MAIN MORAINIC SYSTEM OF THE SCIOTO LOBE. 395 



from Fredericktown, there being- just south from North Liberty and Jelloway 

 a series of drift knolls and drift ridges 10 to 20 feet high. Eastward from 

 North Liberty the drift knolls set in at the very border of the high ridge 

 that seems to be driftless, but westward from this ^^llage there is an outlying 

 belt of thin drift. As noted above, the morainic features within the tract 

 lying between the main moraine and the glacial boundary south of the 

 abrupt turn in the boundary are not so clearly outlined as in the main 

 moraine, yet scarcely a square mile occurs which does not contain drift 

 knolls of rather sharp contour. The whole may perhaps be considered a 

 morainic tract formed during the brief space in which there was lobation on 

 the south border of the nearly driftless highland. In presenting morainic 

 features it diflFers from the tract with thin drift which lies on the border of 

 the highland, there being in the latter little or no aggregation in knolls 

 or ridges. 



Betweei: Mount Vernon and Newark the moraine presents marked 

 differences in topography. For 5 or 6 miles, perhaps more, on its western 

 border it has closely aggregated knolls and ridges constituting a con- 

 tinuous, well-defined moraine. East of this main belt the knolls and ridges 

 of drift are very unequally distributed, there being areas of a square mile 

 or more where drift knolls are as closely aggregated as in the main belt; 

 but equally extensive tracts appear which have very few knolls. No 

 decided differences in age were detected between the main moraine and the 

 knolls of the district east of it; on the contrary, the one seems to be a close 

 successor of the other. The eastern part of the moraine shows strong 

 development from Mount Vernon southward as far as Utica along the east 

 side of the Baltimore and Ohio Railway; also about the Licking reservoir 

 south of Newark, and south from there to Pleasantville. The knolls in 

 these situations, though no higher than in bordering tracts, are more closely 

 aggregated and consequently give stronger expression to the belt. They 

 are ordinarily but 10 to 25 feet in height, are usually conical in form, and 

 have gentle slopes. 



In the vicinity of the Licking Valley, both to the northeast and south- 

 west of Newark, the di'ift is aggregated in knolls even where it fails to form 

 a continuous sheet, many of the elevated hills and ridges showing scarcely 

 a trace of drift, while the lowland tracts among them are dotted with drift 

 knolls. In the district northeast of Newark these features are displayed to 



