328 GEOLOGY OF OHIO. 
A section across the stream from Mt. Vernon west, gives a much broad- 
er alluvial plain, a similar succession of terraces rising gradually to land 
covered with unmodified clay Drift, containing striated boulders. 
The hills east of Mt. Vernon are generally covered with Drift contain- 
ing abundant debris of Waverly, and many granitic boulders. Patches 
of typical clay Drift are most abundant on the slopes near the top of the 
hills, and in places exposed ten feet thick. 
Following the Columbus road westward toward Mt. Liberty, the sur- 
face rises very slowly from the river over a bed of fine gravelly and sandy 
alluvium, filled with small bowlders, many of them of limestone, then 
striking irregular drift-hills which reach an elevation one hundred and 
fifty-five feet above the railroad at Mt. Vernon. The material of these 
hills is coarse, consisting chiefly of gravel and sand, with flat fragments 
from the Waverly, and a few large granitic bowlders. The surface is 
irregular and billowy, as if piled up by the action of shore waves when 
the water stood at this elevation. Thence to Mt. Liberty the surface 
rises to the height of two hundred and twenty-five feet above the rail- 
road, the wagon road passing over undulating Drift hills, the materials 
steadily becoming coarser, containing more limestone, and more flat 
fragments of rock. The underlying strata are entirely covered by this 
deposit. Wells on the hills at Mt. Liberty show, 
FEET. 
Be (Gravel ese ce eee eee ee oS Ste fcr Liat 2 Rapin Ry tM ege a ecuere C Dates & 15 
2: - Blueiclay ewe ace o eeepc oe re eye ars ones minaret eee eyatataiane sets 5 to 15 
when quicksand, resting upon shelly sandstone, is reached, and affords 
an abundant supply of water. 
West of Mt. Liberty a cut on the railroad at an elevation of two hun- 
dred and eighty-five feet above the depot at Mt. Vernon shows that the 
Drift is wholly unstratified. It contains a large percentage of small 
limestone bowlders. Many of these are striated, but none of them rolled 
or water-worn. Finely broken, irregular fragments are abundant, and a 
moderate quantity of flat and broken pigments of the Waverly are seen. 
This is typical unmodified glacial Drift, and ‘this deep gorge was filled 
with it to the height of at least two hundred and eighty-five feet above 
the present bed of the stream. Similar deposits yet remaining in pro- 
tected places on the level of the stream show what was the original 
material which filled the valley. 
In Hilliar township the hills are composed of tenacious clay Drift, the 
wells showing eight to eighteen feet of yellow clay, then blue clay pass- 
ing into hard-pan on the hills and resting on quicksand in the valleys. 
On the bottom lands of the stream we find— 
