312 GLACIAL FORMATIONS OF ERIE AND OHIO BASINS. 



above the surrounding country. Several small knolls, also gra^'^elly, are 

 connected with it at the sides. Between this prominent knoll and the East 

 Whitewater River there are on the uplands low till swells 5 to 10 feet high, 

 while knolls of gravel 10 to 20 feet high characterize the drift in the valleys 

 and on their slopes. West of East Whitewater, on the uplands immediately 

 north of Brookville and about 3 miles from the city, there are both till and 

 gravel knolls, the largest having a height of about 20 feet. The knolls 

 are in several instances elliptical, but there appears to be no uniformity 

 of trend. 



On the inner border plain north from these knolls, in Franklin Countv, 

 few knolls occur that are as much as 10 feet in height. In southeastern 

 Fayette County the surface is very imeven, there being ridges and dry 

 valleys which are apparently partiall)' masked interglacial drainage 

 features. In various positions in these valleys and on the ridges and slopes, 

 swells 10 to 20 feet high occur, many of which are gravellj". In north- 

 eastern Fayette County and in Wayne County there are few knolls that 

 rise to a height of more than 10 to 15 feet, the only prominent exception 

 noted being a group in the vicinity of Doddridges Chapel, Washington 

 Township, Wayne County, whose highest members have a height of 40 to 

 50 feet. In northern Wayne County abrupt knolls 30 to 40 feet in height 

 are common, but it is probable that these belong to a later morainic belt 

 which crosses northern Wayne and northeastern Henry County in an east- 

 west dii'ection. 



STRUCTURE AND THICKNESS OF DRIFT. 



The soil of this moraine is strikingly in contrast with that of the tract 

 south of it. It is usually dark colored and loamy, with an admixture of 

 pebbles and sand, while that outside is a light-colored clay or silt with 

 scarcely a trace of sand and pebbles. In the morainic tract there are also 

 bowlders on the surface on upland tracts as well as along streams, but in 

 the outer border district none occur at the surface except along valleys or 

 on slopes where drainage erosion has carried away the silt or surface 

 deposits that had covered them. 



Throughout its entire course this moraine consists mainl}^ of till, but 

 is characterized by occasional gravelly knolls among the till swells. The 

 gravel knolls are especially frequent where the moraine crosses valleys, 

 being present in nearly every good-sized valley within the morainic belt, 



