STRATIGRAPHY OF OHIO WAVERLY FORMATIONS 66i 



of all three a few miles to the eastward. It is true, as will be 

 pointed out, that on the Ohio River the lower part of the Logan 

 sandstones pass into shales that are, so far, indistinguishable from 

 the upper part of the Cuyahoga and are included in the upper 

 part of the Cuyahoga. Nevertheless, for the reasons just stated, 

 the conceptions of Logan and Cuyahoga are exceedingly con- 

 venient ones, whatever may be their actual stratigraphic impor- 

 tance to be determined later. Final decision should be reserved 

 until the evidence of the faunas can be presented. 



Perhaps the greatest innovation from the Waverly column as 

 heretofore established is the reduction in rank of the Black Hand 

 formation. This had come to be regarded as a distinct formation 

 between the Cuyahoga and Logan, a stratigraphic unit that had to 

 be considered in any attempt at correlation of rocks of this general 

 age. It is, however, a local development of the Cuyahoga and is, 

 apparently, not as important a stratigraphic unit as any one of the 

 three members of the Logan. 



BEDFORD AND BEREA FORMATIONS 



In the classification of the Waverly formations here presented, 

 the Bedford formation has been included. By such inclusion it is 

 not intended to express any opinion in the discussion now being 

 waged as to whether this formation should be placed in the Devon- 

 ian or should be retained in the Waverly as was the practice for 

 many years; it is here retained largely because such has been the 

 practice. The present discussion does not attempt to correlate 

 this or other subdivisions of the Waverly with the standard time 

 scale because that would involve discussion of the faunas, a subject 

 not yet ready for presentation. An earlier paper by Hyde on a 

 special phase of the Bedford and Berea gives their general char- 

 acter in southern Ohio although by no means a summary of the 

 various problems connected with them.^ 



One feature there mentioned should be emphasized. Since 

 that paper was published several papers have appeared describing 

 the unconformity between the Bedford and the Berea in northern and 



^ Jour. Geol., XIX (1911), 257-69. 



