Elevations at the base of the shore cliff attributed to glacial Lake Algonquin are anomalously low, by ~10–15 m, between Kincardine and Port Elgin, Ontario. Weak remnant bluff-face benches, a hanging terrace of Algonquin age along Underwood Creek, and an incipient gravel foreland all record Main Algonquin water levels through much of this interval. It is suggested that subtill sand and gravel, weakly resistant to wave erosion, allowed the shoreline position to remain nearly constant as water levels fell through the "Upper Group" of Algonquin beaches.

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