530 GEOLOGY OF OHIO. 



branch of Wills Creek. A section was taken on the land of Horatio 

 Grummond, section 23, as follows : 



Ft. In. 



1. Shale 8 



2. Cannel coal, reported thickness : 1 6 



3. Not exposed 79 



4. Sandstone 3 



5. Shale and black slate, nodules of ore 6 



6. Coal, 3j feet seen, reported 6 



(See Map XII., No. 1.) 



The lower coal of this section was thought to be the equivalent of the 

 Cambridge seam, and the equivalent of the Alexander seam in Muskin- 

 gum county. The coal was formerly mined on the farm of Mr. Grummond, 

 but the old mine was not in a condition for complete measurement. The 

 cannel coal, eighty-eight feet above, is in the horizon of a thin seam of 

 coal seen at many points. • 



Near Cassell's Station, on the Central Ohio Railroad, section 22, the 

 following section was taken : 



Ft. In. 



1. Interval to top of hill not measured. 



2. Fossiliferous limestone 15 



3. Not seen 110 



4. Sandstone 6 



5. Dark shale, ferruginous 3 



6. Blackband iron ore 3 0- 



7. Coal (Cambridge seam) 3 6 



8. Not seen to level of railroad track 10 



(See Map XII., No. 15.) 



The following analysis of the blackband ore of the above section was 

 made by Prof. Wormley : 



Specific gravity 3.052 



Water and volatile matter 11.55 



Iron, carbonate 33.72 



Iron, sesquioxide 8.34 



Silicious matter 38.72 



Alumina 00.00 



Manganese 2.30 



Lime, carbonate 2.30 



Magnesia 2.49 



Sulphur 0.16 



Total 99.58 



Metallic iron 22.12 



Sulphur .' 0.16 



Phosphoric acid trace. 



