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14C chronology for ice retreat and inception of Champlain Sea in the St. Lawrence Lowlands, Canada

Published online by Cambridge University Press:  20 January 2017

Pierre J.H. Richard  and
Serge Occhietti
Pierre J.H. Richard*
Affiliation:
Département de géographie, Université de Montréal, C.P. 6128 Centre-ville, Montréal, Canada H3C 3J7
*
*Corresponding author. Fax: +1 514 343 8008.E-mail addresses:[email protected] (P.J.H. Richard)8 [email protected] (S. Occhietti).
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Abstract

AMS radiocarbon cross-dating of plant debris and marine shells trapped in a lake basin on Mount St. Hilaire (Québec, Canada) provides a direct assessment of a reservoir effect totaling ca. 1800 14C years during the early stage of Champlain Sea. Pollen-based extrapolation of bottommost ages on terrestrial plant macrofossils in sediments of this lake, and of another lake nearby support an estimate of 11,100 ± 100 14C yr B.P. for marine invasion in the Central St. Lawrence River Lowlands. Results indicate a 400–1000 years younger regional chronology of ice retreat, now congruent with the one inferred from the New England varve chronology. This is a summary of a longer paper to be published in French.

Keywords

14C chronologyPleistocene–Holocene transitionGlacial Lake CandonaChamplain SeaDeglaciationGlacial meltwater influx
Type
Short Papers
Information
Quaternary Research , Volume 63 , Issue 3 , May 2005 , pp. 353 - 358
Copyright
University of Washington

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