Although post-glacial marine sediments of late Wisconsinan and early Holocene age are common in e... more Although post-glacial marine sediments of late Wisconsinan and early Holocene age are common in eastern Canada and the northeastern United States, remnants of older Pleistocene marine sediments are scarce. A fossiliferous marine clay that predates the classical Wisconsinan was recently discovered in the St. Lawrence Valley. A dominantly estuarine environment is inferred from the geochemistry of the shells (δ18O = −7.1) and from benthic foraminifer and ostracode assemblages. The clay indicates a marine invasion (Cartier Sea) shallower and probably shorter than that during the upper late Wisconsinan Champlain Sea episode (12,000–9,500 yr B.P.). The pollen content shows that regional vegetation during the marine episode began as open tundra, then became a Betula and Alnus crispa forest, reached a climatic optimum with Quercus, Corylus, and Abies, and concluded as a Pinus/Picea boreal forest. A corrected infrared stimulated luminescence age of 98,000 ± 9000 yr is compatible with the epi...
RÉSUMÉ Dans le ravin du stratotype, les Sédiments de Saint-Pierre sont composés de six lithozones... more RÉSUMÉ Dans le ravin du stratotype, les Sédiments de Saint-Pierre sont composés de six lithozones dont trois sont décrites pour la première fois. La microflore et les macrorestes des six lithozones révèlent une végétation à caractère boréal évoquant un climat plus frais que celui…
lands (Fig. 1) over the margins of the St. Lawrence basin, Although post-glacial marine sediments... more lands (Fig. 1) over the margins of the St. Lawrence basin, Although post-glacial marine sediments of late Wisconsinan and of Hudson and Ungava Bays, and on the Atlantic Coast (ref. early Holocene age are common in eastern Canada and the northin Hillaire . Compared to these eastern United States, remnants of older Pleistocene marine sediextensive data on late Wisconsinan and Holocene, the remments are scarce. A fossiliferous marine clay that predates the nants of older glacio-isostatic seas are much scarcer. South classical Wisconsinan was recently discovered in the St. Lawrence of Hudson Bay, the marine fossiliferous clay member of the
Although post-glacial marine sediments of late Wisconsinan and early Holocene age are common in e... more Although post-glacial marine sediments of late Wisconsinan and early Holocene age are common in eastern Canada and the northeastern United States, remnants of older Pleistocene marine sediments are scarce. A fossiliferous marine clay that predates the classical Wisconsinan was recently discovered in the St. Lawrence Valley. A dominantly estuarine environment is inferred from the geochemistry of the shells (δ18O = −7.1) and from benthic foraminifer and ostracode assemblages. The clay indicates a marine invasion (Cartier Sea) shallower and probably shorter than that during the upper late Wisconsinan Champlain Sea episode (12,000–9,500 yr B.P.). The pollen content shows that regional vegetation during the marine episode began as open tundra, then became a Betula and Alnus crispa forest, reached a climatic optimum with Quercus, Corylus, and Abies, and concluded as a Pinus/Picea boreal forest. A corrected infrared stimulated luminescence age of 98,000 ± 9000 yr is compatible with the epi...
RÉSUMÉ Dans le ravin du stratotype, les Sédiments de Saint-Pierre sont composés de six lithozones... more RÉSUMÉ Dans le ravin du stratotype, les Sédiments de Saint-Pierre sont composés de six lithozones dont trois sont décrites pour la première fois. La microflore et les macrorestes des six lithozones révèlent une végétation à caractère boréal évoquant un climat plus frais que celui…
lands (Fig. 1) over the margins of the St. Lawrence basin, Although post-glacial marine sediments... more lands (Fig. 1) over the margins of the St. Lawrence basin, Although post-glacial marine sediments of late Wisconsinan and of Hudson and Ungava Bays, and on the Atlantic Coast (ref. early Holocene age are common in eastern Canada and the northin Hillaire . Compared to these eastern United States, remnants of older Pleistocene marine sediextensive data on late Wisconsinan and Holocene, the remments are scarce. A fossiliferous marine clay that predates the nants of older glacio-isostatic seas are much scarcer. South classical Wisconsinan was recently discovered in the St. Lawrence of Hudson Bay, the marine fossiliferous clay member of the
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