310 GEOLOGY OF OHIO. 
county, and where once introduced into the markets of the county, par- 
ticularly in the western portions, it would draw custom from a wide 
range of country west and north, where no good cut-stone can be found. 
The little quarry of Rev. C. H. Perkins, in Radnor township, which 
furnished the stone placed in the abutments of the bridge over the 
Scioto near the mouth of Bogeg’s Creek, is the only opening in these 
beds within the county, and does not show the best qualities of the stone. 
Some of the most favorable points for quarries in this limestone are near 
the south county Ine, in the banks of the Scioto, or in some of its tribu- 
taries. The banks of Mill Creek at Bellepoint, and also for a couple of 
miles above, are alinost equally favorable. | 
The next member of the Lower Corniferous is that deseribed as thin- 
bedded, cherty, buff limestone, and differs but little from the last. Owing 
to the thinness of the bedding it is only useful for quicklime, of which 
it makes a quality very similar to the heavier beds below. 
The bluish limestone next overlying is not constant in its characters ; 
indeed, in some sections, covering the same horizon, it was found want- 
ing. In its place may sometimes be seen a few feet of very fossiliferous, 
bituminous limestone. The blue color'is believed to be due to the more 
even dissemination of bituminous matter through the entire rock, in- 
stead of its preservation in fossil forms. When the bitumen is present 
in considerable quantity, the black films and thin, irregular scales that 
disfigure and destroy the rock for building purposes, do not materially 
tmjure it for making quicklime. They readily volatilize in the kiln, but - 
the fresh lime is of a little darker color. When this member is not 
highly coralline and bituminous it makes awery firm and useful stone — 
for all uses in walls and foundations. The quarry of Mrs.. Evans, about 
a fourth of a mile below Millville, isin this stone. 
It is to the ‘“‘Delhi stone,” however, that the county is indebted for 
the greatest quantity of quicklime. These beds he immediately over 
the “‘bluish stone” last mentioned. The layers are generally not over 
three or four inches in thickness. They are rather hard and crystalline. 
They are often crinoidal and very fossiliferous. The color is rather hight, 
and the lime made is heavy and strong. It contains very little sediment 
that cannot slack, and brings the best price in the markets; yet it is 
not so white as that made from the Waterlime, nor is the stone so easily 
burned as the upper part of the Niagara limestone. In the absence of 
a better quality of stone for walls and common foundations, this hme- 
stone is very commonly employed, but the irregularity of its bedding 
and the thinness of its layers will effectually prevent its use in heavy 
stone-work. In deep quarrying the bedding would become thicker and 
