134 
Frank Carney 
its and moraine terraces. Ice erosion has not lowered the major 
valleys so as to rejuvenate tributaries; in fact, glaciation in general 
has prematurely aged the streams of this area. Practically all the 
valleys bear flood-plain material, and during the post-Wisconsin 
interval a youthful stage of the erosion cycle has scarcely yet 
reached this far into the uplands. 
STRATIGRAPHY 
{a. Formations) 
Cuyahoga Formation. Along the Rocky Fork, a little east of 
the eastern border of the township, the Cuyahoga appears, but 
the interval up stream before reaching the base of Black Hand 
is covered with alluvium. 
Beneath the bridge across the stream at Wilkins’ Corners, 
occur shales which may belong to the Cuyahoga. There is some 
indefiniteness, however, about this mapping owing to the fact that 
the upper part of the Cuyahoga may contain “arenaceous and 
^argillaceous shales with some alternating layers of sandstone,”^ 
thus resembling the lower part of the Black Hand formation which 
sometimes contains thin shaly layers. 
Aside from these localities, I have not found anywhere in the 
township, outcrops of the Cuyahoga. That the formation has 
been deeply incised appears probable from the width of some of 
the aggraded valleys. 
Black Hand Formation. Outcrops of this formation are widely 
distributed throughout the township. Actual contacts with the 
Cuyahoga, and with the superjacent Logan formation are rare. 
At the Lost Run section, the upper contact is well established; 
here the Black Hand measures 34 feet and 7 inches between Con- 
glomerates I and H; below this I measured 29 feet and 4 inches 
above the covered flood-plain interval (fig. 2). Its lower part I 
contains no very heavy beds, but towards the top of the section, 
nearing the horizon of the Allorisma shales or Fucoid layer (fig. 
3), the strata thicken and have been used somewhat for building 
blocks. An unrecorded feature of the Black Hand formation is 
® C. S. Prosser: “The Waverly Formations of Central Ohiof 
Geologist^ vol. xxxiv, p. 359, 1904. 
The American 
