578 GLACIAL FOKMATIONS OF ERIE AND OHIO BASINS. 



Byron Hadsell's, near St. Joe, and about 10 rods east of St. Joseph River, 

 is 110 feet in depth. It encountered nothing but sand and gravel. This 

 well is outside the moraine, otherwise it might have penetrated some till. 



From the foregoing sections it is apparent that the upper portion of 

 the drift is mainly till, while the lower portion, so far as discovered, is more 

 larg-ely sand and gravel. 



OUTER BOEDER PHENOMENA. 



The portion of the Fort Wayne moraine south of Lake Erie stands so 

 near the divide between the Lake Erie and the Ohio drainage that the 

 glacial waters appear to have found a ready escape into tributaries of the 

 Ohio. 



There is likely to have been a small lake in the Cuyahoga Valley dis- 

 charging southward past the "Akron Summit" to the Tuscarawas, at an 

 altitude of about 965 to 970 feet. 



The Sandusky drainage basin also is likely to have had a small lake 

 in the soiithern portion discharging at first southward to the Scioto through 

 the "Tymochtee Pass," at an altitude about 910 feet above tide. The dis- 

 charge was probably changed to a westward outlet when the ice front had 

 receded a little from the moraine and offered a lower line of escape. This 

 lake may have received the glacial waters from points on the ice margin as 

 far east as the head of Brokensword Creek. The writer's studies in that 

 region were rather hurried, and the presence of the lake is inferred on theo- 

 retical grounds alone, but more detailed studies ought to bring to light 

 features that will prove its existence. 



From Dunkirk, Ohio, to Fort Wayne, Ind., the glacial drainage appears 

 to have followed the border of the ice sheet westward in a current inferred 

 to have been sluggish from the fact that the portions of the valleys of 

 Ottawa River (or Hog Creek) and St. Marys River which follow the outer 

 border of the Fort Wayne moraine are not characterized by gravel and 

 sand deposits, such as should accompany a good current. There is a thin 

 deposit of silt on the surface of the plains bordering these valleys, ranging 

 in depth from a few inches to several feet, which seems referable to the 

 flooding of the plains by sluggish waters. 



The northwestern limb of this moraine being followed somewhat closely 

 by the St. Joseph River from the Michigan-Ohio line to Fort Wayne, Ind., 



