Lower Triassic conodonts from the Canadian Arctic, their intercalibration with ammonoid-based stages and a comparison with other North American Olenekian faunas
Conodont faunas are described from the type sections of Lower Triassic stages in the Canadian Arctic. The collections come largely from ammonoid-bearing strata of the Strigatus (upper Griesbachian), Candidus (lower Dienerian), Romunduri and Tardus (lower and upper Smithian), and Subrobustus (upper S...
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Norwegian Polar Institute
2008
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ftjpolarres:oai:journals.openacademia.net:article/2897 2023-05-15T14:36:56+02:00 Lower Triassic conodonts from the Canadian Arctic, their intercalibration with ammonoid-based stages and a comparison with other North American Olenekian faunas Orchard, Michael J. 2008-12-01 application/pdf https://polarresearch.net/index.php/polar/article/view/2897 https://doi.org/10.3402/polar.v27i3.6187 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/2897/6524 https://polarresearch.net/index.php/polar/article/view/2897 doi:10.3402/polar.v27i3.6187 Copyright (c) 2018 Polar Research Polar Research; Vol. 27 No. 3 (2008): Special issue: The Boreal Triassic; 393-412 1751-8369 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2008 ftjpolarres https://doi.org/10.3402/polar.v27i3.6187 2021-11-11T19:13:21Z Conodont faunas are described from the type sections of Lower Triassic stages in the Canadian Arctic. The collections come largely from ammonoid-bearing strata of the Strigatus (upper Griesbachian), Candidus (lower Dienerian), Romunduri and Tardus (lower and upper Smithian), and Subrobustus (upper Spathian) zones. These demonstrate that diverse late Griesbachian conodont faunas included the first species of Borinella, Neospathodus and Scythogondolella, accompanied by several species of Neogondolella. Dienerian faunas are dominated by Neospathodus, but explosive radiation led to several Smithian Scythogondolella species and diverse cosmopolitan “neospathodid” species of Conservatella, Discretella and Neospathodus. Smithian Paullella (nomen novum) and Wapitiodus are recorded here for the first time in the Arctic collections, and emphasize the correlation with successions in the Western Canada Sedimentary Basin (WCSB) and in the western USA. Conodonts from the Romunduri Zone differ in the three regions: Conservatella, Discretella and Paullella are rare in the Arctic, are more common in WCSB and are most common in the USA; Scythogondolella species are common in the Arctic, less so in WCSB and are virtually absent in the USA. Conodonts from the Tardus Zone, both in the Arctic and elsewhere, contain cosmopolitan Borinella buurensis, Neospathodus waageni, Scythogondolella mosheri and Scythogondolella milleri. Spathian conodont faunas from the Subrobustus Zone are dominated by Neogondolella species, which also occur in the WCSB associated with Triassospathodus. These two genera have an inverse relationship: Triassospathodus dominates the USA successions, and is virtually absent in the Arctic. Scythogondolella ellesmerensis sp. nov. and Scythogondolella lachrymiformis sp. nov. are described. Article in Journal/Newspaper Arctic Polar Research Polar Research (E-Journal) Arctic Canada Polar Research 27 3 |
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Open Polar |
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Polar Research (E-Journal) |
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ftjpolarres |
language |
English |
description |
Conodont faunas are described from the type sections of Lower Triassic stages in the Canadian Arctic. The collections come largely from ammonoid-bearing strata of the Strigatus (upper Griesbachian), Candidus (lower Dienerian), Romunduri and Tardus (lower and upper Smithian), and Subrobustus (upper Spathian) zones. These demonstrate that diverse late Griesbachian conodont faunas included the first species of Borinella, Neospathodus and Scythogondolella, accompanied by several species of Neogondolella. Dienerian faunas are dominated by Neospathodus, but explosive radiation led to several Smithian Scythogondolella species and diverse cosmopolitan “neospathodid” species of Conservatella, Discretella and Neospathodus. Smithian Paullella (nomen novum) and Wapitiodus are recorded here for the first time in the Arctic collections, and emphasize the correlation with successions in the Western Canada Sedimentary Basin (WCSB) and in the western USA. Conodonts from the Romunduri Zone differ in the three regions: Conservatella, Discretella and Paullella are rare in the Arctic, are more common in WCSB and are most common in the USA; Scythogondolella species are common in the Arctic, less so in WCSB and are virtually absent in the USA. Conodonts from the Tardus Zone, both in the Arctic and elsewhere, contain cosmopolitan Borinella buurensis, Neospathodus waageni, Scythogondolella mosheri and Scythogondolella milleri. Spathian conodont faunas from the Subrobustus Zone are dominated by Neogondolella species, which also occur in the WCSB associated with Triassospathodus. These two genera have an inverse relationship: Triassospathodus dominates the USA successions, and is virtually absent in the Arctic. Scythogondolella ellesmerensis sp. nov. and Scythogondolella lachrymiformis sp. nov. are described. |
format |
Article in Journal/Newspaper |
author |
Orchard, Michael J. |
spellingShingle |
Orchard, Michael J. Lower Triassic conodonts from the Canadian Arctic, their intercalibration with ammonoid-based stages and a comparison with other North American Olenekian faunas |
author_facet |
Orchard, Michael J. |
author_sort |
Orchard, Michael J. |
title |
Lower Triassic conodonts from the Canadian Arctic, their intercalibration with ammonoid-based stages and a comparison with other North American Olenekian faunas |
title_short |
Lower Triassic conodonts from the Canadian Arctic, their intercalibration with ammonoid-based stages and a comparison with other North American Olenekian faunas |
title_full |
Lower Triassic conodonts from the Canadian Arctic, their intercalibration with ammonoid-based stages and a comparison with other North American Olenekian faunas |
title_fullStr |
Lower Triassic conodonts from the Canadian Arctic, their intercalibration with ammonoid-based stages and a comparison with other North American Olenekian faunas |
title_full_unstemmed |
Lower Triassic conodonts from the Canadian Arctic, their intercalibration with ammonoid-based stages and a comparison with other North American Olenekian faunas |
title_sort |
lower triassic conodonts from the canadian arctic, their intercalibration with ammonoid-based stages and a comparison with other north american olenekian faunas |
publisher |
Norwegian Polar Institute |
publishDate |
2008 |
url |
https://polarresearch.net/index.php/polar/article/view/2897 https://doi.org/10.3402/polar.v27i3.6187 |
geographic |
Arctic Canada |
geographic_facet |
Arctic Canada |
genre |
Arctic Polar Research |
genre_facet |
Arctic Polar Research |
op_source |
Polar Research; Vol. 27 No. 3 (2008): Special issue: The Boreal Triassic; 393-412 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/2897/6524 https://polarresearch.net/index.php/polar/article/view/2897 doi:10.3402/polar.v27i3.6187 |
op_rights |
Copyright (c) 2018 Polar Research |
op_doi |
https://doi.org/10.3402/polar.v27i3.6187 |
container_title |
Polar Research |
container_volume |
27 |
container_issue |
3 |
_version_ |
1766309462911483904 |