Glassia Skenidioides Community from the upper Whittaker Fm., Avalanche Lake area (Silurian of Canada)

Where: Northwest Territories, Canada (62.0° N, 127.0° W: paleocoordinates 6.0° N, 51.2° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Whittaker Formation, Wenlock (433.4 - 427.4 Ma)

• Upper Whittaker Formation ("Probably Upper Wenlock").

• bed-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; limestone

• "The community occurs in an area in which basin margin carbonates interfinger with basinal graptolite-bearing shales. The community setting is typical of the somewhat younger basin-slope deposits common in the northern Cordillera, such as in the Royal Creek and Sekwi areas. The shallow end of BA 4-5 is suggested."

•SEP environmental call based on given information

• "...a single 10 m thick limestone band..."

•From Over and Chatterton (1987--PBDB ref. 7002), for Whittaker Formation in general: "The dominant lithologies are dark fine-grained limestone, commonly argillaceous and sparry, and dolomitic chert."

Collection methods: Percent abundances given for brachiopods. Diverse trilobites mentioned but not listed (references to relevant work are given).

Primary reference: A. C. Lenz. 1999. Wenlockian to Pragian brachiopod communities of the northern Canadian Cordillera. In A. J. Boucot and J. D. Lawson (eds.), Paleocommunities--a case study from the Silurian and Lower Devonian 784-792 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 24930: authorized by Michael Foote, entered by Michael Foote on 23.08.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Strophomenata
 Orthotetida - Chilidiopsidae
? Fardenia sp. Lamont 1935
 Strophomenida - Sowerbyellidae
Plectodonta sp. Kozlowski 1929
Eoplectodonta sp. Kozlowski 1929
 Strophomenida - Aegiromenidae
 Strophomenida - Rafinesquinidae
Leptaena sp. Dalman 1828
Rhynchonellata
 Athyridida - Dayiidae
? Protozeuga sp. Twenhofel 1914
 Athyridida - Meristidae
Merista sp. Suess 1851
 Athyridida - Nucleospiridae
Nucleospira sp. Hall 1859
 Spiriferida - Cyrtiidae
? Cyrtia sp. Dalman 1828
Eospirifer sp. Schuchert 1913
Janius cf. exsul Barrande 1848
 Spiriferida - Ambocoeliidae
 Spiriferida - Reticulariidae
? Spirinella sp. Johnston 1941
 Pentamerida - Gypidulidae
? Gypidula sp. Hall 1867
 Pentamerida - Subrianidae
 Protorthida - Skenidiidae
Skenidioides sp. Schuchert and Cooper 1931
 Atrypida - Atrypidae
Atrypa sp. Dalman 1828
 Atrypida - Glassiidae
 Rhynchonellida - Trigonirhynchiidae
 Orthida - Draboviidae
Salopina sp. Boucot 1960
 Orthida - Dicoelosiidae
Dicoelosia parvifrons Johnson et al. 1976
Epitomyonia cf. clausula Johnson et al. 1976
 Orthida - Dalmanellidae
Isorthis sp. Kozlowski 1929
 Orthida - Hesperorthidae
Ptychopleurella sp. Schuchert and Cooper 1931