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A new Shoreline displacement model for the last 7 ka from eastern James Bay, Canada

Published online by Cambridge University Press:  20 January 2017

Ionel Florin Pendea ,
André Costopoulos ,
Colin Nielsen  and
Gail Lois Chmura
Ionel Florin Pendea*
Affiliation:
Department of Geography, McGill University and Global Environmental and Climate Change Centre (GEC3), 805 Sherbrooke Street West, Montreal, Quebec H3A 2K6, Canada
André Costopoulos
Affiliation:
Department of Anthropology, McGill University, 855 Sherbrooke Street West, Montreal, Quebec H3A 2T7, Canada
Colin Nielsen
Affiliation:
Department of Anthropology, McGill University, 855 Sherbrooke Street West, Montreal, Quebec H3A 2T7, Canada
Gail Lois Chmura
Affiliation:
Department of Geography, McGill University and Global Environmental and Climate Change Centre (GEC3), 805 Sherbrooke Street West, Montreal, Quebec H3A 2K6, Canada
*
*Corresponding author. Fax: +1 514 398 7437.E-mail address:[email protected] (I.F. Pendea).
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Abstract

The shoreline displacement history of the eastern James Bay lowlands in the last 7 ka has been investigated by means of AMS radiocarbon dating of sediments cored from wetlands. We present twelve radiocarbon dates on macrofossils from six sites spread along a gradient of increasing land age and elevation. Palynomorph analysis (pollen, spores, and dinoflagellate cysts) was used to define the isolation stratigraphy. During the last 7 ka the shoreline elevation has regressed at a decreasing rate. The rate of shoreline emergence was initially rapid (6. 5 m/ 100 yr) between 6850 and 6400 cal yr BP then slowed down to 1.4– 2 m/ 100 yr during the late Holocene. Examination of previous relative sea level data based upon mollusc shells reveals high levels of uncertainty that mask potential temporal variability.

Keywords

Glacio-isostatic reboundRelative sea level changeChronosequenceDinoflagellate cystsPollenTidal marshIsolation stratigraphy
Type
Original Articles
Information
Quaternary Research , Volume 73 , Issue 3 , May 2010 , pp. 474 - 484
Copyright
University of Washington

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