512 



GLACIAL FORMATIONS OF ERIE AND OHIO BASINS. 



EANGE IN ALTITUDE. 



This moraine shows no abrupt changes in altitude, since it traverses a 

 nearly level country, but from the Wabash River, both to the north and to 

 the east, it has a gradual rise. In the former direction the rise ajDparently 

 continues into Michigan. In the latter direction the summit is reached near 

 the head of the Scioto River. The following table, showing the altitude of 

 railway stations and other points near the line of the crest of the moraine, 

 serves to indicate the amount and rate of change in altitude: 



Altitude along the Salamonie moraine. 



TOPOGRAPHY. 



Considerc.,ble variation in topography is displayed by this inorainic 

 belt, poi'tions of it being of the smooth ridge type with only gentle swells 

 and sags, while other portions carry knolls of the sharpest type and of 

 abrupt slope. The variations usually depend upon the structure, the por- 

 tion in which till predominates being of a smooth or gentle type, while 

 portions in which gravel or sand constitute the main material have sharp 

 or abrupt contours. 



