352 CH. i K l. ES S. PXl )SSER 



of about o, 1 ; feet, which is 2 feet more than its thickness in 

 the Maxwell quarry of Ludlow Creek. Samples of the Laurel 

 limestone from this quarry were analyzed by Professor D. J. 

 Demorest with the following result: 



The "mottled /.one" is also thicker, since in this quarry it is 7 

 feet - 1 inches, while it is only 5 feet 6 inches in the Maxwell quarry. 

 The Springfield has a thickness of 13 feet 3 inches, overlying which 

 is the lower ^ feet 8 inches of the Cedarville dolomite. The north- 

 ern wall of this quarry extends higher stratigraphically than the 

 eastern wall below the crusher, and on this wall the "mottled zone" 

 is feet 10 inches thick, above which is 13 feet of Springfield dolo- 

 mite, capped by 9 feet 5 inches oi Cedarville dolomite. At the 

 northern end of the eastern wall almost 10 feet of the Cedarville 

 dolomite is shown. 



An illustration of this quarry has been published 1 under which 

 appear the names "West Union, Springfield, and Cedarville lime- 

 stones." The West Union probably refers to what is listed as the 

 "mottled layer" in the foregoing section. 



The recent bulletin by Professor Bownocker contains a section 

 of this quarry' in which the "West Union limestone" corresponds 

 to the "mottled zone," No. 17 of the foregoing section, and the 

 upper limestone of the "Osgood beds" corresponds to what the 

 writer correlates with the Laurel limestone of Indiana, Nos. 6-16 

 of his section. The 2 feet of "dark-blue shale" of Professor 

 Bownoeker's section corresponds to Xo. 5 of the writer's section. 

 and he considers the top of this shale as corresponding to the top 

 oi the Osgood beds in Indiana. 



1 Eighth Annual Report of the Stale Highway Deportment of Ohio (1913), Fig. 0. 

 p. 257. The geological pan of the report is probably to bo credited to Mr. \V. C. 

 Morse, judging from the statement on p. 17. 



1 Geological Survey of Ohio, 4th Ser., Bull. 1$ (1915), p. 36, and PI. Ill opposite 

 this page apparently gives a view of this quarry or one in its vicinity. 



