114 GLACIAL FORMATIONS OF ERIE AND OHIO BASINS. 



bend a gradation plain is preserved, and in places occupies about half the 

 width of the valley. Its altitude by aneroid is 640 to 650 feet above tide, 

 or nearly 200 feet above the stream. Its rock platform is capped with a few 

 feet of gravel and sand, among which are pebbles derived from the Lower 

 Carboniferous rocks that outcrop at the headwaters of the Licking. A 

 gradation plain of similar altitude above the river is reported b}^ the resi- 

 dents to be preserved at points farther up the valley. This gradation plain 

 stands 250 to 300 feet below the neighboring uplands in a valley much 

 narrower and more sharply outlined than that which carries the Tertiary 

 deposits. Its relation to the uplands and also to the present drainage is 

 similar to that of the gradation plain of the middle Ohio system, of which 

 it is the probable correlative. 



On the Kentucky River but one place was found on the lower 8 miles of 

 the valley which seems to represent, a gradation plain. This is a terrace 

 standing on the east side of the valley opposite Lock No. 1, aboiit 3 miles 

 from the Ohio. Its altitude is by aneroid 175 feet above the stream, or 

 scarcely 600 feet above tide. A northern tributary of the Ohio (Indiari- 

 Kentuck Creek), entering 4 miles below the mouth of the Kentucky River 

 has well-preserved remnants of a gradation plain near its mouth, standing 

 by aneroid 610 feet above tide. These seem to harmonize with the single 

 remnant found on the Kentucky and to support the view that it represents a 

 gradation plain. 



One of the most conspicuous remnants which this region affords of a 

 gradation plain on the immediate borders of the Ohio, and one which is 

 rather difficult to interpret, is that of an abandoned channel which leads 

 from Eagle Creek, now a tributary of the Kentucky River, northward to 

 the Ohio River. It leaves Eagle Creek 2 miles west of Glencoe, Ky., and 

 passes in a winding course to the Ohio Valley at the bend above Warsaw, 

 Ky. It stands fully 200 feet above the Ohio, and has a width of about 

 one-half mile. 



An abandoned cnannel with a gradation plain of a similar height and 

 width connects closely with this channel and continues northward, back of 

 a range of hills east of the Ohio, to the south fork of Big Bone Creek, a 

 stream which passes from there westward into the Ohio. This northward 

 continuation of the abandoned channel was at first thought by the writer to 

 indicate that the old course of drainage continued northward from the 



