36 ECONOMICAL GEOLOGY. 



and durable stone for massive buildings. The supply of both sand- 

 stone and limestone is practically inexhaustible. 



At Evansville, on the Okaw river, a fine quarry of excellent lime- 

 stone has been opened, and a large amount of rock for the abut- 

 ments of a suspension bridge has been taken out. The quarries are 

 located about half a mile back from the river, and a hundred feet 

 or more above low-water mark. The rock is a massive light-gray 

 semi-oolitic limestone, and is the highest bed outcropping in the 

 vicinity of the town. 



The principal quarry shows a perpendicular face of about 15 feet 

 of massive grayish-drab colored limestone, that closely resembles 

 some of the semi-oolitic beds of the St. Louis group. Some of the 

 beds attain a thickness of four or five feet, and will furnish dimen- 

 sion stone of any desirable size. 



No characteristic fossils were found in it, but it was underlaid by 

 nearly a hundred feet of shales and thin-bedded limestones, filled 

 with the characteristic fossils of the Chester group, leaving no 

 doubt in regard to the formation to which it belongs. It may, per. 

 haps, be the equivalent of the regularly-bedded portion of the upper 

 limestone in the Chester bluffs. The surface over which it forms 

 the bed rock is considerably broken by sink holes, similar to, but 

 smaller than those which prevail where the St. Louis limestone is 

 the underlying rock. Should a railroad be constructed through this 

 part of Kandolph county, these quarries would become a source of 

 profit to the owners, and would add an important item to the busi- 

 ness of the road. 



Rockville Quarries. Two miles and a half west of Seville, in Ful- 

 ton county, extensive quarries have been opened since the report 

 on that county was published, in a sandstone overlying No. 2, and 

 outcropping in the bluffs of a small stream running into Spoon 

 river. These quarries are owned by Robert F. Leenian, of Cincin- 

 nati, who has erected machinery for manufacturing grindstones, 

 whetstones, scythestones, and also for supplying dimension stone to 

 the Wabash road and the towns on its route. The rock in the 

 quarry shows a perpendicular face of about 20 feet, and furnishes 

 dimension stone from two to three feet in thickness, and as large 

 as can be conveniently handled. 



The best grindstone grit comes from near the middle of the bed, 

 and the stones manufactured here range from two to four feet or 

 more in diameter. The rock has a sharp grit, and seems to possess 

 an even texture that makes the stones desirable for ordinary use. 



