Abstract
Isochrone maps on the late Wisconsin deglaciation of the Laurentide ice sheet enable estimates to be made of changes in the volume and area of the ice sheet. The average marginal recession between 12,000 and 7,000 BP is estimated as 260 m year-' and varies little between the northwest and southern margins. The northeastern margin retreated at 20 m year-' and the overall tendency was for the Laurentide ice sheet to migrate toward Baffin Island. Vertical mass loss required to produce marginal retreat of over 200 m year-' indicates values between 10 and 50 m of vertical ice wastage per year.
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