Winchell, Alexander, 1824-1891 · Chicago, S.C. Griggs and company · leaf 399
n unknown, but probably small, portionof the gorge above thewhirlpool. Mr. Belt as-sumes, however, in roundnumbers, that 20,000years express the maxi-mum limit of time sincethe commencement of thenew gorge at Queenston.His own assumption of therate of recession wouldgive for the three miles be-low… … Fig. 53. Mr. James T. Gardner, Niagara Gorge-New. •Old and ♦Thomas Belt, (^uar. Jour, of Science, April, 1875. THE EARTH. 371 Director of the New York State Survey, has given atten-tion to the rate of recession of Niagara Falls, reproducingHennepins narrative and illustration, and the map of…
Nebular hypothesis · Cosmogony
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