466 GEOLOGY OF OHIO. 



t 



No. 5 is a good ore, and worthy of some practical investigation. The 

 layer is thick enough to be worked under favorable circumstances, and 

 being near the Ohio River, it might be shipped to furnaces down the 

 river. The other ores are less rich in iron, and No. 4 has more phos- 

 phoric acid than ore should have. 



The probable place of the Hobson coal is below the heavy sandrock at 

 the base of the geological section, and not far from the level of the Ohio 

 River. It is probably too thin to be of any practical value. 



One-half mile above the mouth of Little Hocking the following section 



was taken: 



rt. In. 



1. Shale 9 



2. Sandstone 20 



3. Shale and laminated sandstone 12 



4. Blue shale, ferruginous 4 



5. Coal, Hobson's seam 1 2 



6. Not seen to Ohio River 20 0' 



(See Map XI., No. 12.) 



Near the mouth of Little Hocking Mr. M. R. Hill and Mr. Waterman 

 have opened the same seam of coal as that givan above, but have taken 

 out but little. The seam is quite too thin to make the mining profit- 

 able. 



There is another thin seam of coal higher in the hills, of which we 

 sometimes find traces, but it is of no practical worth. We sometimes 

 find in the Ohio River hills clay shales which contain considerable lime- 

 stone of valuable fertilizing quality. The limestone is in small concre- 

 tions, and is often sufficiently abundant to give the shale a whitish ap- 

 pearance. 



The Drift terraces along the Ohio constitute an interesting feature in 

 the surface geology of this township ; they are high and well defined, and 

 upon them are some fine earth- works of the old Mound-builders. 



Although Blennerhasset's Island belongs to West Virginia, yet, being 

 very near the Ohio shore, it may be properly alluded to. This island is 

 one of the most beautiful of the river islands, and is connected with 

 scenes in the early history of the General Government which make it of 

 no little historical interest. Mr. Wirt's speech at the trial of Mr. Blen- 

 nerhasset for complicity with the designs of Aaron Burr, which were 

 supposed to be treasonable, has become classic, and the island he so well 

 pictures is often visited by strangers. 



BARLOW TOWNSHIP. 



This township is north of Durham and west of Warren. The southern 

 part is drained by the branches of Little Hocking, and the north part by 

 the branches of Wolf' Creek; In the central and northern part the land 



