32 BULLETIN OF THE LABORATORIES 



cut between the mountains was bed rock shown in the channel. 

 The conclusion is inevitable that the considerable volume of water in 

 the creek above the gorge must find its way out through the gravel 

 filling in the bed of the gorge. The gorge of this fork of Brush creek 

 was examined at many points to the southward and everywhere was- 

 found a small percentage of northern pebbles. This would be expected 

 as the head waters are in the great till deposits of Beech Flats. 



An examination of the data obtained reveals the following rela- 

 tions. The Beech Flats is a large tract of level land lying at an ele- 

 vation of looo feet A. T, and 200 feet above Paint creek, occupy- 

 ing a portion of the southwest corner of Ross county, a portion of the 

 northwest corner of Pike county and a portion of the eastern edge of 

 Highland county. This land consists of a great deposit of till, show- 

 ing but a few slight marks of stratification, being in fact largely typical 

 boulder clay. It is bounded on all sides, except at its northern edge, 

 with high rock hills, capped with Waverly freestone which reach an 

 average elevation of 1200 feet A. T. At its northern edge, where it 

 borders the valley of Paint creek, is exhibited an average of 200 feet in 

 the thickness of the deposit. This thickness decreases towards the 

 south and southwest, due to a rise in the rock floor, while the top of 

 the deposit remains at nearly the same level. The elevation of this 

 surface is the same as that of the drift deposits on the north side of 

 Paint valley and also of those to the west in the vicinity of Barrett's 

 Mills and Carmel, both of which are beyond the ranges of hills enclosing 

 the Flats. The surface of the Flats is much cut up into drainage chan- 

 nels, so that the roads and pikes which traverse it in every direction 

 are by no means level, but on the other hand are quite hilly. These 

 channels in many cases seem to be out of proportion to the streams 

 that occupy them. The two principal ones being, the small stream that 

 rises near Cynthiana and flows west into Rocky Fork, the other and 

 larger being Baker's Fork of Brush creek, which also rises near Cyn- 

 thiana and flows south past Fort Hill and Shults' mountain. In both 

 cases the valleys these streams occupy in the drift seem too large to 

 be easily accounted for by present forces, especially in view of the 

 slight amount of change observed in the forms of the deposits next to 

 Paint valley. Both these streams pass out of the district through rock 

 gorges. The former at an elevation of 940 feet A. T. and the latter 885 

 feet A. T. In both cases also the gorges are now partially filled and the 

 streams are not flowing through the gorges on rock floors. The former 



