308 R. Chalmers — Pleistocene Marine Shore-Lines^ etc. 



972 feet.* Prof. Spencer extended his levellings still farther 

 to the east, along the northern base of the Adirondacks, find- 

 ing what he regarded as beaches at different levels up to 1200 

 and 1350 feet. The evidence as to these was, however, dis- 

 puted by Prof. G-ilbert.f 



Mr. F. B. Taylor, who has examined a number of the beaches 

 in the region of the Great Lakes, regards the Iroquois as coin- 

 ciding with other beaches to the west, and reports some evi- 

 dence of marine shore-lines from the Lake Champlain basin. 

 On this point he argues thus : " But if the sea filled the Hudson- 

 Cham plain trough, attaining a height of 700 feet or more at 

 the north end of Lake Champlain, it is impossible to avoid the 

 inference that this was the time of the formation of the Iro- 

 quois, Chippewa and Herman beaches.":): 



Baron de Geer, while in America, found a marine shore-line 

 in the Lake Champlain valley, at St. Albans, Vermont, 658 

 feet high.g 



The distance between the levelled points of the marine 

 shore-line of the St. Lawrence valley and of the east end of 

 the Iroquois beach is still so great, however, that it seems 

 scarcely permissible to draw any inferences as to their probable 

 relation to each other based on the levels now at hand. But if 

 the terraces at the north end of Lake Memphremagog are 

 really marine, and have corresponding terraces on the north- 

 west side of the intervening mountains at or near the same 

 height, then the two high-level beaches referred to — the St. 

 Lawrence and the Iroquois — would thus have their levelled 

 points brougbt much nearer to each other, and may, indeed, 

 prove to be one and the same beach. In that case, as the St. 

 Lawrence beach is certainly marine, there would be no escape 

 from the conclusion that the Iroquois beach is also marine. 

 But further detailed examination and levelling are required to 

 satisfactorily determine the question. 



Ottawa, February 4th, 1896. 



*This Journal, vol. xl, 1890, pp. 443-451. The heights of the Iroquois beach , 

 etc., are referred to sea level, Lake Ontario being 247 feet high, according to the 

 U. S. Lake Survey. 



f Bulletin Geol. Soc. of America, vol. iii, pp. 488-495. 



% This Journal, vol. xlix, 1895, pp. 249-270. 



§ Proc. Boston Soc. of Natural History, vol. xxv, 1892, p. 469. 



