Plant and Insect Fossils at Norwood in South-Central Minnesota: A Record of Late-Glacial Succession
Abstract The Norwood site in Sibley Co., Minnesota, contains 1.6 m of silt resting on till and overlain by peat. The base of the peat has been radiocarbon dated at 12,400 ± 60 and the top at 11,200 ± 250 yr B.P. The pollen, plant macrofossils, and insect remains in the basal silt consist of boreal s...
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Cambridge University Press (CUP)
1981
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crcambridgeupr:10.1016/0033-5894(81)90128-9 2024-06-09T07:50:01+00:00 Plant and Insect Fossils at Norwood in South-Central Minnesota: A Record of Late-Glacial Succession Ashworth, Allan C. Schwert, Donald P. Watts, William A. Wright, H.E. 1981 http://dx.doi.org/10.1016/0033-5894(81)90128-9 http://api.elsevier.com/content/article/PII:0033589481901289?httpAccept=text/xml http://api.elsevier.com/content/article/PII:0033589481901289?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400021645 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 16, issue 1, page 66-79 ISSN 0033-5894 1096-0287 journal-article 1981 crcambridgeupr https://doi.org/10.1016/0033-5894(81)90128-9 2024-05-15T13:15:59Z Abstract The Norwood site in Sibley Co., Minnesota, contains 1.6 m of silt resting on till and overlain by peat. The base of the peat has been radiocarbon dated at 12,400 ± 60 and the top at 11,200 ± 250 yr B.P. The pollen, plant macrofossils, and insect remains in the basal silt consist of boreal species inhabiting open environments, but not tundra. No modern analogue exists for the insect assemblage, which includes elements of boreal forest, tundra-forest, and western affinities. The transition from an unstable open environment to a stable coniferous forest is reflected by both plant and insect fossils and is interpreted as a successional rather than a climatic event. During this time of significant biologic change, the climate is inferred to have been relatively uniform, with temperatures similar to those presently existing in the boreal forest south of the tundra-forest transition zone. The geologic and ecologic succession at Norwood is generally similar to that presently associated with ice stagnation of the Klutlan Glacier in the Yukon Territory. Localized successional sequences similar to those at Norwood are conceived to have occurred repeatedly during the melting of the Laurentide ice, and thus the proposed model has potentially broad application to the interpretation of late-glacial sequences. Article in Journal/Newspaper Tundra Yukon Cambridge University Press Klutlan Glacier ENVELOPE(-140.604,-140.604,61.499,61.499) Yukon Quaternary Research 16 1 66 79 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract The Norwood site in Sibley Co., Minnesota, contains 1.6 m of silt resting on till and overlain by peat. The base of the peat has been radiocarbon dated at 12,400 ± 60 and the top at 11,200 ± 250 yr B.P. The pollen, plant macrofossils, and insect remains in the basal silt consist of boreal species inhabiting open environments, but not tundra. No modern analogue exists for the insect assemblage, which includes elements of boreal forest, tundra-forest, and western affinities. The transition from an unstable open environment to a stable coniferous forest is reflected by both plant and insect fossils and is interpreted as a successional rather than a climatic event. During this time of significant biologic change, the climate is inferred to have been relatively uniform, with temperatures similar to those presently existing in the boreal forest south of the tundra-forest transition zone. The geologic and ecologic succession at Norwood is generally similar to that presently associated with ice stagnation of the Klutlan Glacier in the Yukon Territory. Localized successional sequences similar to those at Norwood are conceived to have occurred repeatedly during the melting of the Laurentide ice, and thus the proposed model has potentially broad application to the interpretation of late-glacial sequences. |
format |
Article in Journal/Newspaper |
author |
Ashworth, Allan C. Schwert, Donald P. Watts, William A. Wright, H.E. |
spellingShingle |
Ashworth, Allan C. Schwert, Donald P. Watts, William A. Wright, H.E. Plant and Insect Fossils at Norwood in South-Central Minnesota: A Record of Late-Glacial Succession |
author_facet |
Ashworth, Allan C. Schwert, Donald P. Watts, William A. Wright, H.E. |
author_sort |
Ashworth, Allan C. |
title |
Plant and Insect Fossils at Norwood in South-Central Minnesota: A Record of Late-Glacial Succession |
title_short |
Plant and Insect Fossils at Norwood in South-Central Minnesota: A Record of Late-Glacial Succession |
title_full |
Plant and Insect Fossils at Norwood in South-Central Minnesota: A Record of Late-Glacial Succession |
title_fullStr |
Plant and Insect Fossils at Norwood in South-Central Minnesota: A Record of Late-Glacial Succession |
title_full_unstemmed |
Plant and Insect Fossils at Norwood in South-Central Minnesota: A Record of Late-Glacial Succession |
title_sort |
plant and insect fossils at norwood in south-central minnesota: a record of late-glacial succession |
publisher |
Cambridge University Press (CUP) |
publishDate |
1981 |
url |
http://dx.doi.org/10.1016/0033-5894(81)90128-9 http://api.elsevier.com/content/article/PII:0033589481901289?httpAccept=text/xml http://api.elsevier.com/content/article/PII:0033589481901289?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400021645 |
long_lat |
ENVELOPE(-140.604,-140.604,61.499,61.499) |
geographic |
Klutlan Glacier Yukon |
geographic_facet |
Klutlan Glacier Yukon |
genre |
Tundra Yukon |
genre_facet |
Tundra Yukon |
op_source |
Quaternary Research volume 16, issue 1, page 66-79 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/0033-5894(81)90128-9 |
container_title |
Quaternary Research |
container_volume |
16 |
container_issue |
1 |
container_start_page |
66 |
op_container_end_page |
79 |
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1801382981754945536 |