“ , . fea 
250 W. SB. Dwight—Fossils of the Wappinger Valley. 
stone which is beyond question Trenton. 
IL. Its orthoceratites differ notably from any similar collec- 
tion, taken as a whole, as far as I know, in either the Trenton 
or the Black River groups, in the facts that no species are 
found among them whose septa are more distant than about 
nine to the inch, most of them having septa standing much — 
more closely; and the additional feature that with the rarest 
exceptions the siphons are lateral, if not marginal, with a ten- 
ency to be proportionally very large throughout the group. _ 
Ill. Everywhere closely intermingled with the orthoceratites 
are various gasteropods appearing " 
accounted characteristic of the Calciferous of the United States 
and of Canada. Notably there are admirable specimens of the 
Ophileta compacta, fortunately fully described and illustrated — 
Op 
by Salter. (Geological Survey of Canada, Decade I, p. 16. 
Except for the presence of thes 
be 
to be identical with those 
a 
bay 
lt eee Ee 
——— 
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