76 PLEISTOCENE OF INDIANA AND MICHIGAN. 



southern Clay County. In southeastern Indiana the only notable accumulations are on the 

 east side of East White River, in Jackson County. 



In some of the valleys sand flats are still exposed to wind action and mild drifting is still 

 going on. In other valleys the bottoms are coated with a mucky clay and no sand is within 

 reach of the wind. This muck is a marked feature in the great bend of Eel River and occurs 

 to some extent along White River below the mouth of Eel River. The change from sandy to 

 mucky bottoms may find its explanation in a change from glacial to modern conditions. At the 

 culmination of the latest stage of glaciation Eel River received drainage from the ice sheet and 

 no doubt carried sandy material down its valley. But later this connection was cut off; 

 vegetation and soils came in, and now the river carries only mud, with which it has built up or 

 aggraded the valley bottoms several feet. The sand deposits, on this interpretation, consist 

 largely of the Wisconsin outwash that the wind has carried up over the bordering loess- 

 covered tracts. 



