sp.
Salpingostoma sp. Roemer 1876 snail
Bivalvia
 Myalinida - Ambonychiidae
Ambonychia sp.
Ambonychia sp. Hall 1847 clam
Rhynchonellata
 Spiriferida - Cyrtiidae
Eospirifer radiatus, Cyrtia myrtea
Eospirifer radiatus Sowerby 1834
 Pentamerida - Stricklandiidae
Costistricklandia sp.
Crinoidea
 Monobathrida - Eucalyptocrinitidae
Eucalyptocrinites sp.
Eucalyptocrinites sp. Goldfuss 1831 Sea lily
Anthozoa
 Cystiphyllida - Tryplasmatidae
Porpites sp.
Porpites sp. Schlotheim 1820 horn coral