414 THE ILLINOIS GLACIAL LOBE. 



Table of strict within limits of Shelbyville moraine — Continued. 



a Mr. Ossian Guthrie reports having observed stria? at Tho 

 pamphlet on the Lake Michigan Glaciers, map 3.) 



lton bearing more nearly westward. (See Guthri 



Considerable difficulty is experienced in assigning stria 3 in northwestern 

 Indiana to the proper ice lobe. That district was invaded from the north- 

 ward by the Illinois lobe and subsequently from the eastward by another 

 portion of the ice sheet, the Saginaw-Erie lobe, which in the closing stages 

 of glaciation became differentiated into the Saginaw lobe and the Erie or 

 Maumee lobe. Accordingly both southward and westward bearing stria? 

 are found. In some places, as at Monon and Kentland, a single rock sur- 

 face presents both southward and westward bearing striae, the westward 

 being the later. Usually, however, the stria; formed by the earlier ice 

 movement were either protected by drift deposits from the action of the 

 later ice movement, or they were so exposed as to be effaced by the later 

 movement, 



There are striae on the north bank of Eel River in the city of Logans- 

 port, concerning which the direction of movement is not certain. The 

 bearing is N. 14° W. or S. 14° E. Immediately north of Logansport lies 

 a heavy moraine formed on the north border of the Erie lobe, which, as 

 just noted, extended westward from the Lake Erie Basin. We may sup- 

 pose the striae to have been formed by a northward movement toward this 

 moraine, but it is quite as probable that they were formed by an earlier 

 southward movement, independent of the moraine and perhaps referable to 



