o { 

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S\ (< 







\j? 



^^ 



J -f 











/ J- ■■..; -J >^^ 



*y 









V 





' 













Kk«.£ „..^a e 











'••-gpS--^ Scale 





Ft 



trayt ^\ 





^y, ,1 ^»*^ „ jy 5 „ «WMi_ 





Fig. 115— Lake Whittlesey, with correlative ice border. (Map by Leverett.) 



Fig. 116— Lake Warren, with probable correlative ice border. (Map by Leverett.) 











Nipissinjj Great Lakes 











with 1 sob ases 











Scale 



%:;.- : 



$f s?~ 



""/ 





3^ -v J5^^ iail ^U 



Fig. 117 — Nipissing Great Lakes and Cham plain 

 above sea level of the highest exposed shore, 

 by Taylor and Goldthwaite. 



Numerous isobases give altitude 

 of Michigan and Huron brains 



