Finke iat. LAS a2 Be te Pa 
hs 1 * b u 
SRelte : 
es) 
“he 
W. B. Dwight—Fossils of the Wappinger Valley. 251 
Calciferous group. But the presence of these new fossils, to 
say nothing of existing doubts as to the true stratigraphic 
relations of much that has elsewhere been called Calciferous, 
suggests great caution in deciding upon the horizon. 
n the other hand, thege fossils as a whole, cannot at pres- 
ent be safely assigned to any other group with so much justifi- 
cation as to the Calciferous. They will be so assigned at this 
time, but with the understanding’ that it is a provisional 
arrangement. 
A more full discussion of the age of this rock will be 
appropriate after the fossils have been more fully described, 
including the important gasteropods above mentioned. 
This Calciferous formation, accompanied in many places by 
the Trenton in much smaller masses, displays. its fossils for a 
number of miles above and below Poughkeepsie, in the Wap- 
pinger Valley. By far the richest locality, however, is at the 
hamlet of Rochdale ; especially are the orthocerata the largest, 
and the most crowded together in a low ledge on a hill-side 
about 900 feet northwest of the woolen mills. 
Tam much indebted to the kindly and most valuable assist- 
ance of Mr. R. P. Whittield in the difficult study of the 
specimens as well as in the drawing of some of the figures. 
Figures 1, la, 4 and 5 were outlined by him from the type 
_ Specimens. 
In my descriptions of Rochdale fossils, the richly fossiliferous 
ledge exposed for 200 or 300 feet each side of the cross-wa 
between the farms of H. Titus and W. Badgely, about 900 feet 
_ northwest of the woolen mill, will be named D. Another Cal- 
_ ¢iferous locality, next to the one just mentioned in paleonto- 
logical importance, designated F, consists of a series of out- 
_ ¢rops barely above the surface of the ground in W. Badgely’s 
field extending from the northerly extremity of ledge D, be- 
tween two hills, to the Pleasant Valley turnpike, with which it 
_ is about on a level throughout. This locality is specially rich 
in small and neat annulated and other orthocerata, while the 
: ledge D is filled with the larger Cephalopods. 
; 
ae CRUSTACEA. 
_ Quite a number of fragments of trilobites have been collected 
_ at locality D. One which is a portion of a thickened margin 
of a cephalic shield, is 5™ long and 18™™ wide. But the frag- 
ments which are sufficiently well preserved to admit of specific 
description are small, belonging to animals probably 5% or 
_ Under in total length. The cephalic shields of the two species 
here described are not sufficiently complete to justify a satis- 
factory decision as to the genus. The courses of the facial 
i 
