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Lead-210 and Pollen Geochronologies on Lake Superior Sediments

Published online by Cambridge University Press:  20 January 2017

Kenneth W. Bruland ,
Minoru Koide ,
Carl Bowser ,
Louis J. Maher  and
Edward D. Goldberg
Kenneth W. Bruland
Affiliation:
Scripps Institute of Oceanography, La Jolla, California 92037 USA
Minoru Koide
Affiliation:
Scripps Institute of Oceanography, La Jolla, California 92037 USA
Carl Bowser
Affiliation:
Department of Geology and Geophysics, University of Wisconsin, Madison, Wisconsin 53706 USA
Louis J. Maher
Affiliation:
Department of Geology and Geophysics, University of Wisconsin, Madison, Wisconsin 53706 USA
Edward D. Goldberg
Affiliation:
Scripps Institute of Oceanography, La Jolla, California 92037 USA
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Abstract

Rates of sedimentation in two Lake Superior deposits were determined by both ragweed pollen and 210Pb geochronologies. The former yields an average rate over the time since the first appearance of enhanced concentrations of the pollen as a consequence of human settlement. Sedimentation rates derived on these two bases can be brought into accord if the first appearance of ragweed pollen in the sediments was around 1830 and if the sedimentation rates have been uniform over the past century.

Type
Research Article
Information
Quaternary Research , Volume 5 , Issue 1 , March 1975 , pp. 89 - 98
Copyright
University of Washington

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