HOCKING DRAINAGE BASIN. 171 



in its pi-esent course south of Bremen was not determined. Tight examined 

 this drainage basin in 1896 and located the old divide about 6 miles below 

 Bremen. He also independently reached the conclusion that the stream 

 formerly discharged westward from Bremen to Lancaster through the par- 

 tially filled valley noted hj the writer. This change of drainage has been 

 discussed quite fully by Tight, and his description is accompanied by 

 photographs of the abandoned valley and of the old divide.^ Through 

 a misinterpretation of the ma^DS of that region, he has placed the old 

 divide at the line of Fairfield and Hocking counties. Its position is really 2 

 miles below the county line, in section 10, Marion Township, Hocking 

 County, where the photograph of the old divide was taken which appears in 

 the paper refen-ed to. At this old divide a ledge of rocks extends out fully 

 halfway across the valley, reducing the width of the channel to scarcely 

 200 yards. This remnant of the col probably stands nearly as high as the 

 old divide, and shows it to have been scarcely 50 feet above the present 

 stream. The valley was filled with glacial deposits to a higher level than 

 this remnant of the divide, for it is coated with gravel to a depth of several 

 feet. The glacial boundary apparently follows somewhat closely the north 

 side of Rush Creek from this old divide westward to its mouth at Sugar 

 Grove. East from the old divide the drift border lies farther south than the 

 stream, except in the extreme headwaters east of Junction City. 



A peculiar change of drainage is found at Sugar Grove, near the mouth 

 of Rush Creek. There are two broad channels opening out from Rush 

 Creek Valley into the Hocking just above its mouth, which stand less than 

 50 feet above the stream, and yet are not utilized by the stream. Instead, 

 the creek has turned away from both of them and cut a narrow gorge 

 across a rock point on the east side of the valley. The point thus cut off 

 rises nearly 100 feet above the level of these broad valleys, but the stream 

 probably found a notch or depression back of it at a somewhat lower level. 

 It seems necessary to suppose that both of these broad valleys were at one 

 time filled sufficiently to cause the stream to select its present course. Yet 

 it is difficult to account for the removal of the obstruction unless, perchance, 

 the ice sheet was the obstruction. 



The occurrence of two broad channels is also a puzzling feature. 

 They do not appear to be in the natural position for an oxbow channel of 



'Bull. Denison Univ., Vol. IX, Pt. II, 1897, pp. 33-37, Pis. D, E, F, and IV. 



