The paleoecological significance of new species of Limbicysta (Acritarcha) from the upper Albian of the Canadian Arctic Islands
Limbicysta octopediformis and Limbicysta quadriformis are new acritarch species from the upper Albian Bastion Ridge and Strand Fiord formations of the Sverdrup Basin, Canadian Arctic Islands. They are similar to the type species, Limbicysta pediformis Marshall, but have eight asymmetric or four symm...
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Canadian Science Publishing
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crcansciencepubl:10.1139/e96-111 2024-09-30T14:30:17+00:00 The paleoecological significance of new species of Limbicysta (Acritarcha) from the upper Albian of the Canadian Arctic Islands MacRae, R. Andrew Hills, L. V. McIntyre, D. J. 1996 http://dx.doi.org/10.1139/e96-111 http://www.nrcresearchpress.com/doi/pdf/10.1139/e96-111 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 33, issue 11, page 1475-1486 ISSN 0008-4077 1480-3313 journal-article 1996 crcansciencepubl https://doi.org/10.1139/e96-111 2024-09-05T04:11:16Z Limbicysta octopediformis and Limbicysta quadriformis are new acritarch species from the upper Albian Bastion Ridge and Strand Fiord formations of the Sverdrup Basin, Canadian Arctic Islands. They are similar to the type species, Limbicysta pediformis Marshall, but have eight asymmetric or four symmetric process tips versus the four asymmetric and one symmetric process tips of L. pediformis. They are distinguished from other species of Limbicysta by their single wall layer, lack of longitudinal folds, and degree of compression. Like other species of Limbicysta, both new species are found associated with indicators of brackish-water paleoenvironments—in this example, assemblages dominated by terrestrial palynomorphs and with a low diversity of dinoflagellate cysts dominated by Nyktericysta spp. and acritarchs. The presence of Limbicysta in large numbers indicates stressed nearshore marine environments, probably brackish water. This study extends the age range of Limbicysta considerably (late Pliensbachian to early Santonian), and the geographic occurrence from the Southern Hemisphere into the Northern Hemisphere. The affinities of the genus are uncertain. Article in Journal/Newspaper Arctic sverdrup basin Canadian Science Publishing Arctic Strand Fiord ENVELOPE(-91.468,-91.468,79.185,79.185) Bastion Ridge ENVELOPE(-90.801,-90.801,79.352,79.352) Canadian Journal of Earth Sciences 33 11 1475 1486 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Limbicysta octopediformis and Limbicysta quadriformis are new acritarch species from the upper Albian Bastion Ridge and Strand Fiord formations of the Sverdrup Basin, Canadian Arctic Islands. They are similar to the type species, Limbicysta pediformis Marshall, but have eight asymmetric or four symmetric process tips versus the four asymmetric and one symmetric process tips of L. pediformis. They are distinguished from other species of Limbicysta by their single wall layer, lack of longitudinal folds, and degree of compression. Like other species of Limbicysta, both new species are found associated with indicators of brackish-water paleoenvironments—in this example, assemblages dominated by terrestrial palynomorphs and with a low diversity of dinoflagellate cysts dominated by Nyktericysta spp. and acritarchs. The presence of Limbicysta in large numbers indicates stressed nearshore marine environments, probably brackish water. This study extends the age range of Limbicysta considerably (late Pliensbachian to early Santonian), and the geographic occurrence from the Southern Hemisphere into the Northern Hemisphere. The affinities of the genus are uncertain. |
format |
Article in Journal/Newspaper |
author |
MacRae, R. Andrew Hills, L. V. McIntyre, D. J. |
spellingShingle |
MacRae, R. Andrew Hills, L. V. McIntyre, D. J. The paleoecological significance of new species of Limbicysta (Acritarcha) from the upper Albian of the Canadian Arctic Islands |
author_facet |
MacRae, R. Andrew Hills, L. V. McIntyre, D. J. |
author_sort |
MacRae, R. Andrew |
title |
The paleoecological significance of new species of Limbicysta (Acritarcha) from the upper Albian of the Canadian Arctic Islands |
title_short |
The paleoecological significance of new species of Limbicysta (Acritarcha) from the upper Albian of the Canadian Arctic Islands |
title_full |
The paleoecological significance of new species of Limbicysta (Acritarcha) from the upper Albian of the Canadian Arctic Islands |
title_fullStr |
The paleoecological significance of new species of Limbicysta (Acritarcha) from the upper Albian of the Canadian Arctic Islands |
title_full_unstemmed |
The paleoecological significance of new species of Limbicysta (Acritarcha) from the upper Albian of the Canadian Arctic Islands |
title_sort |
paleoecological significance of new species of limbicysta (acritarcha) from the upper albian of the canadian arctic islands |
publisher |
Canadian Science Publishing |
publishDate |
1996 |
url |
http://dx.doi.org/10.1139/e96-111 http://www.nrcresearchpress.com/doi/pdf/10.1139/e96-111 |
long_lat |
ENVELOPE(-91.468,-91.468,79.185,79.185) ENVELOPE(-90.801,-90.801,79.352,79.352) |
geographic |
Arctic Strand Fiord Bastion Ridge |
geographic_facet |
Arctic Strand Fiord Bastion Ridge |
genre |
Arctic sverdrup basin |
genre_facet |
Arctic sverdrup basin |
op_source |
Canadian Journal of Earth Sciences volume 33, issue 11, page 1475-1486 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e96-111 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
33 |
container_issue |
11 |
container_start_page |
1475 |
op_container_end_page |
1486 |
_version_ |
1811635303215005696 |