278 GEOLOGY OF OHIO. 



Silurian. Similar beds are exposed on John Ferrier's land, next above 

 Mr. Vance's. They continue also through the farms of Andre Wiants, 

 Hosea Stockwell, Nelson Utley, and James Williamson, a mile and a half 

 'above Mr. Vance's, showing the same characters, and are somewhat used 

 for walling wells and for common foundations. Below Mr. Overturfs 

 section, Mr. Reason Criss owns a bluff of similar stone on the right bank 

 of the Walnut. Passing down the Walnut, from the mouth of the Per- 

 fect, lower beds of No. 6 of the section above given on Mr. Overturfs 

 land are visible, making in all six feet of beds varying from two to six 

 inches in thickness. Although these beds generally have that thickness, 

 this number also embraces wavy beds of not more than one-eighth to one- 

 half inch thick, which strike diagonally across the face of the bluff, 

 sometimes rising and falling, and running out in either direction, with 

 a tapering point, within twenty-five feet, the thickness of the slaty beds 

 not being altogether more than four inches. Thus the valuable beds are 

 cut up into lenticular pieces of differing thicknesses, and rendered easy 

 of quarrying. With the exception of these wavy beds, the whole of 

 Overturfs section might be embraced in one number, the beds repre- 

 sented by Nos. 1, 3, and 5 being like the above in No. 6, and very unre- 

 liable, and without extension horizontally. 



. Passing further down the creek, just before reaching widow Boyd's 

 quarry, the base of the foregoing section shows thicker beds of six to 

 fourteen inches, to the amount of about three feet ; but before reaching 

 the quarry they disappear in the bank, and no more is seen of them. 

 But at the quarry of Mrs. Boyd there is a high bank of about twenty 

 feet, embracing some of the rock of the foregoing section, and running 

 down so as to cover the foregoing thick beds. Here the thickest stone 

 taken out is fourteen inches, but no bed is constantly of that thickness. 

 Indeed, the whole of it, even in the bed of the creek where the quarrying 

 is done, appears thin-bedded, and it is difficult to say where the horizon 

 of the above thick beds really is. It is certain, however, that to complete 

 the downward section from Overturfs to this place it is necessary to add : 



No. 7. Beds heavier, sometimes 14 inches, with some slaty beds... 5 ft. 6 in. 



At Mrs. Boyd's quarry some fine stone for heavy bridge abutments is 

 being taken out (summer of 1872). It is of a fine grain, blue color, and 

 a thickness of about eight inches. When it comes from below the water, 

 sometimes the thinner slaty beds are compacted and adhere together, so 

 that the stone appears nearly all in beds of four to fourteen inches. 



Descending the creek still further, there occurs an interval of no ex- 

 posure, but from the dip of the beds where last seen, and from the char- 

 acter of the stone where next exposed, it is certain the creek has made 



