SUS: GEOLOGY OF OHIO. 
color, and a grindstone grit. Thedipof the reck is5° north, and the quarry 
is twenty feet below an opening in the same rock at Plymouth village. 
The following illustration of the face of a broken rock of the lower strata, 
which at the time of my visit was lying in its natural bed, indicates the 
manner in which atmospheric agencics operating upon the cementing 
mineral of the rock change its color, and show how these may have pro- 
duced the remarkable and beautifully colored bands so conspicuous in the - 
quarry near Mansfield, and some other openings in the Center. 
The mass of the rock marked A A has the ordinary bluish color of much 
of the Berea. The parts marked B B Bare striped with black and yellow © 
in regular layers, the changes evidently tending to involve the whole, 
and progressing more rapidly at the point C on account of a seam in the 
rock which is permeable to water. 
This is the southern exposure in this neighborhood of unmistakable 
Berea, and there is great difficulty in tracing its connection with the 
outcrops of massive sandrock to the north-east, and in the central and 
eastern parts of the county. The surface rises to the north-east, is gently 
undulating, sometimes hilly, everywhere exhibiting a thick deposit of 
Drift, which conceals all the rocks, until a little north of Rome, in 
Blooming Grove township, on the banks of a small stream about fifteen 
feet of rocks are exposed, consisting of soft argillaceous shales, with hard 
blue tessellated bands which weather yellow, affording poor stone, but 
furnishing the only supply in this neighborhood. These present some- 
what the appearance of the Bedford shales belonging below the Berea, 
while topographically they are by the barometer one hundred and sev- 
enty feet above the Berea last described. In Weller township, one-half 
mile north-west of Olivesburgh, a well was sunk passing through twenty- © 
one feet of unstratified clay Drift, then striking a hard fine-grained blue | 
sandstone, underlain with alternate bands of sandstone and argillaceous 
shales. These were penetrated to the depth of nirteteen feet, when a 
small supply of water was obtained, and the explorations ceased. Four 
miles west, at Big Hill, the same sandstone is quarried. South of this 
and in the hills immediately north of Windsor station, in Weller town, 
