THE NIAGARAN FORMATIONS OF WESTERN OHIO 353 



The upper Niagaran dolomites were formerly extensively 

 quarried in Covington, but in recent years they have not been 

 worked to any extent. Just south of the town is the J. W. Ruhl 



Fig. 1. — Eastern wall of the Jackson Stone Co. quarry, two miles south of Cov- 

 ington, Ohio. The lower part is the Laurel limestone. Mr. Cottingham's foot is 

 on top of the "mottled zone," above which is all of the Springfield dolomite, while 

 the top of the wall is the base of the Cedarville dolomite. 



quarry, the long wall of which is visible from the traction cars to 

 the west of the track. The following section of the eastern wall, 

 near its upper end and a short distance south of Bridge Street, was 

 made: 



