Systematic palaeontology and biostratigraphy of two Early Cretaceous condensed sections from the Barents Sea
Bivalve, brachiopod and cirripede faunas from the latest Jurassic and Early Cretaceous Barents Sea boreholes 7320/3-U-l and 7425/9-U-l are systematically described and illustrated. Microfossils have also been studied and the cores arc dated on the basis of the fossil recovery. The bivalve Buchia who...
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Norwegian Polar Institute
1990
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ftjpolarres:oai:journals.openacademia.net:article/2383 2023-05-15T15:38:46+02:00 Systematic palaeontology and biostratigraphy of two Early Cretaceous condensed sections from the Barents Sea Århus, Nils R. A. Kelly, Simon S. H. Collins, Joe R. Sandy, Michael 1990-01-12 application/pdf https://polarresearch.net/index.php/polar/article/view/2383 https://doi.org/10.3402/polar.v8i2.6811 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/2383/5633 https://polarresearch.net/index.php/polar/article/view/2383 doi:10.3402/polar.v8i2.6811 Copyright (c) 2018 Polar Research Polar Research; Vol. 8 No. 2 (1990); 165-194 1751-8369 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1990 ftjpolarres https://doi.org/10.3402/polar.v8i2.6811 2021-11-11T19:12:32Z Bivalve, brachiopod and cirripede faunas from the latest Jurassic and Early Cretaceous Barents Sea boreholes 7320/3-U-l and 7425/9-U-l are systematically described and illustrated. Microfossils have also been studied and the cores arc dated on the basis of the fossil recovery. The bivalve Buchia whose zonal sequence has been used for correlation of boreal marine sections is the most important biostratigraphic marker group in the condensed Boreal Berriasian-Hauterivian intervals of these cores. A new species of cirripede Zeugmatolepas? borealis Collins sp. nov. and dinoflagellate cyst Muderongia aequicornusÅrhus sp. nov. are described. The Late Jurassic fine-grained elastics of core 7320/3-U-l are overlain by about 3 m of grey dolomitic limestone of Valanginian and Hauterivian age. The lowermost part of 7425/9-U-l is represented by a latest Volgian-earliest Berriasian fossiliferous greyish green marl. It is followed by a reddish brown fossilifcrous claystone of Berriasian and perhaps partly Valanginian age. Core 7425/9-U-l also contains a mainly Valanginian greyish green marly limestone which changes into a dark grey to black limestone of Early Barremian age in its upper part. The sedimentological change from condensation to dark grey clay deposition took place in the middle Barremian H. rude-fissicostatum ammonite Zone in 7425/9-U-l and probably slightly earlier in 7320/3-U-l. This was commenced at about the same time as deposition of the inaccurately and only indirectly dated fluvio-deltaic Festningen Sandstone Member on Spitsbergen. The dark claystone may thus be a distal equivalent to this sandstone unit. Article in Journal/Newspaper Barents Sea Polar Research Spitsbergen Polar Research (E-Journal) Barents Sea Polar Research 8 2 165 194 |
institution |
Open Polar |
collection |
Polar Research (E-Journal) |
op_collection_id |
ftjpolarres |
language |
English |
description |
Bivalve, brachiopod and cirripede faunas from the latest Jurassic and Early Cretaceous Barents Sea boreholes 7320/3-U-l and 7425/9-U-l are systematically described and illustrated. Microfossils have also been studied and the cores arc dated on the basis of the fossil recovery. The bivalve Buchia whose zonal sequence has been used for correlation of boreal marine sections is the most important biostratigraphic marker group in the condensed Boreal Berriasian-Hauterivian intervals of these cores. A new species of cirripede Zeugmatolepas? borealis Collins sp. nov. and dinoflagellate cyst Muderongia aequicornusÅrhus sp. nov. are described. The Late Jurassic fine-grained elastics of core 7320/3-U-l are overlain by about 3 m of grey dolomitic limestone of Valanginian and Hauterivian age. The lowermost part of 7425/9-U-l is represented by a latest Volgian-earliest Berriasian fossiliferous greyish green marl. It is followed by a reddish brown fossilifcrous claystone of Berriasian and perhaps partly Valanginian age. Core 7425/9-U-l also contains a mainly Valanginian greyish green marly limestone which changes into a dark grey to black limestone of Early Barremian age in its upper part. The sedimentological change from condensation to dark grey clay deposition took place in the middle Barremian H. rude-fissicostatum ammonite Zone in 7425/9-U-l and probably slightly earlier in 7320/3-U-l. This was commenced at about the same time as deposition of the inaccurately and only indirectly dated fluvio-deltaic Festningen Sandstone Member on Spitsbergen. The dark claystone may thus be a distal equivalent to this sandstone unit. |
format |
Article in Journal/Newspaper |
author |
Århus, Nils R. A. Kelly, Simon S. H. Collins, Joe R. Sandy, Michael |
spellingShingle |
Århus, Nils R. A. Kelly, Simon S. H. Collins, Joe R. Sandy, Michael Systematic palaeontology and biostratigraphy of two Early Cretaceous condensed sections from the Barents Sea |
author_facet |
Århus, Nils R. A. Kelly, Simon S. H. Collins, Joe R. Sandy, Michael |
author_sort |
Århus, Nils |
title |
Systematic palaeontology and biostratigraphy of two Early Cretaceous condensed sections from the Barents Sea |
title_short |
Systematic palaeontology and biostratigraphy of two Early Cretaceous condensed sections from the Barents Sea |
title_full |
Systematic palaeontology and biostratigraphy of two Early Cretaceous condensed sections from the Barents Sea |
title_fullStr |
Systematic palaeontology and biostratigraphy of two Early Cretaceous condensed sections from the Barents Sea |
title_full_unstemmed |
Systematic palaeontology and biostratigraphy of two Early Cretaceous condensed sections from the Barents Sea |
title_sort |
systematic palaeontology and biostratigraphy of two early cretaceous condensed sections from the barents sea |
publisher |
Norwegian Polar Institute |
publishDate |
1990 |
url |
https://polarresearch.net/index.php/polar/article/view/2383 https://doi.org/10.3402/polar.v8i2.6811 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea Polar Research Spitsbergen |
genre_facet |
Barents Sea Polar Research Spitsbergen |
op_source |
Polar Research; Vol. 8 No. 2 (1990); 165-194 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/2383/5633 https://polarresearch.net/index.php/polar/article/view/2383 doi:10.3402/polar.v8i2.6811 |
op_rights |
Copyright (c) 2018 Polar Research |
op_doi |
https://doi.org/10.3402/polar.v8i2.6811 |
container_title |
Polar Research |
container_volume |
8 |
container_issue |
2 |
container_start_page |
165 |
op_container_end_page |
194 |
_version_ |
1766370090136109056 |