New pteraspididae (agnatha, heterostraci) from the lower devonian of Northwest Territories, Canada

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Abstract

Three new genera of pteraspidids from Arctic Canada improve the known distribution of the family beyond Europe, Spitsbergen and eastern Canada where they have biostratigraphic value. Stegobranchiaspis baringensis, S. baringensis var. falcata, Unarkaspis schultzei and Escharaspis alata from the Peel Sound, Drake Bay and Snowblind Bay formations of Prince of Wales and Cornwallis Islands, N.W.T., are medium-sized to large pteraspidids with distinctive proportions of probable adaptive significance. Faunas containing these pteraspidids provide a local correlation between the basal Snowblind Bay Formation and upper members of the Peel Sound and Drake Bay formations. Associated conodonts indicate a late Gedinnian to Siegenian age for the fauna, and comparison with successions elsewhere suggests an equivalence with the "vogti" horizon in Spitsbergen and the "crouchi" zone of the Anglo-Welsh succession.

Original languageEnglish (US)
Pages (from-to)389-406
Number of pages18
JournalJournal of Vertebrate Paleontology
Volume2
Issue number4
DOIs
StatePublished - 1983

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fauna
new genus
distribution
family
Europe
comparison

ASJC Scopus subject areas

  • Palaeontology

Cite this

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title = "New pteraspididae (agnatha, heterostraci) from the lower devonian of Northwest Territories, Canada",
abstract = "Three new genera of pteraspidids from Arctic Canada improve the known distribution of the family beyond Europe, Spitsbergen and eastern Canada where they have biostratigraphic value. Stegobranchiaspis baringensis, S. baringensis var. falcata, Unarkaspis schultzei and Escharaspis alata from the Peel Sound, Drake Bay and Snowblind Bay formations of Prince of Wales and Cornwallis Islands, N.W.T., are medium-sized to large pteraspidids with distinctive proportions of probable adaptive significance. Faunas containing these pteraspidids provide a local correlation between the basal Snowblind Bay Formation and upper members of the Peel Sound and Drake Bay formations. Associated conodonts indicate a late Gedinnian to Siegenian age for the fauna, and comparison with successions elsewhere suggests an equivalence with the {"}vogti{"} horizon in Spitsbergen and the {"}crouchi{"} zone of the Anglo-Welsh succession.",
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T1 - New pteraspididae (agnatha, heterostraci) from the lower devonian of Northwest Territories, Canada

AU - Elliott, David K

PY - 1983

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N2 - Three new genera of pteraspidids from Arctic Canada improve the known distribution of the family beyond Europe, Spitsbergen and eastern Canada where they have biostratigraphic value. Stegobranchiaspis baringensis, S. baringensis var. falcata, Unarkaspis schultzei and Escharaspis alata from the Peel Sound, Drake Bay and Snowblind Bay formations of Prince of Wales and Cornwallis Islands, N.W.T., are medium-sized to large pteraspidids with distinctive proportions of probable adaptive significance. Faunas containing these pteraspidids provide a local correlation between the basal Snowblind Bay Formation and upper members of the Peel Sound and Drake Bay formations. Associated conodonts indicate a late Gedinnian to Siegenian age for the fauna, and comparison with successions elsewhere suggests an equivalence with the "vogti" horizon in Spitsbergen and the "crouchi" zone of the Anglo-Welsh succession.

AB - Three new genera of pteraspidids from Arctic Canada improve the known distribution of the family beyond Europe, Spitsbergen and eastern Canada where they have biostratigraphic value. Stegobranchiaspis baringensis, S. baringensis var. falcata, Unarkaspis schultzei and Escharaspis alata from the Peel Sound, Drake Bay and Snowblind Bay formations of Prince of Wales and Cornwallis Islands, N.W.T., are medium-sized to large pteraspidids with distinctive proportions of probable adaptive significance. Faunas containing these pteraspidids provide a local correlation between the basal Snowblind Bay Formation and upper members of the Peel Sound and Drake Bay formations. Associated conodonts indicate a late Gedinnian to Siegenian age for the fauna, and comparison with successions elsewhere suggests an equivalence with the "vogti" horizon in Spitsbergen and the "crouchi" zone of the Anglo-Welsh succession.

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