554 



APPENDIX 

 Generalized Section for Ohio. 1 



Names of Formations. 



Thickness 

 in Feet. 



Characteristics. 









a 



1" 



Dunkard formation. 



525 ± 



Sandstone, generally massive, shales, lime- 

 stone, and thin coal-seams; non-marine at 

 least in part. 



d 



Monongahela forma- 

 tion. 



200-250 



Shales, limestones, and sandstones, with im- 

 portant beds of coal. 



03 



'3 



> 



Conemaugh formation. 



400-500 



Upper part mainly shales; lower pari sand- 

 stone, with some shale and limestone. 



02 



1=1 

 A® 



Allegheny formation. 



165-300 



Shales, limestones, and sandstones, with im- 

 portant coal-seams. 





Pottsville conglomer- 

 ate. 



250 ± 



Light-colored sandstones and conglomerates, 

 with some shale and a few coal-seams. 





Ma; 



02 

 • 22 

 V 



VI 



>> 1 



> 



cville limestone. 



25 ± 



Fossiliferous limestone, often brecc'ated. 





Logan group. 



100-150 



Sandstone, massive conglomerate, and shale. 



d 



02. 1 



Black Hand con- 

 glomerate. 



50-500 



Sandstone and fine conglomerate. 



Cuyahoga shale. 



150-300 



Light-colored, argillaceous shales, with thin 

 beds of sandstone. Shales characterized by 

 ferruginous nodules. 



02 



9 



Sunbury shale. 



5-30 



Black bituminous shale. 





Berea grit. 



5-175 



Sandstone, used for building-stone and for 

 grindstones; locally carries oil, gas, and brine. 





Bedford shale. 



50-150 



Thin-bedded shales; occasional thin beds of 

 sandstone. 





' Ohi 



o shale. 



300-2600 



Mainly black or dark-brown shale. 



d 



o3 



"3 



Olentangy shale. 



20-35 



Blue, highly fossiliferous. 





Delaware limestone. 



30-40 



Blue, thin-bedded. 



, Columbus limestone. 



110 



Light-colored, often containing chert masses. 





Monroe formation. 



50-600 



Compact magnesian limestone, usually poor in 

 fossils. 



I 



=5 ' 



Niagara group. 



150-350 



Light-colored shales at base, dolomitic lime- 

 stone above, and a thin sandstone bed at 

 top. 



□5 



Clinton limestone. 



10-50 



Crystalline, locally replaced by iron ore. 





Medina shales (?) 

 . (Belfast bed). 



50-150 



Red or yellow, non-fossiliferous shales, with 

 local thin beds of sandstone. 



1 Prosser, Jour, of Geol. 

 Bull. 7, 4th Ser., 1905. 



Vol. XI, pp. 520, 521. Geol, Surv. of Ohio, Vols. VI and VII, and 



