280 GEOLOGY OF OHIO. 



Opposite the mill of Mr. McFarland, Mr. Landon owns another quarry, 

 situated a little further down. At this place the exposed section ig as 

 follows, continuing the numbering from above : 



No. 11. As above IS it. 



12. Shale, as above 4 " 6 in - 



13. Heavy sandstone, in one bed, sometimes concretionary. 2 " 



14. Shale ■ x " 



15. In one bed, sandstone 1 " 10 



16. Shale in the bed of the creek, thickness unknown. 



Total thickness of section 76 " 8 



The shale of No. 12 is. apt to contain thin but very even beds of good 

 sandstone. Indeed, one heavy bed of sandstone, valuable for railroad 

 bridges, and for that purpose here quarried, entirely embraced in this 

 shale, gradually thins out horizontally toward the north, and disappears 

 entirely in the distance of 22 feet. This is a valuable quarry and furn- 

 ishes heavy stone. The same is true of Sprague and Burr's quarry, 

 which is across the creek and near the mill of Mr. McFarland. It is in 

 the beds of No. 11 of the foregoing section. 



Passing down the creek to the mouth of the Rattlesnake Creek, no 

 further view of the shale underlying the sandstone is obtained. The 

 bluffs are bold and rocky on either side, large fallen masses lying at the 

 base, breaking the force of freshet currents and concealing the shale 

 from sight. 



The foregoing section of the lower portion of the sandstone, Nos. 1 to 

 16 inclusive, includes the Berea grit. It shows the imperceptible change 

 that takes place between the Cuyahoga and the Berea. There seems 

 to be no marked horizon setting off one from the other, yet there is a 

 lithological difference that mainly consists in the heavier beds and the 

 coarser grain of the Berea. The mica specks are also wanting generally 

 in the Berea, although it is probable they would be found in the inclosed 

 shale. The Berea may be said to include Nos. 8, 9, 10, 11, 13, and 15 ; the 

 Cuyahoga would embrace Nos. 1, 2, 3, 4, 5, 6, and 7. The underlying 

 shale is represented within the sandstone layers of the base of the Berea 

 grit by Nos. 12 and 14 ; showing a gradual transition, so far as this sec- 

 tion is concerned, from shale to coarse-grained sandstone, and then to 

 the fine and shaly beds of the Cuyahoga. The very rough and fragment- 

 ary condition of Nos 8 and 10 should be specially noted. It occurs within 

 the Berea, and has not been seen elsewhere in that formation. 



Berea Grit. — Besides the foregoing sections in the Berea grit, it is also 

 quarried by Mr. John Knox, in the banks of the Rattlesnake Creek, 



