BEACHES OF LAKE MAUMEE. 725 



Summit street, in Ypsilanti, is also 790 feet, as determined by citj" engineer's 

 levels. Farther north, near Plymouth, the aneroid indicates that the altitude 

 still remains at 790 feet. The next railway measurement is near Birming- 

 ham, 20 miles north of Detroit and 65 miles from Fairfield, where an 

 electric-railway survey shows it to be 809 feet. Ten miles farther north, 

 at Rochester, an electric-railway survey gives it an altitude of 820 feet. 

 The second beach there is 780 feet. Twenty-five miles farther north, near 

 the Imlay outlet, the second beach has an altitude of 849 feet, as determined 

 by Spencer from the railway station at Imlay.^ The marked differential 

 uplift seems, therefore, to set in between Plymouth and Birmingham, about 

 latitude 42° 30'. 



The apparent exceptional altitude near the Ohio-Michigan State line is 

 a matter concerning which an opinion can scarcely be ventured in the 

 present state of knowledge. Had the beach terminated there just outside 

 the Defiance moraine some reason might be found for attiibuting the 

 increase in altitude to the attraction of the ice sheet; but the fact that the 

 beach continues farther and seems to become a little lower unsettles this 

 view to some degree. There is need for more accurate as well as more 

 numerous determinations of level to make certain whether the beach 

 declines a little in passing north from Fairfield. The altitude of the neigh- 

 boring parts of the Belmore beach may prove of service in settling the 

 question of ice attraction. Should the Belmore beach show a corresponding 

 exceptional altitude in the vicinity of the Ohio-Michigan line it would 

 strongly oppose the view that ice attraction had been influential in giving 

 the Maumee beach its altitude, and would indicate that crust warping was 

 the cause, for ice attraction can not be supposed to liave had the influence 

 upon that part of the Belmore beach that it might have had upon this part 

 of the Maumee, as the ice sheet had probably withdrawn about to the limits 

 of Lake Huron and. had become greatly reduced in thickness before the 

 Belmore beach was formed; but on this beach careful measurements have 

 not been made. Until refined measurements have been made on each of 

 the beaches it seems hazardous to venture an opinion on this point. 



The second beach seems to stand about 760 to 765 feet above tide from 

 the Fort Wayne outlet northeastward to Bryan, Ohio, and to be no higher 



1 Am. Jour. Sci., 3d series, Vol. XLI, 1891, p. 209; see also F. B. Taylor: Bull. Geol. Soc. America, 

 Vol. VIII, 1897, p. 37. 



