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An Edgewood-type Hirnantian fauna from the Mackenzie Mountains, northwestern margin of Laurentia

Jin, Jisuo; Harper, David A.T.

An Edgewood-type Hirnantian fauna from the Mackenzie Mountains, northwestern margin of Laurentia Thumbnail


Authors

Jisuo Jin



Abstract

Silicified brachiopods from Hirnantian strata in three sections of the lower Whittaker Formation, Mackenzie Mountains, northwestern Canada, yielded a moderately diverse, Edgewood-type Hirnantian fauna, consisting of 13 species: Biparetis paucirugosus, Brevilamnulella laevis, Dalmanella edgewoodensis, Drabovia noixella, Eospirigerina putilla, Epitomyonia paucitropida, Epitomyonia sekwiensis, Glyptorthis papillosa new species, Gnamptorhynchos orbiculoidea, Katastrophomena mackenzii new species, K. parvicardinis, Parastrophina cf. P. minor, and Skenidioides sp. Compared to the typical Edgewood fauna of the American Midcontinent, Brevilamnulella laevis has a notably smaller shell than B. thebesensis, and is interpreted as a deeper-water form. The strong faunal affinity of the Mackenzie Mountains fauna to the Edgewood-type Hirnantian fauna is indicated by the occurrence of Biparetis, Brevilamnulella, Eospirigerina, and Gnamptorhynchos. In addition to the Edgewood type area within Laurentia, Biparetis, Eospirigerina, and Gnamptorhynchos are characteristic taxa that also occur in the Ellis Bay Formation (Hirnantian) of Anticosti Island. Multivariate and network analyses strongly support the differentiation between an Edgewood-type Hirnantian fauna in Laurentia and peri-Laurentia and the typical Hirnantia fauna of the Kosov Province in Gondwana, peri-Gondwana, South China, Kazakhstan terranes, Avalonia, and Baltica.

Citation

Jin, J., & Harper, D. A. (2024). An Edgewood-type Hirnantian fauna from the Mackenzie Mountains, northwestern margin of Laurentia. Journal of Paleontology, 98(1), 13-39. https://doi.org/10.1017/jpa.2023.87

Journal Article Type Article
Acceptance Date Jan 23, 2024
Online Publication Date Feb 27, 2024
Publication Date Feb 27, 2024
Deposit Date May 22, 2024
Publicly Available Date May 22, 2024
Journal Journal of Paleontology
Print ISSN 0022-3360
Electronic ISSN 1937-2337
Publisher Cambridge University Press
Peer Reviewed Peer Reviewed
Volume 98
Issue 1
Pages 13-39
DOI https://doi.org/10.1017/jpa.2023.87
Public URL https://durham-repository.worktribe.com/output/2456375

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