552 GEOLOGY OF OHIO. 



into the waters of Captina Creek. In the extreme north-east is McMahon 

 Creek, and in the north-west is a branch of Stillwater Creek. The tribu- 

 taries of Captina Creek do not have the rapid descent from the high 

 dividing land which characterizes the other streams, and hence no- 

 where, so far as I could learn, have they excavated their valleys deep 

 enough to reach the two principal Barnesville seams of coal, except in 

 the extreme southern part of the township, where the upper Barnesville 

 seam is mined. A section was taken in the deep railroad cut, section 28, 

 in which was found a seam of coal two feet thick, which was believed to 

 be the equivalent of the highest seam at Barnesville, or the one forty 

 feet above the tunnel seam. The strata revealed in this interesting cut 

 are as follows : 



Ft. In. 



1. Yellow shales, with strata of limestone, seen on knob above the 



cut on A. Millison's land 37 



Top of cut. 



2. White limestone (supposed thickness) 1 6 



3. Yellow shale 13 



4. Black shale 3 



5. Coal '. 5 



6. Shale, and thin layers of limestone 4 



7. Sandy and clay shale, top yellow, bottom dark 13 0. 



8. Coal 2 



9. Black sb ale and slate 6 



10. Coal 2 



11. Clay 1 



12. Black clay slate, with many thin layers of nodular siderite ore 12 



13. Blue clay, not laminated 4 



14. Sandstone 4 



Railroad track, two feet above the bottom of the sandrock. 

 (Map XIV., No. 3.) 



The hill above the cut is the highest in this part of the county. 



In a railroad cut about one-fourth of a mile east of the deep cut last 

 mentioned, we find the same two-feet seam of coal. The section is as 

 follows : 



M. In. 



1. Shaly sandstone, with black shale below (not measured). 



2. Coal 2 



3. Underclay 1 6 



4. . Black clay shale, with nodules of siderite ore in layers 12 



5. Sandrock, with blue, sandy clay, very irregularly bedded 10 



Level of railroad track. 



There are probably eight feet of dip of the strata between the last cut 

 and this. 

 In the next railroad cut, about a quarter of a mile further east, we 



