172 GLACIAL FORMATIONS OF ERIE AND OHIO BASINS. 



either the old north-flowing Hocking or the lower course of Kush Creek. 

 Each is about as broad as the valley of Rush Creek above the point of sepa- 

 ration from the latter, being nearly one-half mile in width, but they are 

 decidedly narrower than the Hocking Valley. They seem too broad to have 

 been excavated by an interglacial stream, and it appears more probable that 

 the double channel is a preglacial feature. 



A slight change in one of the eastern tributaries of Rush Creek, between 

 the point where it leaves the old valley near Bremen and the old divide, 

 should be mentioned. This tributary enters Rush Creek within a mile 

 inside the glacial boundary, yet its lower course was so greatly obstructed 

 by drift deposits that it has cut a new channel across a rock point south of 

 the old channel. 



The North Fork of Rush Creek enters the main creek through a rock 

 gorge between Rushville and Bremen. The headwater portion apparently 

 discharged westward near the line of the Ohio Central Railway, leaving the 

 present valley about 2 miles above Rushville. The course is so greatly 

 concealed by accumulations of drift that it can be only approximately 

 determined. 



RACCOON CREEK. 



Passing over a few small northern tributaries of the Ohio below the 

 mouth of Hocking River we come to the valley of Raccoon Creek. The 

 sources of this creek are in westei-n Athens and southern Hocking counties, on 

 the immediate border of the Hocking Valley. One branch heads near the line 

 of Athens and Hocking County within 1^ miles of the Hocking River and 

 branches farther west are but 4 to 6 miles back from the river. The divide at 

 the head of these tributaries is a prominent sandstone ridge with an elevation 

 200 to 300 feet above the Hocking Valley or 900 to 1,000 feet above tide. 

 The heads of these tributaries are in valleys 100 to 200 feet below the crest 

 of the dividing ridge, or about 800 feet above tide. In the middle part of 

 this drainage basin there are remarkable variations in the valley contours, 

 the streams being partly in low lands which have the appearance of being 

 old lines of drainage, and partly in narrow valleys, with abrupt bluff's, which 

 have the appearance of being newly opened channels. The writer did not 

 give these features sufficient attention to warrant an interpretation. They 

 are, however, under investigation by Tight. 



