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 Hogg'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 Trie, in the banks of the Scioto, or in some of its tribu- 

 taries. The bank? of Mill Creek at Rellepoint, and also for a couple of 

 miles above, are almost equally favorable. 



The next member of the Lower Corniferous is that described 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 nest 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 

 injure 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 a very firm and useful stone 

 for all uses in walls and foundations. The quarry of Mrs. Evans, about 

 a fourth of a mile below Millville, is in this stone. 



It is to the "Delhi stone," however, that the county is indebted for 

 the greatest quantity of quicklime. These beds lie 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 light, 

 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 lime- 

 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 



