V. 

 A PREGLACIAL VALLEY IN FAIRFIELD COUNTY. 



By W. G. Tight. 

 [Read Be/ore the Ohio State Academy of Science, Dec, 26 and 2J, iSgi)-] 



My attention was first called by Dr. J. C Hartzler of Newark to 

 the existence of a preglacial drainage line east of Lancaster, in Fair- 

 field county. In company with Dr. Hartzler and Prof. Richards, of 

 the Newark High School; I visited the region in the Spring of 1896 

 and together we traced a portion of the old valley. A more extended 

 examination of the region was made in the Fall in company with Mr. 

 C. A. Wiltsee, of the department of Geology of Denison University. 



The area under consideration and shown on the accompanying 

 map, Plate IV, includes principally Berne and Rush Creek townships 

 of Fairfield county, and Marion township of Hocking county, and 

 Jackson and Pike townships of Perry county. These townships are 

 now drained by the Hocking river and its tributary. Rush creek. The 

 river passes diagonally through Berne township, from Lancaster to Su- 

 gar Grove. A little below Lancaster it receives a small tributary, 

 Pleasant run, and at Sugar Grove the considerable stream of Rush 

 creek. Pleasant run rises on the drift plain of Pleasant township and 

 flows south into Berne township. In the southern part of Pleasant 

 township its valley is quite deep and of considerable size. On enter- 

 ing Berne township the stream flows out upon a broad, almost level 

 alluvial plain. The stream bears to the westward across this plain for 

 about two miles when it again enters a comparatively narrow valley 

 bounded by high hills, which it follows southward to the Hocking. 



Rush creek rises in the vicinity of New Lexington, Pike township, 

 Perry county, at about 871 feet A. T. , flows east to Bremen, thence 

 south into Hocking county a short distance and then turns east again 

 into Fairfield county. At Bremen it receives a considerable tributary. 

 North Fork Rush creek, from the north. This branch rises on the 

 drift till plain near Hadley Junction and Pleasantville and flows 



