STRATIGRAPHY OF OHIO WAVERLY FORMATIONS 663 



central Ohio.^ In view of the debated age of the Bedford, such an 

 unconformity, if widespread, would be urged, and indeed it has 

 already been suggested by Prosser,^ Girty^and Burroughs'' as evidence 

 for the separation of the Bedford from the remainder of the Waverly 

 and of its affiliation with the Devonian. It is therefore important 

 to emphasize that there is no evidence seen by the writer south of 

 Lithopolis in Fairfield County of the existence of any such plane 

 of unconformity. There is irregularity 

 at the plane which in some sections 

 appears to be this contact, but appar- 

 ently of the same kind and of no more 

 importance than many other similarly 

 irregular bedding planes, often in the 

 same section, and not of a nature, so 

 far as observed by the writer, to 

 warrant description as evidence of 

 erosion. On the other hand, at many 

 localities, there is a gradation from the 

 Bedford to the Berea, sometimes 

 abrupt, elsewhere gradual. The Berea 

 of southern Ohio is only a phase of the 

 Bedford; they consist of precisely the same kind of sediments with 

 the same ripple-marked structure, a sedimentary structure sopecuhar 

 and unusual that its occurrence in both Bedford and Berea can^ot 

 be urged as an insignificant coincidence by anyone at all famiHar 

 with sandstone formations and their structures. Almost the only 

 distinguishing feature between them is that the sandstone beds are 



' W. G. Burroughs, "The Unconformity between the Bedford and Berea Forma- 

 tions of Northern Ohio," Jour. GeoL, XIX (ign), 655-59; C. S. Prosser, "The Dis- 

 conformity between the Bedford and Berea Formations in Central Ohio," ibid., XX 

 (1912), 585-604; C. S. Prosser, "The Devonian and Mississippian Formations of 

 Northeastern Ohio," Geol. Surv. Ohio, 4th ser.. Bull. 15 (1912); W. G. Burroughs, 

 Economic Geol., VIII (1913), 480-81; "Berea Sandstone in Eroded Cleveland 

 Shale", Jour. Geol., XXII (1914), 766-71- 



2 C. S. Prosser, Geol. Surv. Ohio, 4th ser.. Bull. 15 (1912), 511, 512. 



3 George H. Girty, "Geological Age of the Bedford Shale of Ohio," Annals New 

 York Acad. Sci., XXII (1912), 296. 



4/oMf. Geol., XXII, (1914), 771- 



Fig. I. — B. This outline map 

 is a guide map to indicate the 

 position in Ohio of the area 

 mapped in the large one. 



