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Geology and Paleoecology of a Mid-Wisconsin Peat from the Queen Charlotte Islands, British Columbia, Canada

Published online by Cambridge University Press:  20 January 2017

Barry G. Warner ,
John J. Clague  and
Rolf W. Mathewes
Barry G. Warner
Affiliation:
Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
John J. Clague
Affiliation:
Geological Survey of Canada, 100 West Pender Street, Vancouver, British Columbia V6B 1R8, Canada
Rolf W. Mathewes
Affiliation:
Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
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Abstract

A peat bed on east-central Graham Island of the Queen Charlotte Islands occurs within a nonglacial fluvial succession that is both overlain and underlain by glacial deposits. Radiocarbon dates of 27,500 ± 400 and 45,700 ± 970 yr B.P. at the top and base of the peat, respectively, indicate that it was deposited during the mid-Wisconsin nonglacial interval. The peat is the first documented mid-Wisconsin organic deposit in northern coastal areas of British Columbia. Three local pollen zones are represented. The lowest zone (PM-1) is restricted to sandy silt directly underlying the dated peat. Very high Cyperaceae and moderate Poaceae pollen percentages characterize zone PM-1, and a variety of other herbs are common, suggesting an open landscape rather than a forested one. The middle zone (PM-2) is characterized by abundant pollen of Picea, Tsuga mertensiana, and Cyperaceae, and also contains pollen of Abies, a genus now absent from the Queen Charlotte Islands. Graham Island probably had extensive forests at this time, but abundant pollen and macrofossils of Cyperaceae and emergent aquatics such as Hippuris vulgaris, Veronica scutellata, Potentilla palustris, and Menyanthes trifoliata indicate that there also were open wetland areas. Zone PM-3 also contains abundant arboreal pollen. Large amounts of Sphagnum spores and Selaginella selaginoides megaspores indicate succession of the wetland area at the sample site to a peat bog. Paleoecological analysis of the data suggests that subalpine vegetation elements were depressed by at least 400 m, probably due to a cooler climate. Probable modern analogs in southeastern Alaska and the presence of Abies (probably A. amabilis) indicate that precipitation was higher on eastern Graham Island during the mid-Wisconsin than at present.

Type
Research Article
Information
Quaternary Research , Volume 21 , Issue 3 , May 1984 , pp. 337 - 350
Copyright
University of Washington

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