178 GLACIAL FORMATIONS OF ERIE AND OHIO BASINS. 



each a small strip between the two tributaries just mentioned. The lower 

 courses of these tributaries have been filled to some extent with silt and 

 slack-water material, as a result of the filling of the Scioto Vallej^ with 

 glacial graA'^el. 



BEAVER CREEK. 



There are two important eastern tributaries of the Scioto entering 

 south of the glacial boundary, Beaver Creek and Salt Creek. Beaver Creek 

 is very small, li)ut is of importance, as it occupies the broad channel of the 

 old Kanawha from near Grlade westward to the vicinity of Pikeville (see 

 fig. 3, p. 101). It leaves the old valley near Pikeville and cuts across a 

 rock jjoint on its south border, passing into the Scioto below, while the old 

 valley connects with the Scioto at Waverly, 3 miles above Pikeville. The 

 silt filling in the old valley has perhaps been sufficient to cause this deflection 

 of the present drainage. 



SALT CREEK. 



Salt Creek embraces a widely branching drainage system, with an area 

 of about 500 square miles, which connects with the Scioto near the glacial 

 boundary, a short distance below Chillicothe. There are really three drain- 

 age basins, which become united at the east border of the Scioto Valley and 

 have a common line of discharge across the Scioto bottoms into the river. 

 These are known as North Fork, Middle Fork, and South Fork of Salt 

 Creek. North Fork drains the southwestern third of Hocking County and 

 adjacent portions of Faii-field, Pickaway, Ross, and Vinton counties, its line 

 of discharge being southeastward from Fairfield County across the eastern 

 edge of Pickaway into Hocking County, and thence west of south across 

 western Vinton and eastern Ross County. Middle Fork drains a much 

 smaller area, lying in western Vinton and northern Jackson counties. South 

 Fork drains about half of Jackson County northwestward through south- 

 eastern Ross County, and includes a few square miles of eastern Pike County. 



That the North Fork of Salt Creek has been greatly enlarged by 

 headwater accessions is so evident that several residents of the region who 

 have no knowledge of geology have made a clear interpretation of the 

 changes of drainage. They have noted a troughlike depression leading from 

 near the head of the North Fork, in Pickawa}^ County, westward up Plum 

 Run, and thence onward across a marshy divide to Scipio Creek, and down 

 that creek to the Scioto. This depression is a mile or more in width, and 



