A new shoreline displacement model for the last 7 ka from eastern James Bay, Canada |
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Authors: | Ionel Florin Pendea André Costopoulos Colin Nielsen Gail Lois Chmura |
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Institution: | aDepartment of Geography, McGill University and Global Environmental and Climate Change Centre (GEC3), 805 Sherbrooke Street West, Montreal, Quebec H3A 2K6, Canada;bDepartment of Anthropology, McGill University, 855 Sherbrooke Street West, Montreal, Quebec H3A 2T7, Canada |
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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. |
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Keywords: | Glacio-isostatic rebound Relative sea level change Chronosequence Dinoflagellate cysts Pollen Tidal marsh Isolation stratigraphy |
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