Atrypoidea zonation of the Upper Silurian Read Bay Formation of Somerset and Cornwallis Islands, Arctic Canada
Species of the brachiopod genus Atrypoidea have a distinct distribution in carbonate rocks of the late Silurian Read Bay Formation of Arctic Canada. Atrypoidea phoca occurs in the basal part of the formation and this species is succeeded by Atrypoidea foxi forma B at higher levels. The ranges of the...
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Canadian Science Publishing
1979
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Online Access: | http://dx.doi.org/10.1139/e79-208 http://www.nrcresearchpress.com/doi/pdf/10.1139/e79-208 |
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crcansciencepubl:10.1139/e79-208 2023-12-17T10:25:35+01:00 Atrypoidea zonation of the Upper Silurian Read Bay Formation of Somerset and Cornwallis Islands, Arctic Canada Jones, Brian 1979 http://dx.doi.org/10.1139/e79-208 http://www.nrcresearchpress.com/doi/pdf/10.1139/e79-208 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 16, issue 12, page 2204-2218 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1979 crcansciencepubl https://doi.org/10.1139/e79-208 2023-11-19T13:38:11Z Species of the brachiopod genus Atrypoidea have a distinct distribution in carbonate rocks of the late Silurian Read Bay Formation of Arctic Canada. Atrypoidea phoca occurs in the basal part of the formation and this species is succeeded by Atrypoidea foxi forma B at higher levels. The ranges of the two species overlap, defining a third useful zone. Locally, as in the Pressure Point area of northwestern Somerset Island, Atrypoidea foxi forma B is succeeded by Atrypoidea foxi forma A. Atrypoidea foxi forma A is generally restricted to carbonates with a low content of detrital material and has a significantly larger shell than Atrypoidea foxi forma B. A higher zone is defined by Atrypoidea erebus which occurs in the basal part of the Somerset Island Formation on Somerset Island and in the basal part of member C of the Read Bay Formation at Goodsir Creek on Cornwallis Island. At the latter locality, Atrypoidea foxi forma A is found with Atrypoidea erebus, thereby demonstrating their overlapping ranges.The overlapping ranges of Atrypoidea phoca and Atrypoidea foxi forma B occur in the middle to late Ludlovian ploeckensis–siluricus conodont zones. On Somerset Island, Atrypoidea foxi forma B and Atrypoidea foxi forma A range through the ploeckensis–siluricus conodont zone. Atrypoidea erebus occurs in late Ludlovian and (or) early Pridolian strata. Article in Journal/Newspaper Arctic Cornwallis Island Somerset Island Canadian Science Publishing (via Crossref) Arctic Canada Cornwallis ENVELOPE(-54.464,-54.464,-61.072,-61.072) Somerset Island ENVELOPE(-93.500,-93.500,73.251,73.251) Read Bay ENVELOPE(-93.584,-93.584,75.052,75.052) Pressure Point ENVELOPE(-95.301,-95.301,73.985,73.985) Goodsir Creek ENVELOPE(-93.401,-93.401,74.835,74.835) Cornwallis Island ENVELOPE(-95.001,-95.001,75.135,75.135) Canadian Journal of Earth Sciences 16 12 2204 2218 |
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Open Polar |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Jones, Brian Atrypoidea zonation of the Upper Silurian Read Bay Formation of Somerset and Cornwallis Islands, Arctic Canada |
topic_facet |
General Earth and Planetary Sciences |
description |
Species of the brachiopod genus Atrypoidea have a distinct distribution in carbonate rocks of the late Silurian Read Bay Formation of Arctic Canada. Atrypoidea phoca occurs in the basal part of the formation and this species is succeeded by Atrypoidea foxi forma B at higher levels. The ranges of the two species overlap, defining a third useful zone. Locally, as in the Pressure Point area of northwestern Somerset Island, Atrypoidea foxi forma B is succeeded by Atrypoidea foxi forma A. Atrypoidea foxi forma A is generally restricted to carbonates with a low content of detrital material and has a significantly larger shell than Atrypoidea foxi forma B. A higher zone is defined by Atrypoidea erebus which occurs in the basal part of the Somerset Island Formation on Somerset Island and in the basal part of member C of the Read Bay Formation at Goodsir Creek on Cornwallis Island. At the latter locality, Atrypoidea foxi forma A is found with Atrypoidea erebus, thereby demonstrating their overlapping ranges.The overlapping ranges of Atrypoidea phoca and Atrypoidea foxi forma B occur in the middle to late Ludlovian ploeckensis–siluricus conodont zones. On Somerset Island, Atrypoidea foxi forma B and Atrypoidea foxi forma A range through the ploeckensis–siluricus conodont zone. Atrypoidea erebus occurs in late Ludlovian and (or) early Pridolian strata. |
format |
Article in Journal/Newspaper |
author |
Jones, Brian |
author_facet |
Jones, Brian |
author_sort |
Jones, Brian |
title |
Atrypoidea zonation of the Upper Silurian Read Bay Formation of Somerset and Cornwallis Islands, Arctic Canada |
title_short |
Atrypoidea zonation of the Upper Silurian Read Bay Formation of Somerset and Cornwallis Islands, Arctic Canada |
title_full |
Atrypoidea zonation of the Upper Silurian Read Bay Formation of Somerset and Cornwallis Islands, Arctic Canada |
title_fullStr |
Atrypoidea zonation of the Upper Silurian Read Bay Formation of Somerset and Cornwallis Islands, Arctic Canada |
title_full_unstemmed |
Atrypoidea zonation of the Upper Silurian Read Bay Formation of Somerset and Cornwallis Islands, Arctic Canada |
title_sort |
atrypoidea zonation of the upper silurian read bay formation of somerset and cornwallis islands, arctic canada |
publisher |
Canadian Science Publishing |
publishDate |
1979 |
url |
http://dx.doi.org/10.1139/e79-208 http://www.nrcresearchpress.com/doi/pdf/10.1139/e79-208 |
long_lat |
ENVELOPE(-54.464,-54.464,-61.072,-61.072) ENVELOPE(-93.500,-93.500,73.251,73.251) ENVELOPE(-93.584,-93.584,75.052,75.052) ENVELOPE(-95.301,-95.301,73.985,73.985) ENVELOPE(-93.401,-93.401,74.835,74.835) ENVELOPE(-95.001,-95.001,75.135,75.135) |
geographic |
Arctic Canada Cornwallis Somerset Island Read Bay Pressure Point Goodsir Creek Cornwallis Island |
geographic_facet |
Arctic Canada Cornwallis Somerset Island Read Bay Pressure Point Goodsir Creek Cornwallis Island |
genre |
Arctic Cornwallis Island Somerset Island |
genre_facet |
Arctic Cornwallis Island Somerset Island |
op_source |
Canadian Journal of Earth Sciences volume 16, issue 12, page 2204-2218 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e79-208 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
16 |
container_issue |
12 |
container_start_page |
2204 |
op_container_end_page |
2218 |
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1785577218778333184 |