. Cutler's guide to Niagara Falls, and adjacent points of interest. --. s of fact was so slender that they were hardlymore than guesses. The first estimate, with a better found-ation, was made by Dr. Julius Pohlman. who took accountof the measured rate of recession and the influence of theold channel at the Whirlpool; he thought the river not olderthan years. Dr. J. W. Spencer, adding to these fac-tors the variations in the rivers volume, computes therivers age as 32,000 years. Mr. Warren Upham, havingthe same facts before him. thinks 7,000 years a more reason-able estimate. And Mr. F. B
. Cutler's guide to Niagara Falls, and adjacent points of interest. --. s of fact was so slender that they were hardlymore than guesses. The first estimate, with a better found-ation, was made by Dr. Julius Pohlman. who took accountof the measured rate of recession and the influence of theold channel at the Whirlpool; he thought the river not olderthan years. Dr. J. W. Spencer, adding to these fac-tors the variations in the rivers volume, computes therivers age as 32,000 years. Mr. Warren Upham, havingthe same facts before him. thinks 7,000 years a more reason-able estimate. And Mr. F. B. Taylor, while regarding thedata altogether insufficient for the problem, is of opinionthat Mr. Uphams estimate should be multiplied by a numberconsisting of tens rather than units, thus estimates foundedon substantially the same facts range from thousands ofyears to hundreds of thousands of years. For mvself, Iam disposed to agree with Mr. Taylor, that no estimate vetmade has great value, and the best result obtainable mayperhaps be only a rough approximation. (36). ^^ -? ^J?- - ~,4W ^^-fc
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