OUTER MORAINE OF THE MIAMI LOBE. 307 



RELIEF. 



The highest points along the crest attain an altitude of perhaps 50 feet, 

 while the sags and lower parts of the moraine stand but 10 to 20 feet aljove 

 the outer border district. The average relief is estimated to be about 30 

 feet. On the inner border it is even less, there being a sheet of drift con- 

 nected with the moraine which reduces its relief on that border to but 10 to 

 20 feet. 



RANGE IN ALTITUDE. 



The range in altitude depends largely upon the differences in the level 

 of the underlying surface. The effect of the drift accumulation has been to 

 reduce rather than to increase the inequalities of surface, many of the pre- 

 glacial valleys being deeply filled with drift while the neighboring ridges 

 are thinly coated by it. For example: In Mill Creek Valley, at Lockland, 

 where the moraine has almost its lowest altitude, the entire drift, older and 

 newer, has a depth of about 180 feet below the level of the creek; but on 

 the upland ridges its depth is seldom over 50 feet and often is so slight that 

 shallow wells and cisterns reach the rock. However, in Fayette, Wayne, 

 and Randolph counties, Indiana, there is (including the earlier or Illinoian 

 drift) 100 feet or more of drift on the uplands. 



The following table indicates approximately the range in altitude, though 

 jDOSsibly portions of the uplands contain higher jDoints than appear in the 

 table. It includes altitudes along ridges in the reentrants between the 

 lobes: 



Altitudes along the oute>' moraine of the Miami lohe. 



Feet above tide. 



Highlands in Logan County, Ohio .1, 200-1, 500 



Near West Liberty, on uplands 1, 200-1 , 300 



Near "West Liberty, in Mad River Valley 1, 100 



East of Urbana, on uplands 1, 050-1, 100 



Springfield, on moraine, near Standpipe, about 1, 075 



West of Yellowsprings - 1, 000-1, 025 



West of Xenia 940-975 



In Spring Valley - - - - - 760-825 



East of Waynesville 875-900 



South of Lebanon 87.5-900 



Northwest of Deerfield, in Turtle Creek Valley 675-725 



Miltomson and vicinity 900-925 



Pisgah (highest point in village) about 960 



Mill Creek Valley, between Sharonville and Hartwell 570-600 



Between Mill Creek and Great Miami River, about 750 



Lowland tract southwest of Venice, about 600 



