482 GEOLOGY OF OHIO. 



laboratory of the Manhattan gas works, New York, with favorable re- 

 sults as to the quantity of gas, and as to its high illuminating power. 

 A combined section of the strata seen on the upper part of Bear Creek 



is as follows : 



It. In. 



1. Blossom of coal 2 



2. Not exposed ; 2 



3. Limestone ; 2 



4. Not exposed 15 



5. Limestone 4 



6. Not exposed „ 60 



7. Sandstone '. 4 



8. Shale - 6 



9. Coal 3 



10. Slate parting « 1 



11. Coal 2 



12. Not exposed 27 



13. Sandstone 8 



14. Shale _ 6 



15. Laminated sandstone 10 



16. Shale ~ 2 



17. Limestone layers, white and buff 6 



(See Map XL, No. 22.) 



About forty feet above the upper coal, of which only a faint trace was 

 seen, is a stratum of blue limestone. 



The strata on Bear Creek dip regularly to the south. On the lower 

 part of the stream, before it leaves Salem township, we find in its bed a 

 well-known stratum of earthy, buff limestone, with which are associated 

 other limestone layers, forming a group which has quite an extensive 

 range in the eastern part of Washington county. Under this group lies 

 the lower Salem coal, found in many places on Duck Creek. On Whip- 

 ple's Run it is changed to cannel coal. Some of the limestones and the 

 associated shales are fossiliferous, containing, on Bear Creek, teeth of 

 fishes and comminuted shells. A layer of slate below the coal is also fos- 

 siliferous. This limestone group on Bear Creek, in the south-west corner 

 of Salem township, passes under the dividing ridge and is seen in the 

 bed of Duck Creek, near Mr. Flanders's, about half a mile above the 

 Cedar Narrows bridge, in Fearing township. From this point it is 

 readily traced in the banks of the creek and adjacent side hills up to 

 Salem, and up the East Fork to the Noble county line. The coal under 

 it is seldom more than three feet thick, and it is generally less. This 

 seam is the equivalent of the Pomeroy seam and of the Pittsburgh seam. 

 It has been traced from Pomeroy through Athens and Morgan counties 

 into Washington county. On the West Fork of Duck Creek the lime- 



