——— 
BUILDING STONE.) 639 
tion, and would scarcely be worked if the lime which can be made from 
them was not of good quality and demanded for construction in the 
neighborhood. 
There is quite a large number of quarries situated in the outcrops 
of Carboniferous limestone in southeastern Ohio, the products from 
which are used as fluxes and for burning, but the two quarries which 
have been mentioned in Muskingum county are the only ones which 
are of any consequence as producing materials of construction. The 
Carboniferous limestones of this area are hard to work and do not possess 
the highest requisites of a good building stone, but these quarries are 
capable at any time of producing material for building, and in fact do 
so, under special circumstances. Although these quarries are worthy of 
consideration in connection with their ability to produce building stones, 
still the industry is so insignificant that it has not been considered im- 
portant to tabulate the products of any of them. 
To recapitulate: The line drawn nearly through the center of the 
state from Erie county on the north through Adams county on the south 
will form the boundary between the area to the east, in which the chief 
quarrying industry is devoted to the extraction of sandstones, and the 
western area, in which the only quarrying industry is devoted to the 
extraction of limestones. 
The geological formations in the limestone area follow one another 
in a quite regular order, the oldest being situated in the southwestern 
corner, and the youngest in the eastern part of the state; and the 
character of the stone is entirely dependent upon this geological arrange- 
ment, as regards both the character and the quality of the material. 
A considerable quantity of stone is extracted from the Cincinnati 
group, but, as already indicated, this is chiefly owing to the circumstance 
that the material is in the neighborhood of the large city of Cincinnati. 
In quality the material is surpassed by the stone from other formations. 
A narrow band of Clinton limestone surrounds the area of the Cincin- 
nati group, but at the present time this formation furnishes no building 
stones. | : 
The Niagara or Cliff formation, which succeeds, is one of the great 
building-stone formations of the state, and in numerous places most 
excellent and durable materials are obtained ; but even the subdivisions 
of this group determine largely the character of the stones extracted. 
The lowest or the Dayton formation produces at all points a hard, com- 
