THE NAUTILUS. 



33 



Lake Erie, and possibly along the general course of the present 

 Maumee and Wabash Rivers towards the western sea. In a similar 

 way the ancient Saginaw River was a western-flowing stream, 

 extending from the highlands on the east across the Georgian Bay, 

 up the Saginaw Valley, and southwest towards the sea. And fur- 

 ther north a similar drainage was also established. According to 

 Fowke (3) the present course of the Ohio River is quite different 

 from that of the great river which drained that region in pre-glacial 



FIG. 3. 



times. The present course of the Ohio is made up of fragments of 

 ancient drainage beds united by connecting links forced through by 

 the glacial waters on the retreat of the ice. According to Grabau 

 the present bed of the Ohio is about 150 feet above the ancient bed 

 of the pre-glacial drainage, and according to Fowke the Great 

 Kanawha River, which is now a southern tributary of the Ohio, at 

 that time flowed northwesterly across southern Ohio into Indiana, 

 and presumably, either as a separate river or as a tributary of the 

 Dundas, flowed westerly towards the sea or into the Mississippi. 



