"WASHINGTON COUNTY. 483 



stone group with the coal gradually thins, out to the north and disap- 

 pears—at least it was not seen in the vicinity of Caldwell, in Noble 

 county. 



■On Pawpaw Creek, a branch of the East Fork of Duck Creek, the lime- 

 stone group is seen for several miles. It is also seen on Coal Run, a 

 branch of Pawpaw, coming in from the north. The coal accompanying 

 this group has been mined in small quantities at several points, two or 

 three banks having been opened near the village of Salem. 



A section taken in the hill back of Salem village is as follows : 



Ft. In. 



1. Sandstone and shale g a 



2. Blue limestone q 



3. Buff limestone 2 



4. Limestone and shale _ 2 



5- Clay 3 



6: Coal , 2 6 



(See Map XL, No. 21.) 



On Pigeon Branch of Whipple's Run, on the Moses Blake farm, near 

 the south line of Salem township, the coal is for the most part cannel, 

 and has been mined to some extent and taken to Marietta. It burns 

 freely in the grate, but the percentage of ash is too great to make it a 

 desirable fuel. To the north this coal reverts to the usual type of bit- 

 uminous coal. Such changes are not uncommon, and show that cannel 

 coal is only a local modification of a seam of bituminous coal. A sample 

 of the bituminous coal of the " limestone seam," taken from the Coal 

 Run Branch of Pawpaw Creek, was analyzed by Prof. Wormley, with the 

 following result : 



Specific gravity (dried at 212°) ' 1.224 



Ash (light gray) 6.20 



Volatile matter 38.20 



Fixed carbon 55.60 



Total 100.00 



.Sulphur 2.18 



Coke very compact, with metallic luster. 



The buff limestone, which forms one of the layers of the limestone 

 group, was also analyzed, with a result as follows : 



Silicious matter 19.10 



Alumina and sesquioxide of iron 8.65 



Carbonate of lime 47.70 



Carbonate of magnesia 19.40 



Combined water 2.50 



Undetermined 2.65 



Total '. 100.00 



