330 GEOLOGY OF OHIO. 
side of the railroad from Mt. Vernon to the south line of the county, 
marked by successive terrraces, and from one to three miles wide. It is 
bordered by hills of modified Drift, and forms an extension northward 
of the valley in which Owl Creek flows, until deflected to the east by 
Mt. Vernon. 
The following profile, reaching from Mt. Vernon to Martinsburg, 
omitting many of the less important hills and valleys, will show the 
character of the Drift deposits in this part of the county: 
PROFILE SECTION FROM MT. VERNON TO MARTINSBURG. 
The slope of the first hill, which rises to one hundred and seventy 
feet above Mt. Vernon, exhibits the olive shales of the Waverly covered 
by Waverly debris, with no evidences of Drift except occasional granite 
bowlders. On the top of this hill are found thin bowlder clay and granitic 
pebbles. Ascending the next slope to the height of three hundred and 
ten feet, the outcrop and debris ef the Waverly continues, with no Drift 
material until passing about twenty feet downward on the south-east 
side. There granite bowlders are found, and the slope below is covered 
with Drift mingled with angular fragments of the local rocks. The 
Drift continues to the top of the next hill, two hundred and eighty-five 
feet, but is thin, and the soil is composed mainly of local debris. One 
mile north of the last are broad expanses of gently undulating sandy 
fields, exhibiting no evidence of Drift except large scattered bowlders of 
granite, the soil like the banks of sandy streams. Rising above these 
sandy billows are irregular ridges of clay composed largely of foreign 
Drift. At the highest elevation—three hundred and five feet—the hill 
is capped with a heavy deposit of clay Drift. On the descending slope, 
at twenty feet from the top, a sandy water-washed surface is reached 
with granitic boulders scattered over it. Descending toward the eastern 
valley, the Drift on the slopes is deeper. On the last slope, at an eleva- 
tion of two hundred and seventy-five feet, the Drift disappears, and the 
crushed layers of the Waverly are covered only with their own debris. 
At two hundred and fifteen feet the river Drift of washed sand, gravel, 
and granitic boulders is reached, which passes into the alluvium of the 
valley, cut by Big Run at an elevation of one hundred and sixty-five feet 
above Mt. Vernon. Ascending the divide on the opposite side of the 
stream, the same series of materials is found in reverse order, viz. | 
