20 THE PREGLACIAL DRAINAGE OF OHIO. 



Passing southward the valley gradually broadens through 

 Morgan county and reaches its maximum width, in this sec- 

 tion, near Roxbury where it bends sharply to the north and be- 

 comes rapidly narrower and its walls more precipitous until at 

 the col near the sharp bend to the south (Figure 2, plate III,) the 

 valley is a narraw gorge. After passing the mouth of Meigs 

 Creek the valley broadens again to the mouth of Wolf Creek, 

 at Beverly, from which point it begins to narrow again on pass- 

 ing further down the stream, until it reaches a minimum at the 

 point marked col on the map, a short distance above Lowell 

 (Figure i, plate III). From Lowell onward to its mouth it in- 

 creases in size and width until at Marietta the valley is as large 

 as that of the Ohio itself. 



Throughout the course of the valley there are extensive 

 gravel terraces in the broad and open portions but these are en- 

 tirely absent in the narrow section above Meigs creek and but 

 ver)^ slightly show in the Lowell narrows. These terraces are 

 the gravel trains which head far up the Tuscarawas and Lick- 

 ing in the morainic belts of the glaciated area. 



CHARATCERS OF THE L-ITTLE MUSKIXGUM AND DUCK CREEK 



VALLEYS. 



1 hese valleys have not been studied as carefully as the others 

 and only their very general features are referred to. The val- 

 lav of the Little IMuskingum is rather narrow throughout its 

 entire length. It shows a marked tendency to broaden out at 

 the points where it receives its largest tributaries. It is cut 

 out of the floor of a broad basin-like valley of the old land 

 surface. One of its remarkable features is its close parallelism 

 to the Ohio through its entire length. A view from the divide 

 which separates the Little Muskingum from the Ohio, (Figure 

 3, plate II), shows at a glance that the old valley of the Little 

 Muskingum was very much larger and had reached a more ad- 

 vanced stage of planation than that of the stream which was 

 later occupied by the Ohio. A view looking northward from 

 this divide across the Little Muskingum country is in very strik- 

 ine contrast to one looking southward across the Ohio.' 



