Alaskan Cretaceous-Tertiary floras and Arctic origins
Cretaceous floras in Alaska, when compared to those at mid-latitudes, generally indicate later appearances in Alaska of major clades and major leaf morphologies. Compared to mid-latitude floras, Alaskan Late Cretaceous floras contain few major clades. The Alaskan clades diversified but at a low taxo...
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Language: | English |
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Cambridge University Press (CUP)
1987
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Online Access: | http://dx.doi.org/10.1017/s0094837300008599 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0094837300008599 |
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crcambridgeupr:10.1017/s0094837300008599 2024-04-28T08:07:24+00:00 Alaskan Cretaceous-Tertiary floras and Arctic origins Spicer, Robert A. Wolfe, Jack A. Nichols, Douglas J. 1987 http://dx.doi.org/10.1017/s0094837300008599 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0094837300008599 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Paleobiology volume 13, issue 1, page 73-83 ISSN 0094-8373 1938-5331 Paleontology General Agricultural and Biological Sciences Ecology Ecology, Evolution, Behavior and Systematics journal-article 1987 crcambridgeupr https://doi.org/10.1017/s0094837300008599 2024-04-09T06:55:12Z Cretaceous floras in Alaska, when compared to those at mid-latitudes, generally indicate later appearances in Alaska of major clades and major leaf morphologies. Compared to mid-latitude floras, Alaskan Late Cretaceous floras contain few major clades. The Alaskan clades diversified but at a low taxonomic level. Migrational pathways into high latitudes were probably along streams. Similar patterns characterized the Alaskan Tertiary, although some southward migrations of lineages occurred during the Neogene. Review of other Arctic paleontological data from Ellesmere Island, previously used to suggest that the Arctic was a major center of origin during the Late Cretaceous, indicates that the ages of supposedly substantiating dinoflagellate floras were misinterpreted. When the dinoflagellate data are interpreted according to standard methodology, first occurrences of genera and species groups on Ellesmere are, like the Alaskan occurrences, later than first occurrences at middle latitudes. Article in Journal/Newspaper Arctic Ellesmere Island Alaska Cambridge University Press Paleobiology 13 1 73 83 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Paleontology General Agricultural and Biological Sciences Ecology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Paleontology General Agricultural and Biological Sciences Ecology Ecology, Evolution, Behavior and Systematics Spicer, Robert A. Wolfe, Jack A. Nichols, Douglas J. Alaskan Cretaceous-Tertiary floras and Arctic origins |
topic_facet |
Paleontology General Agricultural and Biological Sciences Ecology Ecology, Evolution, Behavior and Systematics |
description |
Cretaceous floras in Alaska, when compared to those at mid-latitudes, generally indicate later appearances in Alaska of major clades and major leaf morphologies. Compared to mid-latitude floras, Alaskan Late Cretaceous floras contain few major clades. The Alaskan clades diversified but at a low taxonomic level. Migrational pathways into high latitudes were probably along streams. Similar patterns characterized the Alaskan Tertiary, although some southward migrations of lineages occurred during the Neogene. Review of other Arctic paleontological data from Ellesmere Island, previously used to suggest that the Arctic was a major center of origin during the Late Cretaceous, indicates that the ages of supposedly substantiating dinoflagellate floras were misinterpreted. When the dinoflagellate data are interpreted according to standard methodology, first occurrences of genera and species groups on Ellesmere are, like the Alaskan occurrences, later than first occurrences at middle latitudes. |
format |
Article in Journal/Newspaper |
author |
Spicer, Robert A. Wolfe, Jack A. Nichols, Douglas J. |
author_facet |
Spicer, Robert A. Wolfe, Jack A. Nichols, Douglas J. |
author_sort |
Spicer, Robert A. |
title |
Alaskan Cretaceous-Tertiary floras and Arctic origins |
title_short |
Alaskan Cretaceous-Tertiary floras and Arctic origins |
title_full |
Alaskan Cretaceous-Tertiary floras and Arctic origins |
title_fullStr |
Alaskan Cretaceous-Tertiary floras and Arctic origins |
title_full_unstemmed |
Alaskan Cretaceous-Tertiary floras and Arctic origins |
title_sort |
alaskan cretaceous-tertiary floras and arctic origins |
publisher |
Cambridge University Press (CUP) |
publishDate |
1987 |
url |
http://dx.doi.org/10.1017/s0094837300008599 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0094837300008599 |
genre |
Arctic Ellesmere Island Alaska |
genre_facet |
Arctic Ellesmere Island Alaska |
op_source |
Paleobiology volume 13, issue 1, page 73-83 ISSN 0094-8373 1938-5331 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0094837300008599 |
container_title |
Paleobiology |
container_volume |
13 |
container_issue |
1 |
container_start_page |
73 |
op_container_end_page |
83 |
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1797576535855595520 |