318 THE ILLINOIS GLACIAL LOBE. 



questionable whether the interval between their deposition was sufficiently 

 long to justify their reference to distinct glacial stages. The shifting of the 

 ice lobes, however, is thought to indicate a retreat of some consequence 

 between the two ice advances — a retreat probably much greater than took 

 place between the formation of neighboring moraines of the early Wis- 

 consin series. 



OUTLINE OF THE LATE WISCONSIN BORDER. 



So far as is yet known, the oldest moraine of the late Wisconsin series 

 is the Iroquois moraine of the coalesced Erie-Saginaw lobe. Full correla- 

 tions, however, have not been made of moraines of this series in the several 

 ice lobes. This moraine appears in northwestern Pulaski County, Indiana, 

 in the midst of the sand area known as "Old Lake Kankakee," and leads 

 southwestward along the divide between the Iroquois and Kankakee rivers, 

 across Jasper and Newton counties, Indiana, to eastern Iroquois County, 

 Illinois. It there swings abruptly southward, crossing the Iroquois River 

 between the State line and Watseka, Illinois, and soon curves to the 

 southeast, reentering Indiana in northwestern Benton County. It thence 

 passes southeastward across Benton and Warren counties, coming to the 

 Wabash Valley at Williamsport. Its further continuation to the southeast is 

 indicated approximately on the map accompanjdng Professor Chamberlin's 

 paper in the Third Annual Report. The moraine is discussed in detail in a 

 report now in preparation, which embraces the moraines of the Erie lobe. 



From the point where the Iroquois moraine turns southward in eastern 

 Iroquois County, Illinois, a bowldery belt leads northwestward past Ste. 

 Anne to the Kankakee River just above the city of Kankakee, being closely 

 associated with the Marseilles moraine to that point, but apparently distinct 

 from it at points farther north and west. This belt is discussed below as a 

 possible correlative of the Iroquois moraine. By this interpretation the 

 moraine occupying the divide between the Iroquois and Kankakee rivers in 

 Newton and Jasper counties, Indiana, is interlobate in character. This 

 interpretation would furnish an explanation for the abrupt eastern termina- 

 tion of the moraine, there being a coalescence of the lobes so complete in 

 the eastern part of the Kankakee Basin that no moraine was formed. 

 Unfortunately, the features are somewhat vague in the district northwest 

 from the point where the Iroquois moraine turns south and the interpretation 



