STRATIGRAPHY OF OHIO WAVERLY FORMATIONS 675 



Lancaster sheet and has not been visited since 1910, when it was 

 unmapped. 



On the eastern side of the main body of the facies, that is, that 

 portion of it lying west of the Hocking River, the top of the Black 

 Hand dips to the eastward at a rate which varies considerably from 

 point to point, but is much greater than the general regional dip. 

 In north-central Hocking County the dip over much of this side 

 is about 35 feet per mile, but reaches a rate of 119 feet for a distance 

 of a mile on the eastern flank, just west of Hocking River. A few 

 miles north of this, the dip is about 3 7 feet per mile over the center 

 of the conglomerate area, increasing to an average of 58 feet over 

 most of the eastern flank, but with no indication of the extreme 

 dip observed for the short distance farther south. Along the 

 eastern margin of this steep slope the surface of the Cuyahoga is 

 carried down nearly to the level of the main drainage lines, but 

 after continuing for a short distance thus, it recovers and rises to 

 the eastward in a broad low arch a few miles wide, within which 

 cliffs of Black Hand 40 or 50 feet high are exposed; beyond this 

 to the eastward it sinks rapidly below drainage. This broad low 

 arch is exposed for four or five miles along the Hocking River above 

 Logan and again along Rush Creek in Hocking County several 

 miles to the northward, as well as along the intermediate smaller 

 streams. It is very like a broad, low anticlinal fold with its axis 

 trending in a generally north-south direction. However, it does not 

 appear probable that the doming of the surface is due to gentle 

 regional warping, although this possibility has not been disproved. 

 It seems more likely that this dome is a second smaller conglomer- 

 ate mass lying a short distance east of, and nearly contiguous to, 

 the main mass, and is, indeed, merely a lobe of the main Hocking 

 Valley area. The structures observed in the exposed portions 

 bear this out, the material being conglomerate with northerly dips. 

 It probably dies out north of Rush Creek, for no trace of it was 

 observed farther north and east of Lancaster where the sandstone 

 loses its pebbles and structures immediately east of the Hocking 

 River, and the surface decHnes regularly to the eastward. The 

 contour of the upper surface of the Black Hand is thought to 

 be due to the influence of this separate lobe of accumulation, for 



