BULLETIN OF THE LABORATORIES 
II4 
may be sufficient to indicate at least a partial escape from the apparent 
dilemma introduced by the results of paleontological study*. 
ADDENDA. 
PTERiNOPECTEN L^TUS. H. 
(Plate V, Fig. 13.) 
A single left valve which cannot be distinguished from the quoted 
Portage species, was found at Moot’s run. 
SPIRIFER KEOKUK. 
Specimens of this or a closely allied species occur in the upper 
layers at Rushville and Loudonville. 
LEIOPTERIA ? ? NEWBERRY!, sp. a. 
(Plate XI, Fig. 31; also Vol. Ill, Plate VII, Fig. 36,) 
This species is anomalous, at least we know no close analogue 
in any Carboniferous or Devonian genus. From any of the species 
here described it may be distinguished by the great height and uniform 
■^Trof. Orton’s statement that the Cleveland shale is identified in central Ohio, 
is contrary to all statements of other geologists and apparently very .slightly sup- 
ported by observation. There is a considerable lithological difference between 
the Cleveland shale of northern Ohio and the Huron near Columbus, though 
Prof Orton identifies one with the other, apparently without regarding the diffi- 
culty of disposing of the great Erie shale with its Chemung fossils, which separ- 
ates them at the north. 
It is not at present possible either to affirm or deny the extension of the 
Erie to the south-east, as the testimony of drilled wells is very ambiguous where 
minute differences and especially when palccontological considerations are in ques- 
tion. 
A glance at Prof. Orton’s useful map and sections of the Berea will strongly 
reenforce the view here presented. The south-eastward extension of the Waverly 
basin as contrasted with the north-eastward extent of the Chemung area is very 
'Obvious. The thickening of the Erie and Cleveland shales will be seen to cor- 
respond nearly to a change in dip, the line of which forms an anticlinal south of 
Akron, etc. So far as can now be gathered the red or true Bedford shale does 
not extend far to the north-east in Ohio. The great thickening of the Berea grit 
to the north-east is addition evidence of the near proximity of the shore of the 
Berea sea. At Youngstown there are about 150 feet of Berea, at Martin’s Ferry 
130 feet. 
