Note sur un site à macrorestes végétaux tardiglaciaires au sud-ouest de Montréal, Québec
Two thin organic layers containing plant macrofossils of arctic-alpine taxa were found in shore deposits, attributed to the Champlain Sea, at an elevation of 110 m above present sea level, near Huntingdon (Québec) about fifty kilometres southwest of Montréal. A radiocarbon date of 10 480 ± 140 BP (B...
| Published in: | Géographie physique et Quaternaire |
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| Main Authors: | , , , |
| Format: | Text |
| Language: | French |
| Published: |
Les Presses de l'Université de Montréal
1985
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| Subjects: | |
| Online Access: | https://doi.org/10.7202/032587ar http://id.erudit.org/iderudit/032587ar |
| Summary: | Two thin organic layers containing plant macrofossils of arctic-alpine taxa were found in shore deposits, attributed to the Champlain Sea, at an elevation of 110 m above present sea level, near Huntingdon (Québec) about fifty kilometres southwest of Montréal. A radiocarbon date of 10 480 ± 140 BP (Beta-8270) was obtained on one of the organic layers. Geomorphic context, macrofossil flora and pollen analysis suggest that the organic layers were the result of a mix of plant remains from two distinct tundra habitats on a lateglacial strand. À une cinquantaine de kilomètres au sud-ouest de Montréal, dans la région de Huntingdon, des dépôts littoraux attribués à la mer de Champlain renferment, vers 110 m d'altitude, deux minces lits organiques fossiles contenant des macrorestes de type arctique-alpin. La datation au radiocarbone de l'un des lits organiques a donné un âge de 10 480 ± 140 BP (Beta-8270). Le contexte géomorphologique, l'identification de la flore macrofossile et l'analyse pollinique indiquent que les lits organiques résultent du mélange, sur un estran tardiglaciaire, de macrorestes provenant de deux habitats d'une toundra sise à proximité du site. |
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