Quadrithyris Zone Near-Reef Brachiopods, Bathurst Island (Devonian of Canada)

Where: Nunavut, Canada (75.8° N, 98.4° W: paleocoordinates 2.2° S, 26.5° W)

• coordinate stated in text

• local area-level geographic resolution

When: Stuart Bay Formation, Lochkovian (419.2 - 410.8 Ma)

• Author considers fauna to be correlative with Quadrithyris Zone of Nevada. This is interpreted as Late Lochkovian by Johnson (1975, PBDB ref. 7311).

• group of beds-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; siltstone and limestone

• Reef thought to be shallow water, fairly high energy.

•SEP: this is a tough one. The unit is definitely clastic dominated and contains only minor carbonate away from the reefs. This environment is probably above normal wave base, relatively near a sed source but sufficiently far out in the cratonic basin to be relatively starved of clastic sediments, which are probably transported into basin primarily during storms. it is also likely to be part of the TST; for all of these reasons, I have assigned it a lower shorface DEPTH.

• "from thin carbonate beds within a siltstone and shale sequence constituting the lateral equivalents of reefs...[Reefs] lie within the Stuart Bay Formation, a unit composed dominantly of calcareous sandstone, shales, siltstones, and minor carbonates...The reefs are composed entirely of limestones, are devoid of bedding...Approximately 200 ft. south of the southernmost reef pinnacle of the western reefrow, exposures of siltstone and shale contain a few limestone beds. These limestone beds yield [the fossils]."

Primary reference: A. C. Lenz. 1973. Quadrithyris Zone (Lower Devonian) near-reef brachiopods from Bathurst Island, arctic Canada; with a description of a new rhynchonellid brachiopod Franklinella. Canadian Journal of Earth Sciences 10:1403-1409 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 26653: authorized by Michael Foote, entered by Michael Foote on 21.10.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

• Author reports brachiopods.
Strophomenata
 Orthotetida - Areostrophiidae
 Strophomenida -
Strophochonetes sp. Muir-Wood 1962
 Strophomenida - Chonetidae
Chonetes sp. Fischer de Waldheim 1830
 Strophomenida - Amphistrophiidae
Mesodouvillina sp. Williams 1950
 Strophomenida - Leptostrophiidae
? Brachyprion sp. Shaler 1865
Rhynchonellata
 Rhynchonellida - Camarotoechiidae
 Orthida - Hesperorthidae
"Dolerorthis" sp. Schuchert and Cooper 1931
 Orthida - Rhipidomellidae
Dalejina sp. Havlicek 1953
 Orthida - Dalmanellidae
Protocortezorthis aff. fornicatimcurvata
corrected from "fornicatumcurvata"
 Orthida - Schizophoriidae
Schizophoria sp. King 1850
 Orthida - Draboviidae
 Protorthida - Skenidiidae
Skenidioides sp. Schuchert and Cooper 1931
 Atrypida - Septatrypidae
"? Dubaria sp." = Septatrypa
"? Dubaria sp." = Septatrypa Kozlowski 1929
 Atrypida - Atrypinidae
Spirigerina sp. d'Orbigny 1849
of the supramarginalis type
 Atrypida - Atrypidae
Atrypa sp. Dalman 1828
 Pentamerida - Gypidulidae
Gypidula sp. Hall 1867
 Spiriferinida - Cyrtinidae
Cyrtina sp. Davidson 1858
 Spiriferida - Ambocoeliidae
 Spiriferida - Reticulariidae
 Athyridida - Athyrididae
 Athyridida - Nucleospiridae
Nucleospira sp. Hall 1859
Ostracoda
 Myodocopida - Entomozoidae
Franklinella pedderi n. gen. n. sp.
Franklinella pedderi n. gen. n. sp. ostracod