436 GLACIAL FORMATIONS OF ERIE AND OHIO BASINS. 



in places on bordering tracts . they are numerous, so that there does not 

 appear to be a well-defined belt. Probably the bowlders were deposited 

 during the retreat of the ice from west to east, surface bowlders having 

 accumulated on the ice sheet along a line in harmony with the direction of 

 movement. 



Another tract where bowlders are sufficiently numerous to excite 

 remark lies between Midway and Mount Sterling. The writer did not 

 examine this district so carefully as the other, but has the impression that 

 it will be even more difficult here to make out a belt or train of bowlders 

 than in the district just described. Aside from these two districts no exten- 

 sive tracts were reported where bowldei's are conspicuous; they are, how- 

 ever, not rare in any part of this inner border plain except where silt 

 deposits occur, as noted above. 



INNER BORDER PHENOMENA IN THE SHOULDER. 



In the shoulder east of the main Scioto lobe, there is, between the 

 main morainic system and a series of moraines which follow the continental 

 divide, a hilly district covering southwestern Smnmit, southeastern Medina, 

 northern Wayne, and central Ashland counties, in which occasional small 

 tracts were noted that have morainic topography, but the greater part of 

 which is nearly free from drift knolls and covered with but a thin drift 

 deposit. It is thought that these small morainic tracts are the correlatives 

 of the feeble though well-defined moraines which appear in the northern 

 part of the Scioto Basin, and which are described below under the name of 

 Powell and Broadway moraines, since they lie, as those moraines do, between 

 the main morainic system and that series. These nn)raines are easily trace- 

 able in the smooth Scioto Basin, but in this hilly district would be recognized 

 only by very careful tracing. The ice sheet appears to have formed less 

 continuous ridged or morainic deposits in this district than in the Scioto 

 Basin, for, after careful examination, the writer has been unable to connect 

 into a belt the several patches of morainic topography which were observed. 

 The drift has an average thickness of scarcely 20 feet, on uplands, and is 

 composed mainly of till. It is thinner and more compact than the drift in 

 the moraines to the south. The valley drift has greater thickness. That 

 found in tributaries of the Tuscarawas and of Killbuck and Mohican creeks, 

 which head in the moraines north of this district, is considered in connection 

 with those moraines. 



