308 GLACIAL FORMATIONS OF ERIE AND OHIO BASINS. 



reet above tide. 



Mount Carmel, Ind., about li 020 



Summit on Brookville and Connersville Pike, near toUgate, 4 miles from Brookville 



(barometric) -- 1> 050 



Alguina, about - - - - - 1> 025 



Whitewater Vallej' at Connersville - - - - 850 



Harveys station (in valley of Martindale Fork) - 958 



Morainic hills east of Harveys - - - 1> 065 



Highlands of northern AVayne and southern Randolph counties ■- 1, 200-1, 250 



Tlie range in altitude between Mill Creek Valley and the highlands of 

 Logan County is, therefore, nearly 1,000 feet. Tlie range in the altitude 

 of the rock surface slightly exceeds 1,000 feet, the altitude being less than 

 400 feet in Mill Creek Valley, and fully 1,400 feet in Logan County, near 

 Bellefontaine. 



TOPOGRAPHY. 



The moraine has, as a rule, a gently ruidulating surface, but as its 

 features vary from place to place a detailed description will be given, 

 beginning in southern Logan County, Ohio, where moraines of early 

 Wisconsin age first come into view outside the later ones, the moraine is 

 carried thence south and west 



Sharp ridges with north-south trend, separated by narrow gravel 

 plains, appear in southern Logan and northern Champaign counties. There 

 are two of these ridges in southern Logan County, and a third one sets in 

 in northern Champaign County, which at its northern end lies west of the 

 others, but which, owing to the disappearance of the other ridges, becomes 

 within 2 to 3 miles to the south the outermost and main ridge. These 

 ridges are of variable height and stand 20 to 100 feet above the bordering 

 gravel plains. Farther south, in the vicinity of Kings Creek, the ridging 

 becomes less sharp and the moraine consists mainly of low knolls 10 to 25 

 feet high, though it includes occasional larger ones 50 to 75 feet in height. 

 From Kings Creek southward to Springfield it is spread out over a breadth 

 of about 3 miles, while north from that creek the united breadth of the 

 ridges would scarcely amount to 2 miles. With increase of breadth there 

 comes a softening of contour, and much of this portion of the moraine 

 consists of swells only 10 to 20 feet high, among which are numerous 

 shallow basins. Near the eastern border of the moraine, and apparently 

 connected with a gravel plain lying outside (east) of it, there are irregular 

 sags and depressions, formed perhaps iDy the escape of water from beneath 

 the ice sheet. In the midst of the gravel plain there are occasional drift 



