Science, Geology and Physics 



Wright, George Frederick. Niagara gorge as a chronometer. 1885 

 (Sci., May 15, 1885. 5:399-401.) W"« h < 



1886 



CLAYPOLE, E. W. The old gorge at Niagara. (Science n. s., 18 86 

 Aug. 13, 1886. 8:236.) cla yp° Ie 



Gives an account of the discovery of the limestone ledge at the bottom 

 of the old Niagara gorge, 1 00 feet above the present river level, which 

 the author contends proves that if the course of the river went this way its 

 bed was far above the present level. 



Gilbert, Grove Karl. The place of Niagara Falls in geologic 1886 

 history. [Abstract.] (Proc. A. A. A. S. Aug., 1886. 35 :222-223.) Gilbert 



Treats of the rate of recession of Niagara Falls. 



HoVEY, H. C. Niagara river gorge and falls. (Sci. Am. sup., 1886 

 Sept. 11, 1886. 22:8917.) Hovey 



A review of papers read at the Buffalo meeting of the American Asso- 

 ciation for the Advancement of Science, August, 1 886, which gave 

 special attention to Niagara. The resume of Pohlman's paper is deemed 

 worth quoting. 



If there were ever any falls at Lewiston, which is now doubted 

 by many, they could not have been very great till after the sub- 

 sidence of Lake Ontario. . . . He [Professor Comstock, of 

 Cornell University] also held that there was never any fall at 

 Lewiston, the rocks being too thin and friable to afford enough 

 resistance to allow the formation of anything more than the 

 rapids of a swift river. 



The origin of the Niagara River, according to the able and 

 ingenious paper read by Dr. Pohlman, of Buffalo, carries us back 

 to pre-glacial times. . . . 



Let me briefly recapitulate in Dr. Pohlman's words: " In the 

 pre-glacial time, a stream filled the valley of the Tonawanda, 

 whose surplus waters formed an outlet along the gorge of the 

 present Niagara River, from the falls to the whirlpool, and 

 thence by way of the now drift-filled valley of the St. Davis 

 into the Ontario. After this valley had been closed during the 



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