676, JESSE E. HYDE 



the thickness of the entire Cuyahoga is greatest over this lobe and 

 the main conglomerate area and diminishes somewhat in the slight 

 sag between them. 



The principal considerations in support of this are: (i) the 

 lack of evidence of any pronounced anticlinal structure in the 

 underlying rocks, although the region has been drilled over for 

 years in the search for gas and oil; (2) the increased thickness of 

 the Berne member in the trough and its diminished thickness over 

 the crests; the same is true to some extent of the next succeeding 

 bed, the Byer member of the Logan. 



On the western side of the Hocking Valley province, the inch- 

 nation of the top of the Black Hand (and with it the Berne member, 

 which is uniformly thin) becomes considerably lessened and the 

 niember may even sink slightly to the westward, notwithstanding 

 the general regional rise of the older rocks in that direction. At 

 the Rock House, about 11 miles west of Logan and just south of 

 the south edge of the Lancaster sheet, the elevation of the top of 

 the Cuyahoga, that is the top of the Berne member, is 1,060 feet 

 above sea level. Eight and one-half miles almost due southwest of 

 this point on the Ross-Hocking county line, the same horizon oc- 

 curs at only 975 feet, a decline of 85 feet contrary to the general 

 regional dip. The dechne in the surface of the formation is here 

 clearly due to the westwardly decrease in thickness of the 

 Cuyahoga. 



The Berne member differs very decidedly from the conglom- 

 erates lower down in the presence of a marine fauna. This is 

 seldom abundant, either in species or in individuals, but the fossils 

 are so widespread, both in the finer beds and in coarse conglom- 

 erates, that they may be considered an essential character. 



In the region of the Hocking Valley facies, it is found in its 

 simplest form over the central and western portions. Here, with 

 a few exceptions, it is a more or less massive coarse sandstone with 

 abundant pebbles, on the whole always decidedly coarser than the 

 Black Hand, and usually from one to three feet thick. It becomes 

 thinner westward so that it is usually about one foot thick on the 

 western margin of the region. It even extends westward for a 

 few miles beyond where the Black Hand becomes shaly and in 



