A Sand Tiger Shark-Dominated Fauna from the Eocene Arctic Greenhouse
We describe a new shark fauna from Canada's westernmost Arctic island, Banks Island, Northwest Territories, based upon thousands of shark teeth recovered from lower—middle Eocene sediments of the Cyclic Member (Eureka Sound Formation) on northern Banks Island, Northwest Territories (∼74°N latit...
Published in: | Journal of Vertebrate Paleontology |
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ftbioone:10.1080/02724634.2014.880446 2024-06-02T08:01:17+00:00 A Sand Tiger Shark-Dominated Fauna from the Eocene Arctic Greenhouse Aspen Padilla Jaelyn J. Eberle Michael D. Gottfried Arthur R. Sweet J. Howard Hutchison Aspen Padilla Jaelyn J. Eberle Michael D. Gottfried Arthur R. Sweet J. Howard Hutchison world 2014-11-01 text/HTML https://doi.org/10.1080/02724634.2014.880446 en eng The Society of Vertebrate Paleontology doi:10.1080/02724634.2014.880446 All rights reserved. https://doi.org/10.1080/02724634.2014.880446 Text 2014 ftbioone https://doi.org/10.1080/02724634.2014.880446 2024-05-07T00:50:56Z We describe a new shark fauna from Canada's westernmost Arctic island, Banks Island, Northwest Territories, based upon thousands of shark teeth recovered from lower—middle Eocene sediments of the Cyclic Member (Eureka Sound Formation) on northern Banks Island, Northwest Territories (∼74°N latitude). Based upon palynology, the sediments preserving the shark teeth are late early to middle Eocene in age and likely span the Early Eocene Climatic Optimum (EECO). The low-diversity faunal assemblage is dominated by the sand tiger sharks Striatolamia and Carcharias, but also includes relatively rare teeth of the carcharhinid Physogaleus (extinct relative of sharpnose and tiger sharks) and very rare teeth of the odontaspidid Odontaspis winkleri. We also report the occurrence of the ray Myliobatis. Based upon analogy with extant Carcharias taurus and Myliobatis, the presence of Carcharias and Myliobatis on northern Banks Island corroborates the relatively warm sea surface temperatures estimated by others for the Eocene Arctic Ocean. We hypothesize that the low diversity of the Banks Island shark fauna, in comparison with other early Eocene brackish, shallow-marine chondrichthyan assemblages such as the Abbey Wood (U.K.) fauna, is probably due to environmental factors, including reduced salinity. Text Arctic Arctic Ocean Banks Island Eureka Sound Northwest Territories BioOne Online Journals Arctic Arctic Ocean Northwest Territories Eureka ENVELOPE(-85.940,-85.940,79.990,79.990) Arctic Island ENVELOPE(-74.766,-74.766,62.234,62.234) Eureka Sound ENVELOPE(-84.999,-84.999,79.002,79.002) Journal of Vertebrate Paleontology 34 6 1307 1316 |
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BioOne Online Journals |
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ftbioone |
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English |
description |
We describe a new shark fauna from Canada's westernmost Arctic island, Banks Island, Northwest Territories, based upon thousands of shark teeth recovered from lower—middle Eocene sediments of the Cyclic Member (Eureka Sound Formation) on northern Banks Island, Northwest Territories (∼74°N latitude). Based upon palynology, the sediments preserving the shark teeth are late early to middle Eocene in age and likely span the Early Eocene Climatic Optimum (EECO). The low-diversity faunal assemblage is dominated by the sand tiger sharks Striatolamia and Carcharias, but also includes relatively rare teeth of the carcharhinid Physogaleus (extinct relative of sharpnose and tiger sharks) and very rare teeth of the odontaspidid Odontaspis winkleri. We also report the occurrence of the ray Myliobatis. Based upon analogy with extant Carcharias taurus and Myliobatis, the presence of Carcharias and Myliobatis on northern Banks Island corroborates the relatively warm sea surface temperatures estimated by others for the Eocene Arctic Ocean. We hypothesize that the low diversity of the Banks Island shark fauna, in comparison with other early Eocene brackish, shallow-marine chondrichthyan assemblages such as the Abbey Wood (U.K.) fauna, is probably due to environmental factors, including reduced salinity. |
author2 |
Aspen Padilla Jaelyn J. Eberle Michael D. Gottfried Arthur R. Sweet J. Howard Hutchison |
format |
Text |
author |
Aspen Padilla Jaelyn J. Eberle Michael D. Gottfried Arthur R. Sweet J. Howard Hutchison |
spellingShingle |
Aspen Padilla Jaelyn J. Eberle Michael D. Gottfried Arthur R. Sweet J. Howard Hutchison A Sand Tiger Shark-Dominated Fauna from the Eocene Arctic Greenhouse |
author_facet |
Aspen Padilla Jaelyn J. Eberle Michael D. Gottfried Arthur R. Sweet J. Howard Hutchison |
author_sort |
Aspen Padilla |
title |
A Sand Tiger Shark-Dominated Fauna from the Eocene Arctic Greenhouse |
title_short |
A Sand Tiger Shark-Dominated Fauna from the Eocene Arctic Greenhouse |
title_full |
A Sand Tiger Shark-Dominated Fauna from the Eocene Arctic Greenhouse |
title_fullStr |
A Sand Tiger Shark-Dominated Fauna from the Eocene Arctic Greenhouse |
title_full_unstemmed |
A Sand Tiger Shark-Dominated Fauna from the Eocene Arctic Greenhouse |
title_sort |
sand tiger shark-dominated fauna from the eocene arctic greenhouse |
publisher |
The Society of Vertebrate Paleontology |
publishDate |
2014 |
url |
https://doi.org/10.1080/02724634.2014.880446 |
op_coverage |
world |
long_lat |
ENVELOPE(-85.940,-85.940,79.990,79.990) ENVELOPE(-74.766,-74.766,62.234,62.234) ENVELOPE(-84.999,-84.999,79.002,79.002) |
geographic |
Arctic Arctic Ocean Northwest Territories Eureka Arctic Island Eureka Sound |
geographic_facet |
Arctic Arctic Ocean Northwest Territories Eureka Arctic Island Eureka Sound |
genre |
Arctic Arctic Ocean Banks Island Eureka Sound Northwest Territories |
genre_facet |
Arctic Arctic Ocean Banks Island Eureka Sound Northwest Territories |
op_source |
https://doi.org/10.1080/02724634.2014.880446 |
op_relation |
doi:10.1080/02724634.2014.880446 |
op_rights |
All rights reserved. |
op_doi |
https://doi.org/10.1080/02724634.2014.880446 |
container_title |
Journal of Vertebrate Paleontology |
container_volume |
34 |
container_issue |
6 |
container_start_page |
1307 |
op_container_end_page |
1316 |
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1800745590162718720 |