New Kimmeridgian ammonite fauna from east Spitsbergen and its phyletic significance
A rich Kimmeridgian ammonite fauna is described from the Janusfjellet Subgroup at Holmgardfjellet, Agardhbukta, east Spitsbergen. The fauna collected from a narrow stratigraphic interval represents a single ammonite assemblage showing a wide but continuous range of variability, with end-forms strong...
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Norwegian Polar Institute
1991
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ftjpolarres:oai:journals.openacademia.net:article/2360 2023-05-15T18:02:40+02:00 New Kimmeridgian ammonite fauna from east Spitsbergen and its phyletic significance Birkenmajer, Krzysztof Wierzbowski, Andrzej 1991-01-06 application/pdf https://polarresearch.net/index.php/polar/article/view/2360 https://doi.org/10.3402/polar.v9i2.6789 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/2360/5610 https://polarresearch.net/index.php/polar/article/view/2360 doi:10.3402/polar.v9i2.6789 Copyright (c) 2018 Polar Research Polar Research; Vol. 9 No. 2 (1991); 169-179 1751-8369 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1991 ftjpolarres https://doi.org/10.3402/polar.v9i2.6789 2021-11-11T19:12:32Z A rich Kimmeridgian ammonite fauna is described from the Janusfjellet Subgroup at Holmgardfjellet, Agardhbukta, east Spitsbergen. The fauna collected from a narrow stratigraphic interval represents a single ammonite assemblage showing a wide but continuous range of variability, with end-forms strongly resembling Amoeboceras (Hoplocardioceras) decipiens Spath and A. (Amoebites) elegans Spath, respectively. Accepting a horizontal classification in ammonite taxonomy, the assemblage may easily be placed into a single species for which the name Amoeboceras (Amoebites) uralense Mesezhnikov, 1973, is available, as this form corresponds to the intermediate and the most common morphotype. The fauna with A. uralense is possibly directly below that with A. elegans and A. decipiens, but above that with A. kochi. Close phyletic relations are suggested between the A. elegans - A. uralense group (traditionally placed in the subgenus Amoebites) and the subgenera Hoplocardioceras (type species A. decipiens), and Euprionoceras (type species A. kochi). Article in Journal/Newspaper Polar Research Spitsbergen Polar Research (E-Journal) Janusfjellet ENVELOPE(15.833,15.833,78.333,78.333) Agardhbukta ENVELOPE(18.519,18.519,78.021,78.021) Holmgardfjellet ENVELOPE(18.500,18.500,78.100,78.100) Polar Research 9 2 169 179 |
institution |
Open Polar |
collection |
Polar Research (E-Journal) |
op_collection_id |
ftjpolarres |
language |
English |
description |
A rich Kimmeridgian ammonite fauna is described from the Janusfjellet Subgroup at Holmgardfjellet, Agardhbukta, east Spitsbergen. The fauna collected from a narrow stratigraphic interval represents a single ammonite assemblage showing a wide but continuous range of variability, with end-forms strongly resembling Amoeboceras (Hoplocardioceras) decipiens Spath and A. (Amoebites) elegans Spath, respectively. Accepting a horizontal classification in ammonite taxonomy, the assemblage may easily be placed into a single species for which the name Amoeboceras (Amoebites) uralense Mesezhnikov, 1973, is available, as this form corresponds to the intermediate and the most common morphotype. The fauna with A. uralense is possibly directly below that with A. elegans and A. decipiens, but above that with A. kochi. Close phyletic relations are suggested between the A. elegans - A. uralense group (traditionally placed in the subgenus Amoebites) and the subgenera Hoplocardioceras (type species A. decipiens), and Euprionoceras (type species A. kochi). |
format |
Article in Journal/Newspaper |
author |
Birkenmajer, Krzysztof Wierzbowski, Andrzej |
spellingShingle |
Birkenmajer, Krzysztof Wierzbowski, Andrzej New Kimmeridgian ammonite fauna from east Spitsbergen and its phyletic significance |
author_facet |
Birkenmajer, Krzysztof Wierzbowski, Andrzej |
author_sort |
Birkenmajer, Krzysztof |
title |
New Kimmeridgian ammonite fauna from east Spitsbergen and its phyletic significance |
title_short |
New Kimmeridgian ammonite fauna from east Spitsbergen and its phyletic significance |
title_full |
New Kimmeridgian ammonite fauna from east Spitsbergen and its phyletic significance |
title_fullStr |
New Kimmeridgian ammonite fauna from east Spitsbergen and its phyletic significance |
title_full_unstemmed |
New Kimmeridgian ammonite fauna from east Spitsbergen and its phyletic significance |
title_sort |
new kimmeridgian ammonite fauna from east spitsbergen and its phyletic significance |
publisher |
Norwegian Polar Institute |
publishDate |
1991 |
url |
https://polarresearch.net/index.php/polar/article/view/2360 https://doi.org/10.3402/polar.v9i2.6789 |
long_lat |
ENVELOPE(15.833,15.833,78.333,78.333) ENVELOPE(18.519,18.519,78.021,78.021) ENVELOPE(18.500,18.500,78.100,78.100) |
geographic |
Janusfjellet Agardhbukta Holmgardfjellet |
geographic_facet |
Janusfjellet Agardhbukta Holmgardfjellet |
genre |
Polar Research Spitsbergen |
genre_facet |
Polar Research Spitsbergen |
op_source |
Polar Research; Vol. 9 No. 2 (1991); 169-179 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/2360/5610 https://polarresearch.net/index.php/polar/article/view/2360 doi:10.3402/polar.v9i2.6789 |
op_rights |
Copyright (c) 2018 Polar Research |
op_doi |
https://doi.org/10.3402/polar.v9i2.6789 |
container_title |
Polar Research |
container_volume |
9 |
container_issue |
2 |
container_start_page |
169 |
op_container_end_page |
179 |
_version_ |
1766173101141262336 |