548 GEOLOGY OF OHIO. 



A general outline section was taken on a branch of Stillwater Creek, 

 east of the railroad station, which is approximately as follows : 



Ft. In. 



1. Coal blossom. 



2. Notexposed 30 



3. Coal blossom. 



4. Notexposed 53 



5. Limestone 1 



6. Cement limestone, estimated 9 



7. Not seen 22 



8. Coal, upper Barnesville seam (not measured). 



9. Not seen 40 



10. Limestone 2 0? 



11. Cement limestone 5 0? 



12. Not seen ., 46 



13. Coal, lower Barnesville seam (not measured). 



(See Map XIV., No. 1.) 



The larger spaces in this, and in all the sections, were measured by an 

 aneroid barometer, and can be considered as only approximately accurate. 

 The weather, by its changes, always affects the instrument. It is also 

 often very difficult to make the exact corrections for dip. Mr. Nathan 

 Bundy first called my attention to the upper cement in the last section, 

 and made the suggestion that it might be the equivalent of the cement 

 limestone stratum at Warnock's Station, on the railroad. The verifica- 

 tion of this suggestion served as a key to unlock the stratigraphical puz- 

 zle of Belmont geology. 



The cement limestone last referred to, i. e., the one twenty-two feet 

 above the upper Barnesville seam of coal, was analyzed by Prof. Worm- 

 ley, with the following result : 



Silicious matter 17.78 



Alumina, with trace of iron 1.40 



Carbonate of lime 62.50 



Carbonate of magnesia 17.48 



Total 99.16 



The cement works of Messrs. T. C. Parker & Sons, in section 21, a 

 little north of Barnesville, use a cement limestone found between the 

 upper and lower Barnesville seams of coal. The stratum is five feet five 

 inches thick, and is apparently quite homogeneous. It is not mined in 

 open quarry, but by means of a drift-way. With the aid of Mr. Parker 



