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Fig. I. — A. Map showing outcrop belt of Waverly formations of central and 

 southern Ohio, bounded on the western side by Devonian and Silurian rocks, on the 

 eastern side by the Pennsylvanian. These boundaries are drawn only approxi- 

 mately and are generalized. The conglomerate and sandstone facies of the Cuyahoga 

 are stippled, at the northward the Toboso conglomerate area, near the central por- 

 tion the Hocking Valley conglomerate facies, and in the southwestern part the Vance- 

 burg facies; intervening are the Granville and Scioto Valley shale facies. Question 

 marks indicate uncertainty due to removal by erosion, burial beneath glacial deposits, 

 or unobserved areas. The known western margin of the Allensville member of the 

 Logan is represented by a line east of the center of the Waverly belt. Near the Ohio 

 River its actual stratigraphic western limit is represented by a continuous line. From 

 there northward to Hocking County its known westernmost occurrences are repre- 

 sented by coarse dashes^ — the horizon occurs possibly as far west as the dotted line 

 and its disappearance westward is known in northern Scioto County, but the precise 

 zone of disappearance is not located. From Hocking County northward it extends 

 as far west as the westernmost outcrops of its horizon, represented by short dashes. 



