C chronology for ice retreat and inception of Champlain Sea in the St. Lawrence Lowlands, Canada |
| |
Authors: | Pierre JH Richard Serge Occhietti |
| |
Institution: | Département de géographie, Université de Montréal, C.P. 6128 Centre-ville, Montréal, Canada H3C 3J7 |
| |
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 chronology Pleistocene– Holocene transition Glacial Lake Candona Champlain Sea Deglaciation Glacial meltwater influx |
本文献已被 ScienceDirect 等数据库收录! |
|