OF DENISON UNIVERSITY. 



5? 



Does it not seem reasonable then to believe 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 at 

 g c? If this is true it will serve as a point in evidence of the 

 probability of ice dams and a point to fix a limit to the ice sheet 

 itself 



After passing this gorge the Licking waters found a lower 

 channel along their present course than through the canal gap 

 to the Muskingum at Dresden. 



8. Relation of the Preglacial Muskingum Drainage to 

 THE Other Drainage Systems of the State. 



The recent article by Prof T. C. Chamberlin and F. Lev- 

 erett on "Drainage Features of the Upper Ohio Basin." Art. 

 XXIV in the April issue of "The American Journal of Science," 

 presents many facts which have a much wider application than 

 the immediate territory considered. If the conclusions reached 

 in that paper are in the main correct and accumulating evidence 

 seems to point with certain finger in that direction, the question 

 naturally arises : What of the lower Ohio river basin ? 



If the waters of the Allegheny and Monongahela, with 

 their tributaries should be subtracted from those of the present 

 Ohio the latter would be reduced to about half its present volume. 

 The stream would then be small in comparison with the size of 

 its gorge. 



The principal tributaries along the Ohio State boundary, 

 which we will designate as the middle Ohio basin would then be 

 the Muskingum, Hocking, Scioto and Miami on the north and 

 and the Kanawha, Big Sandy, and Licking (Kentucky) on the 

 south. These streams represent a hydrographic basin but a 

 little larger than that of the upper basin. If the influence of 



