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Plant and Insect Fossils at Norwood in South-Central Minnesota: A Record of Late-Glacial Succession1

Published online by Cambridge University Press:  20 January 2017

Allan C. Ashworth ,
Donald P. Schwert ,
William A. Watts  and
H.E. Wright
Allan C. Ashworth
Affiliation:
Department of Geology, North Dakota State University, Fargo, North Dakota 58105
Donald P. Schwert
Affiliation:
Department of Geology, North Dakota State University, Fargo, North Dakota 58105
William A. Watts
Affiliation:
Limnological Research Center, University of Minnesota, Minneapolis, Minnesota 55455
H.E. Wright
Affiliation:
Limnological Research Center, University of Minnesota, Minneapolis, Minnesota 55455
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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.

Type
Original Articles
Information
Quaternary Research , Volume 16 , Issue 1 , July 1981 , pp. 66 - 79
Copyright
University of Washington

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Footnotes

1

Contribution 227, Limnological Research Center, University of Minnesota.

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