ST. JOHNS OR SALAMONIE MORAINE. 



511 



here includes both the Salamonie and the Mississinawa behs, and wliose 

 coiu'se was outlined in the discussion of the Mississinawa moraine. 



It niay be of interest to note the jjosition of this moraine with refer- 

 ence to the great drainage systems. From the point where the moraine 

 coimects with the moraines of the Scioto Basin, near the head of the Scioto 

 River in Hardiia County, Ohio, westward to the Miami Canal, it follows, 

 and to some extent constitutes, the divide between the St. Lawrence and 

 the Mississippi drainage basins, but westward from the Miami Canal its 

 course lies within the Mississippi Basin until the head of Eel River is 

 reached, in northwestern Allen County, Ind. From this point northward it 

 lies within the St. Lawrence Basin, and for a few miles in Steuben Countv 

 it occupies the divide between Lakes Michigan and Erie. 



Where well defined, the moraine presents an abrupt outer l^order 

 relief ranging from 20 to 50 feet and a ridg-e so nearly continuous that but 

 few streams cross it. A few points along the crest of the ridge rise 75 feet 

 or more above the outer border plain and 25 to 30 feet above the general 

 level of the crest. On the inner border there is a iiearl}^ continuous 

 descent for several miles from the crest of the moraine, but the relief is 

 less apparent to the eye when approached from this border than from the 

 outer border. The following altitudes taken from the profiles of railways 

 crossing the moraine furnish precise data as to the relief on these lines: 



Tahle shoioing relief of Snlamonie moraine along certain ra.ihoay lines. 



