256 GEOLOGY OF OHIO. 



Coal Xo. 4 is known, locally, as the " limestone coal," though the gray- 

 limestone is rarely seen. • It is usually a cannel, of little value, and is not 

 mined. Many j^ears ago it was worked by stripping in section 8, on prop- 

 erty now belonging to Mr. Oscar Riney. It may be seen in a run, near 

 Johnson's Mill, where it seems to be about twenty inches thick. 



At Johnson's Mill, as well as at Otsego, the lower layer of the sandstone 

 over Coal No. 6 is, in the bottom two feet, a conglomerate of iron ore and 

 sandstone. The ore is apparently of average quality, but its association 

 with the sandstone is such as to render it worthless. It is referred to 

 here only because some might be led to expend money in exploring it. 

 Any money so. spent will be wasted. 



Highland Township. — On the Adamsville road from Norwich, Coal No. 

 76 is seen at several places, lying a few feet below the Crinoidal lime- 

 stone, but is nowhere worked, as its thickness seldom exceeds sixteen 

 inches. At Mr. Tait's, on this road, the Norwich coal is seen at the road- 

 side, and is mined near by, by stripping. As nearly as could be ascer- 

 tained, the thickness is two feet. The limestone is absent. About a mile 

 north, Mr. John Cherry works the same bed, and finds it from two and 

 one-half to three feet thick, with six inches of slaty coal. At both locali- 

 ties Coal No. 76 is seen, barely one foot thick. 



Along Limestone Ridge, which coincides with the Norwich anticlinal, 

 the Crinoidal limestone and the buff limestone, underlying the Norwich 

 coal, are frequently exposed, and the interval between them varies from 

 twenty to fifty feet. The latter disappears before reaching Bloomfield, 

 where the Crinoidal limestone appears in the Otsego road. Near that 

 village Mr. Oliver Rankin has an opening in the Norwich coal, which 

 gives the following section : 



FT. IN. 



1. Shale 3 5 



2. Coal I 9 



3. Clay 2 



4. Coal 8 



5. Fire-clay 6 



6. Limestone ' 8 



The coal is compact and hard, and meets with much favor. Black- 

 smiths use it, and pronounce it a very fair coal. Near the road from 

 Bloomfield to New Concord, the Norwich coal is worked on the old Murphy 

 farm. We there find : 



1. Sandstone q 



2. Dark shale 2 6 



3. Coal 2 9 



4. Fire-clay 



5. Limestone 7 



