558 GEOLOGY OF OHIO. 



I 'did not learn that the coals seen in this section had been mined in 

 .this neighborhood. Farther east, in the cut at Glencoe Station, the lower 

 seam of coal in the preceding section is found to be four feet thick, and 

 twenty-eight feet above the bottom of the cut. The whole section at 

 this point is as follows : 



It. In 



1. Group of layers of cement limestone, seen in the last section. 



2. Sandy limestone . 4 



3. Shale 3 



4. Coal 4 



5. Clay and clay shale 16 



6. Sandy limestone 2 



7. Shale 3 



8. Cement limestone 5 



9. Sandy limestone, somewhat ferruginous 2 



Railroad track. (See Map XIV., No. 9.) 



A sample of the lowest cement limestone was obtained. The result of 

 Prof. Wormley's anlysis is as follows : 



Silicious matter 16.70 



Alumina, with trace of iron 2.90 



Lime, carbonate 58.00 



Magnesia, carbonate 21.60 



Total 99.20 



This lower cement limestone is approximately in the horizon of the Par- 

 ker's cement limestone of Barnesville, and is probably its equivalent. 



The fall of McMahon Creek from Glencoe east is such that it exposes 

 the Wheeling or Bellair seam of coal about a mile east of Glencoe. 

 Here the coal first appears in the bed of the stream. The section in the 

 bank of the creek is — 



It. In. 



1. Limestone, hard and sandy 5 



2. Shales, with nodules of limestone 12 



3. Coal 5 



4. Shale 3 



5. Coal 11 



6. Clay 1 2 



7. Coal 2 1 



8. Slate 1 



9. Coal, reported 3 o 



10. Fire-clay (not measured) 3 0? 



11. Dark blue limestone, seen 2 



Bed of McMahon Creek. 



