CLEVELAND MORAINE. 629 



On the slope west of Pymatuning Creek the drift assumes the form of 

 low swells, seldom hig-her than 10 feet, but so numerous as to give it a 

 decidedly raorainic aspect. Along Pymatuning Creek, above the large 

 knoll just described, drift knolls are rare for a couple of miles. Several 

 drift ridges, occupying altogether a width of a mile or so, here cross 

 the valley in an east-to-west direction, filling it so completely that the 

 stream is compelled to wind about to find a passage through the belt. 

 The ridges rise abruptly to a height of 20 to 30 feet, and among them are 

 sags and basins 10 to 20 feet in depth, nearly surrounded bj' ridges and 

 knolls. These ridges, continuing eastward, constitute the outer of the 

 three lines which pass from Pymatuning Creek to Shenango River. 



On the uplands, between the Pymatuning and Shenango,' there are 

 usually low knolls, 10 to 15 feet in height, some of which are rather sharp, 

 and among them are a few basins. 



There are several gravel knolls on the slope east of the Shenango 

 River, about a half mile east of Jamestown, Pa. The largest one is 30 to 

 35 teet high and is surrounded by several smaller ones. Above Jamestown 

 the knolls are 10 to 20 feet in height and of varying degrees of sharpness, 

 from very abrupt to those of gradual slope. A few peculiar ridges 

 were noted near Jamestown which merit individual description. One east 

 of Kinneys Corners, in the southwest corner of Crawford County, Pa., 

 bears some resemblance to an esker. For about a fourth mile from its 

 western end it is only 5 or 6 feet in height and 100 feet in breadth. It 

 here enlarges to a knoll 15 feet or more in height and pei'haps 200 feet in 

 diameter at the base. From this knoll a low ridge continues southeastward 

 a short distance and then disappears. There are, however, for a half mile 

 farther, in line with the ridge, occasional low, short ridges which were 

 probably formed in connection with it. This ridge stands on a slope 

 that descends eastward. A similar esker-like ridge was found near the Lake 

 Shore and Michigan Southern Railroad, east of Jamestown. It is about 

 one-fourth mile long, 20 feet high, 100 to 150 feet in width, and trends 

 nearly west to east. A short, gravelly ridge, less like an esker than those 

 just mentioned, was observed on Jolm Patterson's land, 1^ miles southeast 

 of Westford, Pa. It is less than an eighth mile in length, about 15 rods in 

 breadth, and 20 feet in height. It is the only conspicuous drift feature in 

 that vicinity. All these ridges contain mucli assorted material. 



