How Old Is Niagara
The article cites Dr. J. W. Spencer estimating Niagara Falls age at 39 000 years based on a current retrocession rate of 4.2 feet per year over about 227 years and a prior slower rate when Lake Erie drained only a fraction of the water. It notes gorge widening above Foster's Flat marking the time when other Great Lakes began to discharge into Lake Erie and that cutting with all four lakes lasted about 3 500 years.
MENTIONED IN THIS ARTICLE
Niagara
J. W. Spencer
Lake Erie
Foster's Flat
Great Lakes
Spencer
England
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