THE LIFE OF GLACIAL LAKE CHICAGO 



105 



at Rochester, N. Y. Early in the lake history a vigorous forest of spruce also 

 gave a boreal aspect to the country. 



J. CORRELATION OF LOCAL 

 Lake Chicago Basin™ 

 Glenwood stage, 640-635 feet. 



Outlet at Chicago. 



Fluctuation of ice front. 

 Bowmanville stage, 590 feet. 



Outlet possibly north of Green Bay. 



(Possible relation to Lake Wayne.) 



Readvance of ice. 



(Possible second Glenwood stage.) 

 Calumet stage, 620-615 feet. 



Outlet at Chicago. 



Ice front reaches Straits of Mackinac 



and Lake Chicago unites with Lake 



Huron. A portion of the Toleston stage 



probably belongs to this episode. 



AND GREAT LAKES STAGES 68 

 Huron-Erie Basin 

 Highest Maumee, 790 feet. 



Outlet at Fort Wayne, Ind. 

 Lowest Maumee, 760 feet. 

 Outlet near Imlay, Mich., to Chicago. 

 Readvance of ice 

 Middle Maumee, 780 feet (L. Saginaw). 

 Outlet thru Imlay channel. 



Huron-Eric-Ontario Basin 

 Lake Arkona, 710-694 feet. 

 Outlet, Grand River to Chicago. 

 Readvance of ice. 

 Lake Whittlesey, 735 feet. 



Outlet, Grand River to Chicago. 

 Lake Wayne, 660 feet. 



Outlet past Syracuse to Hudson River. 

 Readvance of ice. 

 Lake Warren, 680 feet. 



Outlet, Grand River to Chicago. 

 Lake Lundy (Grassmere 640, Elkton 620 

 feet). 

 Outlet past Syracuse to Hudson River. { 



Chicago Basin 

 Toleston stage, 600-605 feet. 



Union of lakes. 

 Sag low water stage, 590 feet. 



Possibly dry land (Taylor). 

 H ammond stage, 600 feet. 



Outlet at Chicago. 

 Low water stage, 580 feet (or less) 



Probably dry land. 



Englewood stage, 592 feet. 

 Closing of Chicago outlet. 



Present stage, 580 feet. 

 Dry land and rivers. 



LAKE ALGONQUIN 



Huron-Ontario Basin 



First stage. 



Outlet to Lake Erie. 

 Kirkfield stage. 



Outlet thru Trent Valley. 

 Port-Huron-Chicago stage. 



Outlets at Chicago and St. Clair. 

 Closing stage. 



Outlet into Champlain Sea, via Ottawa 



Valley (North Bay). 

 Nipissing Great Lakes. 



Two outlet stage, North Bay and 



Port Huron. 

 Great Lakes. 



Outlet at Niagara Falls. 



e8 After Leverett and Taylor. 



69 The relation of the moraine near Milwaukee (Whitehall) and that near Two Rivers 

 (Manistee) to the rising of the water level succeeding the Bowmanville stage is not definitely 

 known The latter does not carry the high water beaches (60 and 40 feet) while the former 

 is said by Goldthwait to show traces of these beaches in Sheboygan County. The lake possi- 

 bly fell from the Glenwood to the Calumet level before the low water stage and the lake sub- 



