THE NIAGARAN FORMATIONS OF WESTERN OHIO 351 



Thickness tkck^ss 



No. Feet Inches Feet Inches 



quarry to and including No. 5 were obtained 



from the outcrops in the upper part of the pit 



in the floor of the quarry. 1 1 8 76 5^ 



4. Dayton limestone. — This zone was not exposed 



at the time the quarry was studied on August 



29, 1914. Mr. Brandon, however, stated that 



it is 12 feet in the pit from the bottom of the 



quarry to the white "Clinton" limestone. If 



the statement that it is 12 feet from the floor 



of the quarry down to the top of the white 



"Clinton" is correct, then the Dayton lime- 

 stone has a thickness of about 8 feet 3I inches. 



Mr. Brandon described it as a hard, blue 



stone 8 3^ 74 9 | 



3. Brassfield limestone. — Mr. Brandon stated that 



in the well drilled at the engine house in this 



quarry the white "Clinton" is between 18 and 



20 feet thick 19 o 66 6 



2. Richmond formation. — Mr. Brandon stated that 



below the white "Clinton" the well passed 



through 45!=*= feet of blue stone, and the 



base of this zone he reported as no feet 



below the mouth of the well in the engine 



house 45 6 47 6 



1. The well penetrated 2 feet of rock, which is 



described by Mr. Brandon as reddish "granite." 



Bottom of well 2 o 2 o 



A halftone of the eastern wall of this quarry, the one described 

 in the foregoing section, is given in Fig. 1. The lower part 

 of the wall shows the Laurel limestone. Mr. Cottingham's 

 foot is on top of the "mottled zone," his hand marks the base 

 of the 10^-foot zone of Springfield dolomite, while the extreme 

 top of the bank below the building is the basal part of the Cedar- 

 ville dolomite. 



The foregoing record is an important one in the series of sections 

 in this part of the state, since there is a continuous exposure from 

 the Osgood shale up and into the lower part of the Cedarville 

 dolomite. The Laurel limestone is well shown and has a thickness 



