THE CHAMPAIGN MORAINIC SYSTEM. 237 



Section of drift near Newport, Indiana. 



Feet. In. 



Bowlder clay, with pebbles of Silurian limestone and trap 30 



Yellow clay, with fragments of coal, shale, sandstone, etc i 



Bowlder clay, with pebbles of Silurian limestone 25 



Ferruginous sand Streak. 



Bowlder clay, from the northwest, with pebbles of various metamorphic rocks and trap, and 

 nuggets of native copper o0 



Total exposure - 105 4 



East of the Wabash, in Parke County, wells along- the outer or main 

 belt and on the plain north of it are seldom more than 30 feet in depth. 

 They pass through about 15 feet of yellow till, beneath which some of them 

 enter blue till, while others enter gravel. Thin beds of sand or gravel are 

 often found associated with the yellow as well as the blue till. 



Wells in western Montgomery County are in some cases sunk to a 

 depth of 50 or 75 feet, mainly through blue till. On the plain in Fountain 

 County, and also on the inner morainic ridge, wells seldom reach a depth 

 of 50 feet, and usually obtain Water without entering rock, there being beds 

 of water-bearing sand or gravel associated with the till sheet. 



CHARACTER OF OUTWASH. 



As a rule the plains outside the ridges of this morainic system show 

 scarcely any sand or gravel outwash from the moraine, and there appears 

 to have been only a gentle movement of waters from the ice margin south- 

 ward down the valleys. 



At the point where the Sangamon River emerges from the moraine in 

 the village of Mahomet there is a gravelly outwash having a depth of 6 or 7 

 feet, which caps the till plain on the immediate border of the valley. Expo- 

 sures are to be seen east of the railway station and also at several points in 

 the village. The exposures east of the railway station show a bed of loess- 

 like silt about 3 feet in thickness immediately below the gravel, and beneath 

 this a brownish-yellow till. The loess-like silt is similar to that which 

 covers the plains quite extensively in this region. The gravel overwash is 

 of very limited extent, reaching out scarcely a half mile from the south 

 border of the moraine. It merges into low gravelly knolls on the border 

 of the moraine. These features seem to leave no question of the gravel 

 being derived from the ice sheet during the formation of the moraine. 

 Attention has already been called to a gravelty tract along the Sangamon 



