STRATIGRAPHY OF OHIO WAVERLY FORMATIONS 677 



eastern Ross County is found resting on typical Cuyahoga shales, 

 itself reduced to a horizon of a few inches of soft clay shale or clay 

 ironstone with many small quartz pebbles imbedded therein. It 

 does not pass into sandstone before its final disappearance; it is 

 a pebble bed up to the point of its disappearance. 



The Berne member attains its greatest known thickness in the 

 trough between the two domes of conglomerates mentioned above, 

 where, near Enterprise in Hocking County, it is at least 16 and 

 probably 20 feet thick. It there consists of many thin beds of fine 

 pebbles alternating with thin beds of sandstone of varying coarse- 

 ness, the whole suggesting aggradation of different kinds of ma- 

 terial brought by continually shifting currents from the more 

 exposed, shallower portions of the adjacent conglomerate masses 

 to the more sheltered deeper water between them. The member, 

 here and over its entire area, can best be interpreted as the concen- 

 trate of pebbles and coarse sand which resulted from the reworking 

 of the top of the earlier deposits by wave and current action. This 

 must have happened soon after the completion of the deposition 

 of the underlying conglomerates and while they were but slightly 

 consolidated. 



It is not certain whether the Berne member should be considered 

 the topmost member of the Cuyahoga or the base of the Logan 

 formation. Lithologically it falls readily with the Cuyahoga con- 

 glomerates, and in the event of mapping the region it will prove 

 a most convenient upper boundary. There is very good reason to 

 believe, however, that from the point of view of historical suc- 

 cession it belongs with the Logan. This conclusion is supported 

 by several considerations, (i) The base of the bed is sharp, and 

 in places is undoubtedly a plane of erosion as where, near Logan, 

 the horizontal beds of the top of the Black Hand have been removed 

 and the Berne member truncates the inclined beds of the Black 

 Hand. (2) There is occasionally a transition from the Berne mem- 

 ber to the Logan although never more than a few inches thick, as 

 in the railroad cut at Hanover (Licking County) and at localities 

 in Hocking County. (3) Beds very like the lower member of the 

 Logan, although usually somewhat coarser, are frequently present 

 in the Berne member east of the Hocking Valley province. (4) The 



