387 
or even silt, are interstratified with layers containing the coarsest ma- 
terials. 
The best, probably the only, interpretation of the observed facts is, that 
this is a great alluvial cone built in or at the edge of the retreating ice sheet 
when its edge lay at the prominent Independence-Darlington Moraine, in 
the range of which this feature stands, although no other of its strong 
elevations appear in the immediately surrounding landscape, and not 
within two or three miles. 
This great pile, for it is really quite impressive, represents the deposit 
of a stream of considerable volume flowing off or out of the ice at the 
time when the height or depth of the ice at this southwestern edge must 
have been not less than one hundred (100) and possibly several hundred 
feet. This stream flowed in a channel deep enough to confine it for a 
long time to this particular place. Possibly the channel was a deep canyon 
in the ice or a tunnel under it. As it heaped up the material at one point 
its course was diverted and a new direction of flow and construction was 
begun in true cone or delta building fashion. 
An interesting question arises as to a possible relation between this 
hill and the gigantic South Raub Esker lying a few miles to the east 
northeast. The trend of this Hsker is directly toward Shawnee Mound 
and the direction of the esker stream was southwest, but there is a gap 
of nearly five (5) miles, a distance as great as the length of the esker 
itself, between the west end of the esker and the Shawnee Mound cone, 
and no sufficient intermediate correlating features have as yet been found. 
This discussion is presented to show the importance of detail work in 
interpreting the complex and little known phenomena of the great ice sheet. 
