Late Cretaceous radiolarians from a bentonite-rich interval at the base of the Niobrara Formation, southwestern Saskatchewan, Canada: biostratigraphic and paleoenvironmental implications
A radiolarian assemblage containing 11 species of both nasellarians and spumellarians was recovered from the Upper Cretaceous Niobrara Formation in southwestern Saskatchewan, Canada. This assemblage represents the first report of Coniacian radiolarians in the entire Western Interior Basin and one of...
Published in: | Canadian Journal of Earth Sciences |
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Language: | English |
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2018
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crcansciencepubl:10.1139/cjes-2017-0115 2023-12-17T10:25:54+01:00 Late Cretaceous radiolarians from a bentonite-rich interval at the base of the Niobrara Formation, southwestern Saskatchewan, Canada: biostratigraphic and paleoenvironmental implications Diaz, Juan F. Velez, Maria I. 2018 http://dx.doi.org/10.1139/cjes-2017-0115 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjes-2017-0115 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjes-2017-0115 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 55, issue 3, page 321-329 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 2018 crcansciencepubl https://doi.org/10.1139/cjes-2017-0115 2023-11-19T13:39:37Z A radiolarian assemblage containing 11 species of both nasellarians and spumellarians was recovered from the Upper Cretaceous Niobrara Formation in southwestern Saskatchewan, Canada. This assemblage represents the first report of Coniacian radiolarians in the entire Western Interior Basin and one of the few reports for the Upper Cretaceous in North America. The presence of radiolarians and the partial disappearance of foraminifera in the only bentonitic interval in this formation suggest that high silica concentrations supplied by volcanic events favored ecological conditions for radiolarians to thrive and or enhanced their preservation before and after deposition. Correlation of this assemblage with other Upper Cretaceous radiolarian assemblages in North America shows a close affinity with the microfauna recovered in the Sverdrup Basin (Canadian Arctic). Article in Journal/Newspaper Arctic Foraminifera* sverdrup basin Canadian Science Publishing (via Crossref) Arctic Canada Canadian Journal of Earth Sciences 55 3 321 329 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Diaz, Juan F. Velez, Maria I. Late Cretaceous radiolarians from a bentonite-rich interval at the base of the Niobrara Formation, southwestern Saskatchewan, Canada: biostratigraphic and paleoenvironmental implications |
topic_facet |
General Earth and Planetary Sciences |
description |
A radiolarian assemblage containing 11 species of both nasellarians and spumellarians was recovered from the Upper Cretaceous Niobrara Formation in southwestern Saskatchewan, Canada. This assemblage represents the first report of Coniacian radiolarians in the entire Western Interior Basin and one of the few reports for the Upper Cretaceous in North America. The presence of radiolarians and the partial disappearance of foraminifera in the only bentonitic interval in this formation suggest that high silica concentrations supplied by volcanic events favored ecological conditions for radiolarians to thrive and or enhanced their preservation before and after deposition. Correlation of this assemblage with other Upper Cretaceous radiolarian assemblages in North America shows a close affinity with the microfauna recovered in the Sverdrup Basin (Canadian Arctic). |
format |
Article in Journal/Newspaper |
author |
Diaz, Juan F. Velez, Maria I. |
author_facet |
Diaz, Juan F. Velez, Maria I. |
author_sort |
Diaz, Juan F. |
title |
Late Cretaceous radiolarians from a bentonite-rich interval at the base of the Niobrara Formation, southwestern Saskatchewan, Canada: biostratigraphic and paleoenvironmental implications |
title_short |
Late Cretaceous radiolarians from a bentonite-rich interval at the base of the Niobrara Formation, southwestern Saskatchewan, Canada: biostratigraphic and paleoenvironmental implications |
title_full |
Late Cretaceous radiolarians from a bentonite-rich interval at the base of the Niobrara Formation, southwestern Saskatchewan, Canada: biostratigraphic and paleoenvironmental implications |
title_fullStr |
Late Cretaceous radiolarians from a bentonite-rich interval at the base of the Niobrara Formation, southwestern Saskatchewan, Canada: biostratigraphic and paleoenvironmental implications |
title_full_unstemmed |
Late Cretaceous radiolarians from a bentonite-rich interval at the base of the Niobrara Formation, southwestern Saskatchewan, Canada: biostratigraphic and paleoenvironmental implications |
title_sort |
late cretaceous radiolarians from a bentonite-rich interval at the base of the niobrara formation, southwestern saskatchewan, canada: biostratigraphic and paleoenvironmental implications |
publisher |
Canadian Science Publishing |
publishDate |
2018 |
url |
http://dx.doi.org/10.1139/cjes-2017-0115 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjes-2017-0115 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjes-2017-0115 |
geographic |
Arctic Canada |
geographic_facet |
Arctic Canada |
genre |
Arctic Foraminifera* sverdrup basin |
genre_facet |
Arctic Foraminifera* sverdrup basin |
op_source |
Canadian Journal of Earth Sciences volume 55, issue 3, page 321-329 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjes-2017-0115 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
55 |
container_issue |
3 |
container_start_page |
321 |
op_container_end_page |
329 |
_version_ |
1785577577510862848 |