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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*
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:ionel.pendea@mail.mcgill.ca (I.F. Pendea).

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.

Type
Original Articles
Copyright
University of Washington

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