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Prior to about 1963 it was generally accepted that northern New England and adjacent Canada were progressively deglaciated from southeast to northwest during Late Pleistocene time. R. Chalmers and E. Antevs thought differently, but their views were not seriously considered, although their models were basically correct as we understand the deglaciation pattern today. Since about 1963 abundant evidence has accumulated that demonstrates that the Laurentide Ice Sheet was partitioned by a marine calving embayment that advanced up the St. Lawrence Lowland to the Ottawa area at least by 12,800 years B.P. This event left ice sheet remnants over much of...

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