Upper Homerian (upper Wenlock, Silurian) graptolites from arctic Canada
An extraordinarily well-preserved upper Homerian (uppermost Wenlock) post-extinction (post- lundgreni Event) graptolite fauna is described from Arctic Canada. The fauna of dendroids, retiolitids and monograptids, predominantly of uncompressed and isolated material, demonstrates almost totally new mo...
Published in: | Journal of Paleontology |
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Language: | English |
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Cambridge University Press (CUP)
2002
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Online Access: | http://dx.doi.org/10.1017/s0022336000041731 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022336000041731 |
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crcambridgeupr:10.1017/s0022336000041731 2024-09-09T19:21:08+00:00 Upper Homerian (upper Wenlock, Silurian) graptolites from arctic Canada Lenz, A. C. Kozłowska-Dawidziuk, A. 2002 http://dx.doi.org/10.1017/s0022336000041731 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022336000041731 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Journal of Paleontology volume 76, issue 2, page 321-346 ISSN 0022-3360 1937-2337 journal-article 2002 crcambridgeupr https://doi.org/10.1017/s0022336000041731 2024-07-31T04:03:51Z An extraordinarily well-preserved upper Homerian (uppermost Wenlock) post-extinction (post- lundgreni Event) graptolite fauna is described from Arctic Canada. The fauna of dendroids, retiolitids and monograptids, predominantly of uncompressed and isolated material, demonstrates almost totally new morphological features in comparison with the pre-extinction fauna. The two species of the lowest post-extinction fauna are followed by a rapid proliferation in the middle part of the interval, resulting in the maximum diversity, 21 species, for the entire upper Homerian. The upper Homerian is divided into three biostratigraphic units: the lower nassadubius Biozone, middle praedeubeli-deubeli Biozone, and the upper ludensis Biozone. The total fauna consists of ten species of monograptids and 11 species of retiolitids; of the latter group, three ( Baculograptus, Papiliograptus and Doliograptus ) are new genera, and six ( B. batesi, P. papilio, P. ? petilus, D. latus, Doliograptus sp. A, and Spinograptus praerobustus ) are new species. Among the recognized species of monograptids, only Colonograptus schedidoneus and Lobograptus ? cornuatus are confined to the Arctic, while five species of retiolitids ( B. batesi, P. ? petilus, D. latus, Doliograptus sp. A, and Spinograptus praerobustus ) appear to be endemic. Article in Journal/Newspaper Arctic Cambridge University Press Arctic Canada Journal of Paleontology 76 2 321 346 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
An extraordinarily well-preserved upper Homerian (uppermost Wenlock) post-extinction (post- lundgreni Event) graptolite fauna is described from Arctic Canada. The fauna of dendroids, retiolitids and monograptids, predominantly of uncompressed and isolated material, demonstrates almost totally new morphological features in comparison with the pre-extinction fauna. The two species of the lowest post-extinction fauna are followed by a rapid proliferation in the middle part of the interval, resulting in the maximum diversity, 21 species, for the entire upper Homerian. The upper Homerian is divided into three biostratigraphic units: the lower nassadubius Biozone, middle praedeubeli-deubeli Biozone, and the upper ludensis Biozone. The total fauna consists of ten species of monograptids and 11 species of retiolitids; of the latter group, three ( Baculograptus, Papiliograptus and Doliograptus ) are new genera, and six ( B. batesi, P. papilio, P. ? petilus, D. latus, Doliograptus sp. A, and Spinograptus praerobustus ) are new species. Among the recognized species of monograptids, only Colonograptus schedidoneus and Lobograptus ? cornuatus are confined to the Arctic, while five species of retiolitids ( B. batesi, P. ? petilus, D. latus, Doliograptus sp. A, and Spinograptus praerobustus ) appear to be endemic. |
format |
Article in Journal/Newspaper |
author |
Lenz, A. C. Kozłowska-Dawidziuk, A. |
spellingShingle |
Lenz, A. C. Kozłowska-Dawidziuk, A. Upper Homerian (upper Wenlock, Silurian) graptolites from arctic Canada |
author_facet |
Lenz, A. C. Kozłowska-Dawidziuk, A. |
author_sort |
Lenz, A. C. |
title |
Upper Homerian (upper Wenlock, Silurian) graptolites from arctic Canada |
title_short |
Upper Homerian (upper Wenlock, Silurian) graptolites from arctic Canada |
title_full |
Upper Homerian (upper Wenlock, Silurian) graptolites from arctic Canada |
title_fullStr |
Upper Homerian (upper Wenlock, Silurian) graptolites from arctic Canada |
title_full_unstemmed |
Upper Homerian (upper Wenlock, Silurian) graptolites from arctic Canada |
title_sort |
upper homerian (upper wenlock, silurian) graptolites from arctic canada |
publisher |
Cambridge University Press (CUP) |
publishDate |
2002 |
url |
http://dx.doi.org/10.1017/s0022336000041731 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022336000041731 |
geographic |
Arctic Canada |
geographic_facet |
Arctic Canada |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Journal of Paleontology volume 76, issue 2, page 321-346 ISSN 0022-3360 1937-2337 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0022336000041731 |
container_title |
Journal of Paleontology |
container_volume |
76 |
container_issue |
2 |
container_start_page |
321 |
op_container_end_page |
346 |
_version_ |
1809761334064054272 |