The Duration of Niagara Falls And the History of the Great Lakes

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The waters in the Ontario basin did not pause long at this high level, but gradually sank to the Iroquois plain 300 feet below the plain of Lundy beach. The Iroquois beach marks a long rest during which the early Niagara cascaded only 200 feet from the upper to the lower lake, and Erie formed only the lakelet as shown on the map (fig 13).
Upon the dismemberment of Warren water, the Algonquin basin emptied its waters, at first through a strait by way of Lake Nipissing, and later by a river in th
...e same region into the Ottawa valley. There was no connection between the Huron basin and the Erie until after the terrestrial deformation following the Iroqouis episode. Then the Huron waters overflowed the southern rim of its basin and emptied into the youthful Lake Erie. The outlet of the Erie basin was also raised so that the plains at the head of its basin were flooded. This tilting has continued until the beach in the vicinity of the falls is now raised about 160 feet above its submerged extension near Point Pelee.

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