2 Btilletin of Laboratories of Dcnison University [vc xu 



by referring to Plate I., which is a sketched map of the drain- ^ 

 age whose central outlines have just been indicated. Even a 

 casual study of this map can hardly fail to reveal peculiarities 

 in the drainage which it represents. Perhaps the first of these 

 to catch the eye is the fact that the North Fork of the Licking 

 receives no tributaries from the East, all the water that might 

 be expected to come into it from that direction flowing off by 

 way of the smaller and more tortuous Rocky Fork, which rises 

 almost in the valley of the North Fork. Again. Owl Creek 

 leads into a roundabout course some drainage that one might 

 reasonably suppose ought to come down into the North Fork. 

 This supposition is all the more rational when it is known that 

 the headwaters of both Owl Creek and the North Fork are in 

 the same preglacial valley. Another strange feature is the ir- 

 regularity of the Wakatomaka system. Although its axis 

 maintains a generally southeasterly direction, the main stream 

 itself is extremely tortuous and its tributaries preserve nothing 

 like normal parallelism. 



Having noted some of these pecularities it will not be out 

 of place next to outline briefly the map study which served as 

 a preliminary to the field study. The working hypotheses 

 with which we entered the field were based upon this map 

 study in connection with the work already done by Professor 

 Tight in adjacent regions to the South and Northwest. Indeed 

 it will readily be understood by those who have followed the in- 

 vestigation upon glacial stream-modification in Ohio that the 

 work in this region was undertaken with the idea of correlating 

 Changes found here with those already worked out in adjoining 



territory. . 



Some years ago, while engaged on his researches in the 

 neighborhood of Hanover and the Licking Gorge \ Professor 

 Tight had noticed a rather large preglacial valley tributary to 

 what he has called the Old Newark River. This old tributary 

 came seemingly from the Northeast and entered the main valley 

 at a point nearly opposite Hanover. But at present it brings 



> Tight, W. G., Bull. Sci. Lab. Den. Univ., 8 ' :35-63. 1^94- 



