INNER BORDER OF THE SCIOTO LOBE. 429 



coarseness. On its surface are occasional bowlders, and in places some clay 

 appears as a capping to the gravel and sand. The bordering plains are 

 underlain by till. 



THE CIRCLEVILLE ESKER. 



The Circleville esker hes along the east side of the Scioto River above 

 Circleville, in places forming its bluffs, while in other places it is a mile 

 from the river. Its general trend is about N. 25° W. to S. 25° E., but for 

 a couple of miles south from South Bloomfield it is nearly north to south. 

 Its length is about 9 miles, but it has several interruptions, as indicated 

 below. At its northern end there is a group of knolls which apparently 

 have some relation to it, but they are nmch inferior to the esker in size, 

 thus differing from the knolls at the corresponding end of the Pickerington 

 esker, which exceed it in size. 



The northernmost ridge of this Circleville esker belt is in section 3, 

 Harrison Township, Pickaway County. The ridge is about a mile long, 

 100 to 150 yards wide, and is 15 to 50 feet high. The northern third 

 trends about northwest to southeast, but the remainder trends north- 

 northwest to south-southeast, or even more nearly south. At the south 

 end of this ridge and just north of South Bloomfield is a knoll about one- 

 fourth mile long and half as wide, standing in its highest points 20 to 25 

 feet above the bordering plain. It trends north to south. Both east and 

 west of this one are a few knolls 10 to 15 feet in height. There is then an 

 interruption of the esker for a mile or more; but about a mile south of 

 South Bloomfield a gravel ridge begins abruptly with a height of fully 40 

 feet, its north end having a slope of 35° to 40°. It is a continuous ridge 

 for IJ miles, terminating near the mouth of Little Walnut Creek. Its 

 general height is 30 to 40 feet. It consists in places of a central ridge 

 with parallel flanking ridges, connected more or less closelv at one or both 

 ends with the main ridge, the width of tlie system, including flanking 

 ridges, being one-eighth mile, more or less. South from Little Walnut 

 Creek there is a gap of fully a mile, in which no esker ridge appears. 

 Much of this interval is overflow land, and it is possible that the esker was 

 once present, but has been washed away. South of this interval there is a 

 sharp ridge about one-fourth mile long and 30 to 40 feet high in its highest 

 parts. This is succeeded on the south by a gap of about one-half mile. 

 The esker there sets in again and is well developed for fully 4 miles. It 



