1894.] A Glacial Ice Dam. 493 
drift, the explanation would be more simple. As it is, there 
seems to be but one solution to the problem to suggest, and we 
believe the facts point very strongly toward its support. This 
region is just on the eastern border of the Scioto lobe of the ice 
sheet. No glacial till is reported south or east of this point in 
Ohio. Does it not seem reasonable then that the great ice 
front or a local spur of it extended to this point and presented 
a front along a line represented by the north bank of the river 
in the line of L, m, g, n, H, K, and F, and remained there long 
enough for the river waters deflected at X to strike this ice 
barrier at L m, and, deflected along its front, to cut through 
the narrow and jointed rocky spurs at KT, then at HS, and last 
atg œ. If this is true, it will serve asa point in evidence of the 
probability of ice dams and a point to fix a limit to the ice 
sheet itself. 
For fuller elaboration of the data of this region and other 
facts in evidence of the very near position of the ice front, see 
Bulletin of the Scientific Laboratories of Denison University, 
vou Vill, Pt. 2. 
