356 GEOLOGY OF OHIO. 
exposed eight feet; dip east and west. In the latter the stone is of the 
same quality, but is less exposed. The quarry of the Pittsburgh, Fort 
Wayne and Chicago Railroad Company, near the village, shows about six 
feet of the same or similar beds. . 
North of Ada the Waterlime, in thin beds, is exposed along Hog Creek. 
It was also encountered in ditching for the outlet of the marsh. It is 
here made into quicklime by Samuel Coon. Near the county line quar- 
ries in Hog Creek are owned by Isham Kendall and John Trussell. The 
former burns quicklime. 
In Pleasant township the Waterlime may be seen in the Blanchard, at 
the “Camp Ground,” and in its tributaries in sections 6 and 7; also on 
the land of John Osborn and of Jacob Kirtz, S$. W. 4+ section 6. 
In Blanchard township, section 31, Michael Zigler, John Sargon, and 
Mrs. Hedrick have small openings in the same stone. 
Mr. Roland Park has a quarry in the thin blue beds of the Waterlime 
on the 8. H. 4 section 12, in Jackson township. Mr. Park’s quarry is 
believed to be in some of the lowest layers of the formation. The Niagara 
probably occupies the base of his section as exposed, but could not be 
certainly ascertained. 
The Lower Corniferous.—In the southern portion of the county, includ- 
ing portions of Taylor Creek and Hale townships, the area colored on the 
county map to represent the Corniferous limestone is so marked on the _ 
evidence of surface characters. These characters consist in a more roll” 
ing and gravelly surface, with occasional northern bowlders, and seem to 
extend northward from Logan county, where this formation has intro- 
duced, as in Sandusky and Seneca counties, already noted, a marked 
change in the general topography. 
The Drift.—The mass of the Drift in Hardin county is an unstratified 
glacial deposit. It is divided into the two usual colors: the brown, which 
forms the soil where it has not been covered with alluvial or paludine 
accumulations, and has a thickness of ten or twelve feet; and the blue, 
which has an unknown thickness, but in some cases is known to exceed 
fifty feet. South of the “dividing ridge,” which divides the county into 
nearly equal parts, the Drift contains much more assorted gravel and 
sand than it does north of the same ridge. Knolls and ridges, known as 
“hoe’s-backs” and “devil’s-backs,” are met with in Taylor Creek and 
Buck townships. The township of Roundhead and the southern part of 
McDonald afford abundance of gravel, which may be taken from many 
of the numerous knolls with which the country is diversified. The im- 
mediate surface of these knolls, as well as of the whole county, consists of 
the brown hard-pan, the stratified parts rarely rising to the top of the 
deposit. Yet the stratified parts of the Drift are nearer the surface south 
