100 MAN AND THE GLACIAL PERIOD. 



and Lake Michigan, and sweeping around in a curve to the 

 right, passing south of Madison and northward along the 

 line of Wisconsin River, and in another curve to the left, 

 around the southern end of Lake Michigan, as the " ter- 

 minal moraine of the second Glacial epoch." In Wiscon- 

 sin the character of this line of moraine hills had been 

 discovered and described by Colonel Charles Whittlesey, in 

 1866. It was first named the " kettle-moraine," because 

 of the frequent occurrence in it of " kettle-holes." This 

 line of moraine hills has been traced with a great degree 

 of confidence across the entire glaciated area, as shown 

 upon our map, but it is not everywhere equally distinct, 

 and, as will be observed, follows a very irregular course. 



Beginning in Ohio we find it coinciding nearly with 

 the extreme glacial boundary until it reaches the valley of 

 the Scioto River, on the sixth meridian west from Wash- 

 ington, where it begins to bear northward and continues 

 in that direction for a distance of sixty or seventy miles, 

 and then turns southward again in the valley of the 

 Miami, having formed between these two valleys a sort of 

 medial moraine.* A similar medial moraine had also been 

 noted by President Chamberlin between the valleys of the 

 Grand and Cuyahoga Rivers, in the eastern part of Ohio. 

 Indeed, for the whole distance across Ohio and Indiana, 

 this moraine occurs in a series of loops pointing to the 

 south, corresponding in general to the five gentle valleys 

 which mark the territory, namely, those of the Grand and 

 Mahoning Rivers ; the Sandusky and Scioto Rivers ; the 

 Great Miami River ; the White River ; and the Maumee 

 and Wabash Rivers. Everywhere, however, over this area 

 these morainic accumulations approximate pretty closely 

 to the extreme boundary of the glaciated region. 



In Illinois President Chamberlin's original determina- 

 tion of the moraine fixed it near the southern end of Lake 



* See map at the beginning of the chapter. 



