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Plant and Insect Remains from the Wisconsinan Interstadial/Stadial Transition at Wedron, North-Central Illinois

Published online by Cambridge University Press:  20 January 2017

Clarke E. Garry ,
Donald P. Schwert ,
Richard G. Baker ,
Tim J. Kemmis ,
Diana G. Horton  and
Amy E. Sullivan
Clarke E. Garry
Affiliation:
Department of Biology, University of Wisconsin-River Falls, River Falls, Wisconsin 54022
Donald P. Schwert
Affiliation:
Department of Geology, North Dakota State University, Fargo, North Dakota 58105
Richard G. Baker
Affiliation:
Department of Geology and Botany University of Iowa, Iowa City, Iowa 52242
Tim J. Kemmis
Affiliation:
Department of Natural Resources, Geological Survey Bureau, 123 N. Capitol, Iowa City, Iowa 52242
Diana G. Horton
Affiliation:
Department of Botany, University of Iowa, Iowa City, Iowa, 52242
Amy E. Sullivan
Affiliation:
Mobil Oil Corporation, P.O. Box 5444, 1225 17th, Denver, Colorado 80202
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Abstract

Organic material exposed within a small swale fill in Pit 6 of the Wedron Silica Sand Co. near Wedron in LaSalle County, Illinois, includes well-preserved pollen, plant macrofossils, and insect remains. This material occurs in slackwater sediment in the lower part of the Peddicord Formation, which was deposited as existing valleys were dammed by fluvial aggradation during the initial late Wisconsinan advance of Laurentide ice into the Wedron area. Wood from the organic horizon has a radiocarbon age of 21,460 ± 470 yr B.P. (ISGS-1486). The pollen spectrum is dominated by Picea, Pinus, and Cyperaceae. Plant macrofossils comprise a mix of boreal-forest taxa, including Picea, Larix laricina, and the moss Campylium stellatum; subarctic species including Betula glandulosa, Empetrum nigrum, and Selaginella selaginoides; along with the predominantly arctic Vaccinium uliginosum var. alpinum, Dryas integrifolia, and Rhododendron lapponicum. The insect fauna contains the western montane ground beetle Opisthius richardsoni; several arctic-subarctic ground beetles including Diacheila polita, Helophorus sibiricus, and Pterostichus (Cryobius) caribou; and a diverse assemblage of insects that today inhabit the boreal forest. We interpret the biotic record to record a phase in the transition from closed boreal forest to open tundra as climatic conditions deteriorated in advance of continental glaciation.

Type
Articles
Information
Quaternary Research , Volume 33 , Issue 3 , May 1990 , pp. 387 - 399
Copyright
University of Washington

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