CORRELATIVES OF BLOOMINGTON" MORAINIC SYSTEM. 97 



sharpest knolls in the entire length of the morainic system are found in the vicinity, the most 

 prominent one perhaps being Crown Hill, which stands on the east bluff near the northern 

 edge of the city, rising about 125 feet above the gravel plain on its west side. The southeastern 

 part of Marion County is nearly all undulating, but the sharp knolls are restricted to a narrow 

 strip near the east bluff of White River, or rather at the eastern edge of a gravel plain 2 to 4 

 miles wide that leads down the valley. A single group of sharp knolls appears on the west 

 bluff of the river just north of the south line of the county. The river from Indianapolis 

 southward into northern Johnson County seems therefore to follow closely the outer edge of 

 the morainic system. 



Johnson County. — Near Glen Valley, at the south edge of Marion County, there is a ridge 

 about a mile in length, 75 to 125 feet in height, and scarcely one-fourth mile in width. North 

 of it about 2 miles, near Little Buck Creek, there are ridges 30 to 50 feet in height, and between 

 Lick Creek and the city of Indianapolis there are others. In northwestern Johnson County 

 along the south side of Pleasant Run a ridge 50 to 75 feet high and scarcely more than one-half 

 mile in width is practically continuous for 4 miles. From its eastern end near Greenwood a 

 less prominent but very bowldery morainic belt, composed of knolls and ridges 15 to 40 feet 

 in height which show a tendency to an east-west trend, runs eastward for about 8 miles. A 

 conspicuous ridge lies east of the pike south of Greenwood. A sag border or trough about 100 

 yards wide, standing but a few feet below the level of the bordering plain, runs along the south 

 border of this belt for several miles in the vicinity of Greenwood, separating the moraine from 

 the outer border plain. Possibly it was developed by border drainage, but quite as probably 

 it was occupied by the ice during the development of the moraine and is a glacial fosse, the 

 ice limit being on its south edge. 



Hancock and western Henry counties. — The ridge in northern Johnson County, just dis- 

 cussed, is at the south border of a broad undulating tract 12 to 15 miles in width that leads 

 from Marion County eastward across southern Hancock and northwestern Rush counties into 

 Henry County, its northern limit being near the Cleveland, Cincinnati, Chicago & St. Louis 

 Railway. ■ The belt as a whole trends nearly west and east, but individual ridges have a northeast- 

 southwest trend and these govern the course of small streams to a marked degree. The eastern- 

 most ridge or undulating belt lies along the west side of Sixmile Creek ; a second belt lies west of 

 Brandywine Creek; a third lies west of Sugar Creek below its bend. Few knolls in Hancock 

 County exceed 20 feet and the majority fall below 10 feet in height. In southeastern Marion 

 County there are several square miles bearing closely aggregated knolls 15 to 30 feet high, and 

 winding ridges of irregular shape and height inclosing basins. Near Julietta, in the vicinity of 

 the Cincinnati, Hamilton & Dayton Railway in southeastern Marion County, a few knolls 

 rise 30 to 40 feet above the bordering districts. 



In Henry County the undulating belt narrows from about 12 miles at the western edge to 

 less than 3 miles in the vicinity of Mount Summit north of Newcastle. The knolls are somewhat 

 scattered where the belt is broad but show definite ridging and close aggregation as it narrows. 

 The moraine is very strong from a point near the meridian of Newcastle eastward into Ohio. 



Immediately west of Newcastle about 4 miles is the north end of a sharp gravel ridge which 

 forms the front of the moraine for 5 miles, terminating on the south at the village of Greensboro. 

 It lies along the east side of Duck Creek and rises abruptly about 50 feet above the swampy 

 plain through which the creek flows and about 20 feet above the plain on the east. In form and 

 constitution it is strikingly like an esker, but its position with respect to the moraine is not the 

 usual one. Instead of leading into the moraine from the inner border district it appears to have 

 been developed along the edge of the ice sheet. Between it and the gravel plain along East 

 White (Blue) River is a till plain of remarkable smoothness about 2 miles in width, but on its 

 western side the topography is morainic. 



Delaware and northern Henry counties. — In southeastern Delaware County the larger knolls 

 are chiefly along depressions or lowlands occupied by the small creeks which lead northward 

 34407°— 15 7 



