18 ILLUSTEATIONS. 



Page. 



Figure 12. Map of Point Edward spit 483 



13. Map showing distributaries of Detroit River at Detroit and delta in Lake Rouge 485 



11. Diagrammatic map showing the relation of the Whittlesey and Algonquin hinge lines to the extreme 



border of the Wisconsin ice sheet 503 



15. Map showing northward shiftiag of the hinge lines 505 



INSERT. 



Approximate time relations of ice lobes, morainic systems, and moraines of the Wisconsin stage of glaciation in 

 Indiana and southern Michigan 30 



