302 GEOLOGY OF OHIO. 
traced at different elevations, leaving in places four well-marked terraces 
respectively (commencing at bottom) of eight, twelve, and eighteen feet 
in height. 
A section across Wilkins Run, in Mary Ann township, shows water- 
washed sand hills rising in places to the height of one hundred feet — 
above the bottom of the stream. The wide valley and these elevated 
water-washed and assorted sand hills indicate the influence of water in 
quantity vastly in excess of any that could be derived from the local pre- 
cipitation. They are the result of the torrents which followed the melt- 
ing and retreat of the glaciers which brought down the Drift from the 
north. | 
The following sections of the material beneath the flood-plains and 
terraces near Newark, furnished me by W. M. Cunningham, Esq., con- | 
firms the above conclusions in regard to the extent of the erosion of the 
valleys and the foundation of a temporary lake basin at that point. 
BO SOT Sal VAT Se So eS ce SL NA AE pean eran ey ng ae tea 1to 2 
26 HY ellow clay.}with Coarsejenavieli ae arsenate ee easy eta ieee 1lto 6 
3. Ordinary sand and gravel, sometimes with quicksand. 
4. Blue clay, sometimes in pockets of 20 to 30 feet....--..--..---.---- 2 to 10 
5. Coarsesand and ora vel ac i cis ie sh a2 apni oars eye atts a ete nae 2to 4 
6. Blue clay. 
In sinking a well six miles west of Newark a piece of coniferous (?) 
wood was obtained at a depth of forty feet. 
GEOLOGICAL STRUCTURE. 
The geology of Licking county is largely a repetition of that of the 
counties lying immediately north of it, and the space given to the de- 
scription of the geological structure of those counties renders it unneces- 
sary to enter here into details which would be mere repetition of what 
_ has gone before. 
