Lower Jurassic Amaltheidae (Ammonitina) in North America: paleobiogeography and tectonic implications
The amaltheids are restricted temporally to the late Pliensbachian and geographically to the northern part of the northern hemisphere. Amaltheus stokesi is the only species that occurs in all areas of North America where amaltheids are found. The craton north of the CanadaU.S.A. border yields the m...
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crcansciencepubl:10.1139/e01-034 2024-09-15T18:23:39+00:00 Lower Jurassic Amaltheidae (Ammonitina) in North America: paleobiogeography and tectonic implications Smith, Paul L Tipper, Howard W Ham, David M 2001 http://dx.doi.org/10.1139/e01-034 http://www.nrcresearchpress.com/doi/pdf/10.1139/e01-034 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 38, issue 10, page 1439-1449 ISSN 0008-4077 1480-3313 journal-article 2001 crcansciencepubl https://doi.org/10.1139/e01-034 2024-07-25T04:10:06Z The amaltheids are restricted temporally to the late Pliensbachian and geographically to the northern part of the northern hemisphere. Amaltheus stokesi is the only species that occurs in all areas of North America where amaltheids are found. The craton north of the CanadaU.S.A. border yields the most diverse amaltheid fauna, including six of the seven taxa known in North America. On Quesnellia and Stikinia, there are no endemic amaltheids, and diversity is low; A. stokesi increases in abundance northwards where, in Stikinia, A. margaritatus makes rare appearances. Wrangellia, with its rich Pliensbachian Tethyan and east Pacific faunas, is almost devoid of amaltheids, but its amaltheid fauna does include two specimens of A. viligaensis, an eastern Russian species that is unknown elsewhere in North America. Cratonal amaltheid faunas have more in common with those of northwest Europe than eastern Eurasia, suggesting that the Arctic and northern North Atlantic constituted the main dispersal route. Paleobiogeographic patterns on the major allochthonous terranes argue against terrane rotation and in support of post-Pliensbachian northward displacement relative to the North American craton. In addition, the presence of western Pacific faunal elements on Wrangellia suggests a more significant longitudinal displacement relative to the craton for this terrane compared to that for Quesnellia and Stikinia. The Chilliwack terrane of southwestern British Columbia is a Pliensbachian paleobiogeographic anomaly. Article in Journal/Newspaper North Atlantic Canadian Science Publishing Canadian Journal of Earth Sciences 38 10 1439 1449 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
The amaltheids are restricted temporally to the late Pliensbachian and geographically to the northern part of the northern hemisphere. Amaltheus stokesi is the only species that occurs in all areas of North America where amaltheids are found. The craton north of the CanadaU.S.A. border yields the most diverse amaltheid fauna, including six of the seven taxa known in North America. On Quesnellia and Stikinia, there are no endemic amaltheids, and diversity is low; A. stokesi increases in abundance northwards where, in Stikinia, A. margaritatus makes rare appearances. Wrangellia, with its rich Pliensbachian Tethyan and east Pacific faunas, is almost devoid of amaltheids, but its amaltheid fauna does include two specimens of A. viligaensis, an eastern Russian species that is unknown elsewhere in North America. Cratonal amaltheid faunas have more in common with those of northwest Europe than eastern Eurasia, suggesting that the Arctic and northern North Atlantic constituted the main dispersal route. Paleobiogeographic patterns on the major allochthonous terranes argue against terrane rotation and in support of post-Pliensbachian northward displacement relative to the North American craton. In addition, the presence of western Pacific faunal elements on Wrangellia suggests a more significant longitudinal displacement relative to the craton for this terrane compared to that for Quesnellia and Stikinia. The Chilliwack terrane of southwestern British Columbia is a Pliensbachian paleobiogeographic anomaly. |
format |
Article in Journal/Newspaper |
author |
Smith, Paul L Tipper, Howard W Ham, David M |
spellingShingle |
Smith, Paul L Tipper, Howard W Ham, David M Lower Jurassic Amaltheidae (Ammonitina) in North America: paleobiogeography and tectonic implications |
author_facet |
Smith, Paul L Tipper, Howard W Ham, David M |
author_sort |
Smith, Paul L |
title |
Lower Jurassic Amaltheidae (Ammonitina) in North America: paleobiogeography and tectonic implications |
title_short |
Lower Jurassic Amaltheidae (Ammonitina) in North America: paleobiogeography and tectonic implications |
title_full |
Lower Jurassic Amaltheidae (Ammonitina) in North America: paleobiogeography and tectonic implications |
title_fullStr |
Lower Jurassic Amaltheidae (Ammonitina) in North America: paleobiogeography and tectonic implications |
title_full_unstemmed |
Lower Jurassic Amaltheidae (Ammonitina) in North America: paleobiogeography and tectonic implications |
title_sort |
lower jurassic amaltheidae (ammonitina) in north america: paleobiogeography and tectonic implications |
publisher |
Canadian Science Publishing |
publishDate |
2001 |
url |
http://dx.doi.org/10.1139/e01-034 http://www.nrcresearchpress.com/doi/pdf/10.1139/e01-034 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Canadian Journal of Earth Sciences volume 38, issue 10, page 1439-1449 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e01-034 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
38 |
container_issue |
10 |
container_start_page |
1439 |
op_container_end_page |
1449 |
_version_ |
1810463893413167104 |