260 



GEOLOGY OF OHIO. 



The face of the stone where quarried by Mr. Brown presents some in- 

 dications of a fault of about four feet. A perpendicular seam cuts the 

 beds from the top to the bottom. An unusual accumulation of shale and 

 slaty layers on one side of this seam marks a horizon about midway in 

 the thin beds of the quarry (No. 2 of the above section), terminating 

 against the seam abruptly, with no continuation at that point. At a 

 point, however, about four feet lower, the same kind of shale and slaty 

 layers appear on the opposite side of the seam, and prolong the horizon 

 in that direction so far as the stone is exposed. 



The quarry of Mr. McLaren has five feet of thin beds and nine feet of 

 thick beds, embracing portions of Nos. 2 and 3 of Brown's quarry. Mr. 

 Sharrock's quarry is entirely in the flagging of No. 2 of Mr. Brown's, 

 exposed ten feet. Mr. Quay's is the same as Mr. Sharrock's. 



The quarries at Mt. Gilead are in the banks of the East Branch of the 

 Olentangy, or Whetstone Creek. Here there is a slight dip toward the 

 south south-east, and the following section can be made out, in descend- 

 ing order : 



Feet. Inches. 



No. 1. Drift, stratified in some places 15 



" 2. Berea grit, thin beds 10 



" o. Berea grit, thick beds 6 



" -1. Thin beds of sandstone, with shale 19 7 



" 5. Shale 22 1 



Total exposed 57 8 



Skctiox of the Bekea Gkit at Mt. Gilbad. 



Notes on the foregoing Section, — No. 1 has a brown color at the rock banks, 

 but a blue clay is met in town in wells, with a thickness of four to ten 

 feet in some traces, showing the usual characters of the hard-pan clay. 



No. 2. The thin beds of Berea grit seem to be constant, and immedi- 

 ately above the heavy beds. They have been seen in every place both 

 in Morrow and Crawford counties, where the heavy beds have been ex- 

 posed in quarrying. 



