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Paleobotany of Wisconsinan Interstadials, Eastern Great Lakes Region, North America1

Published online by Cambridge University Press:  20 January 2017

Albert A. Berti
Albert A. Berti*
Affiliation:
Department of Geology, University of Western Ontario, London, Ontario and Department of Geology, Royal Ontario Museum, Toronto, Ontario
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Abstract

This study concerns the pollen and plant macrofossils from Mid-Wisconsinan Interstadial sites within the Wisconsinan ice margin in eastern North America. The time period covered is from about 55,000 years BP to 22,500 years BP, an interval much longer than the postglacial. Sediments examined are principally those of large lakes deposited in the Erie and Ontario basins during intervals of ice retreat.

The Port Talbot I Interval (from about 55,000 to 50,000 years BP) in the Erie basin is characterized by pollen assemblages alternating from Pinus-dominated zones to ones with abundant Pinus, Quercus, and nonarboreal pollen. These assemblages are interpreted as indicating relatively warm and dry conditions. Mean July temperatures fluctuated between 15 and 21°C.

During the succeeding Port Talbot II Interval and Plum Point Interstadial, in both the Erie and Ontario basins, pollen assemblages are characterized by dominant Pinus and Picea. Characteristic macrofossils include needles of the boreal Picea and Larix and leaves of species with a more northerly distribution, such as Dryas integrifolia, Betula glandulosa var. glandulosa, Vaccinium uliginosum var. alpinum, and Salix herbacea. These fossil assemblages are interpreted as indicating cooler and moister conditions in a forest-tundra environment. Mean July temperatures fluctuated between 10 and 15°C during the Port Talbot II Interval and Plum Point Interstadial.

Type
Research Article
Information
Quaternary Research , Volume 5 , Issue 4 , December 1975 , pp. 591 - 619
Copyright
University of Washington

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Footnotes

1

Contribution No. 334, Department of Geology, University of Western Ontario.

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