Late Pleistocene Palaeoenvironments of the Southern Lake Agassiz Basin, USA
Abstract Macroscopic plant remains, pollen, insect and mollusc fossils recovered from a cut bank on the Red River in North Dakota, USA, provide evidence that an extensive wetland occupied the southern basin of Lake Agassiz from 10 230 to 9900 14 C yr BP. Marsh‐dwelling plants and invertebrates had c...
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crwiley:10.1002/jqs.905 2024-06-02T08:02:23+00:00 Late Pleistocene Palaeoenvironments of the Southern Lake Agassiz Basin, USA Yansa, Catherine H. Ashworth, Allan C. 2005 http://dx.doi.org/10.1002/jqs.905 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.905 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.905 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 20, issue 3, page 255-267 ISSN 0267-8179 1099-1417 journal-article 2005 crwiley https://doi.org/10.1002/jqs.905 2024-05-03T10:43:31Z Abstract Macroscopic plant remains, pollen, insect and mollusc fossils recovered from a cut bank on the Red River in North Dakota, USA, provide evidence that an extensive wetland occupied the southern basin of Lake Agassiz from 10 230 to 9900 14 C yr BP. Marsh‐dwelling plants and invertebrates had colonised the surface of a prograding delta during the low‐water Moorhead Phase of Lake Agassiz. A species of Salix (willow) was abundant along distributary channels, and stands of Populus tremuloides (aspen), Ulmus sp. (elm), Betula sp. (birch), and Picea sp. (spruce) grew on the better‐drained sand bars and beach ridges. Most of the species of plants, insects, and molluscs represented as fossils are within their existing geographic ranges. Based on a few species with more northerly distributions, mean summer temperature may have been about 1–2°C lower than the present day. No change in species composition occurred in the transition from the Younger Dryas to Preboreal. At the time that the wetland existed, Lake Agassiz was draining either eastward to the North Atlantic Ocean or northwestward to the Arctic Ocean. The wetland was drowned during the Emerson Phase transgression that resulted in meltwater draining southward to the Gulf of Mexico after 9900 14 C yr BP. Copyright © 2005 John Wiley & Sons, Ltd. Article in Journal/Newspaper Arctic Arctic Ocean North Atlantic Wiley Online Library Arctic Arctic Ocean Cut Bank ENVELOPE(-115.902,-115.902,55.517,55.517) Emerson ENVELOPE(168.733,168.733,-71.583,-71.583) Southern Lake ENVELOPE(-94.333,-94.333,62.217,62.217) Journal of Quaternary Science 20 3 255 267 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Macroscopic plant remains, pollen, insect and mollusc fossils recovered from a cut bank on the Red River in North Dakota, USA, provide evidence that an extensive wetland occupied the southern basin of Lake Agassiz from 10 230 to 9900 14 C yr BP. Marsh‐dwelling plants and invertebrates had colonised the surface of a prograding delta during the low‐water Moorhead Phase of Lake Agassiz. A species of Salix (willow) was abundant along distributary channels, and stands of Populus tremuloides (aspen), Ulmus sp. (elm), Betula sp. (birch), and Picea sp. (spruce) grew on the better‐drained sand bars and beach ridges. Most of the species of plants, insects, and molluscs represented as fossils are within their existing geographic ranges. Based on a few species with more northerly distributions, mean summer temperature may have been about 1–2°C lower than the present day. No change in species composition occurred in the transition from the Younger Dryas to Preboreal. At the time that the wetland existed, Lake Agassiz was draining either eastward to the North Atlantic Ocean or northwestward to the Arctic Ocean. The wetland was drowned during the Emerson Phase transgression that resulted in meltwater draining southward to the Gulf of Mexico after 9900 14 C yr BP. Copyright © 2005 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Yansa, Catherine H. Ashworth, Allan C. |
spellingShingle |
Yansa, Catherine H. Ashworth, Allan C. Late Pleistocene Palaeoenvironments of the Southern Lake Agassiz Basin, USA |
author_facet |
Yansa, Catherine H. Ashworth, Allan C. |
author_sort |
Yansa, Catherine H. |
title |
Late Pleistocene Palaeoenvironments of the Southern Lake Agassiz Basin, USA |
title_short |
Late Pleistocene Palaeoenvironments of the Southern Lake Agassiz Basin, USA |
title_full |
Late Pleistocene Palaeoenvironments of the Southern Lake Agassiz Basin, USA |
title_fullStr |
Late Pleistocene Palaeoenvironments of the Southern Lake Agassiz Basin, USA |
title_full_unstemmed |
Late Pleistocene Palaeoenvironments of the Southern Lake Agassiz Basin, USA |
title_sort |
late pleistocene palaeoenvironments of the southern lake agassiz basin, usa |
publisher |
Wiley |
publishDate |
2005 |
url |
http://dx.doi.org/10.1002/jqs.905 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.905 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.905 |
long_lat |
ENVELOPE(-115.902,-115.902,55.517,55.517) ENVELOPE(168.733,168.733,-71.583,-71.583) ENVELOPE(-94.333,-94.333,62.217,62.217) |
geographic |
Arctic Arctic Ocean Cut Bank Emerson Southern Lake |
geographic_facet |
Arctic Arctic Ocean Cut Bank Emerson Southern Lake |
genre |
Arctic Arctic Ocean North Atlantic |
genre_facet |
Arctic Arctic Ocean North Atlantic |
op_source |
Journal of Quaternary Science volume 20, issue 3, page 255-267 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.905 |
container_title |
Journal of Quaternary Science |
container_volume |
20 |
container_issue |
3 |
container_start_page |
255 |
op_container_end_page |
267 |
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1800746880627376128 |