Abstract

South of the Lake Algonquin hinge line through Bad Axe, Michigan, and Grand Bend, Ontario, a prominent lake terrace at about 183 m (600 ft) has been previously attributed to formation by Lake Algonquin about 11 000 years ago. Radiocarbon dates and mollusc assemblages in near-shore lacustrine sediments on the terrace indicate formation by the Nipissing stage, about 5000 years ago. The gradual and vigorous Nipissing transgression extensively removed and destroyed the older Algonquin features.

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