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Postglacial Diatom Stratigraphy in Relation to the Recession of Glacial Lake Agassiz

Published online by Cambridge University Press:  20 January 2017

J.C. Ritchie  and
L.K. Koivo
L.K. Koivo
Affiliation:
Scarborough College, University of Toronto, West Hill, Ontario, M1C 1A4, Canada
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Abstract

The sediment and diatom stratigraphy of a small pond on The Pas moraine, near Grand Rapids, Manitoba, reveals a change in sedimentary environment related directly to the last stages of Glacial Lake Agassiz. Beach sands were replaced by clay 7300 14C y. a., then by organic silt and, at 4000 14C y. a. by coarse organic detritus; the corresponding diatom assemblages were (I) a predominantly planktonic spectrum in beach sands, (II) a rich assemblage of nonplanktonic forms, and (III) a distinctly nonplanktonic acidophilous spectrum. These results confirm Elson's (1967) reconstruction of the extent and chronology of the final (Pipun) stage of Glacial Lake Agassiz. The sedimentary environments change from a sandy beach of a large lake at 7300 BP to a small, shallow eutrophic pond with clay and silt deposition from 7000 to 4000 BP. From 4000 BP to the present, organic detritus was deposited in a shallow pond that tended toward dystrophy.

Type
Research Article
Information
Quaternary Research , Volume 5 , Issue 4 , December 1975 , pp. 529 - 540
Copyright
University of Washington

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