286 GLACIAL FORMATIONS OF ERIE AND OHIO BASINS. 



terrace appears, which seems to be much older than the Wisconsin terrace. 

 It stands about 70 feet, while the Wisconsin terrace in that part of the 

 valley rises scarcely 40 feet above Sandy Creek. It is preserved only in 

 a recess on the south side of the valley, and there has a much more eroded 

 surface than the Wisconsin terrace. It contains a sandy gravel which shows 

 a greater degree of weathering than the Wisconsin gravel, and it has been 

 opened extensively by the railway company to obtain gravel for ballast. 

 The entire deposit is deeply weathered and many of the stones are very 

 rotten. A few granite and quartzite pebbles, 3 inches or less in diameter, 

 were found after prolonged search, but there is a much smaller percentage 

 of such rocks than in the gravels of Wisconsin age found on the lower 

 tei'race along the creek. 



The valley was examined below Waynesburg as far as Sandyville, but 

 no other remnants of the old gravel were observed. 



The occuiTcnce of this old gravel suggests that the border of the 

 lUinoian drift sheet may lie not far back to the north; but, as indicated in 

 the discussion of that drift, no exposures have been noted outside the 

 Wisconsin drift in that part of Ohio. 



TUSCARAWAS AND TRIBUTARIES. 



No Other remnants of such old graA^el have been observed on the 

 Tuscarawas or its tributaries, though the valleys have received only a 

 hasty examination, and some of them have received no attention. The 

 same is true of the valley of Killbuck Creek, a tributary of Walhonding 

 River. The Walhonding emerges from the old or lUinoian drift a few miles 

 above its mouth, but examinations have not been carried down the valley 

 sufficiently to determine whether there was a notable outwash. Waha- 

 tomaka Creek also emerges from the old drift some distance above its 

 mouth, but the portion outside the drift border lias received no attention. 

 We accordingly pass to the next valley to the west. Licking River, and 

 consider its outwash and that of its continuation, Muskingum River. 



LICKING-MUSKINGUM VALLEY. 



As noted in the discussion of the drift border, a g-reat dam was built 

 across the old westward line of discharge of the Muskingum, at Hanover, 

 Ohio, which stands about 100 feet above the portions of the valley on each 

 side, and perhaps 300 feet above the rock floor of the old valley. While 



