594 | GEOLOGY OF OHIO. 
This limestone occupies the horizon, and is doubtless the equivalent 
of that, which, when highly charged with iron, is in Tuscarawas county 
called the ‘“‘mountain ore.” The notable amount of iron it contains will 
perhaps make it valuable as a flux where too lean to be considered an ore. 
This report will be concluded with a general section of the rocks 
of the county. An examination will show that the different strata 
vary greatly in thickness and character. The local limestones tend 
to mislead the explorer, and it is possible that some of the distances 
given between the blue and gray limestones, are too small, as the local 
cannel coal limestone may in some instances have been mistaken 
for the blue. The lower four limestones are locally cherty, and in 
places constitute flint ridges. The one above the cannel coal is some- 
times separated from its coal by shales, and sometimes changes to a 
black limestone, and may be mistaken for the one directly below Coal 
No. 6. The coal below it is often bituminous, and sometimes wanting. 
The black limestone, in places, approaches very near to Coal No. 6, and 
becomes a drab limestone much like that below Coal No. 6, in Colum- 
biana county. 
