50 W. B. Dwight— Wappinger Valley Limestone. 
Art. VIIL—Recent Haplorations in the Wappinger Valley Lime- 
stone of Dutchess County, New York; by Professor W. B. 
Dwieut, Vassar College, Poughkeepsie, N. Y. 
No. 2.—CaLciFEROUS AS WELL AS TRENTON Fossits IN THE W AP- 
PINGER LIMESTONE AT RocHDALE AND A TRENTON LOCALITY 
at Newsurea, N. 
HavING made further explorations in the limestone of the 
Wappinger Valley, since the publication of my former article,* 
I now present some of the new results obtained ; and first those 
at Rochdale. Before doing this I would express my great obli- 
gations to Mr. R.. P. Whitfield and Mr. S. W. Ford, for their 
cordial assistance in advising me concerning fossils of whose 
nature I was not confident, and in naming several which I had 
failed to identify. 
n my former paper, 1 mentioned finding at Rochdale 
fossils of the Trenton limestone, whose names, as far as iden- 
tified, were given. I have now to report the discovery also of 
Calciferous fossils in the Rochdale limestone belt, besides 
adding to the facts respecting the Trenton fossils. 
The Cheetetes of the Rochdale Trenton beds, composed of 
extremely fine columns, described as probably new, and for 
which the name Ch, tenuissima was suggested, bas since been 
identified as in part, at least, Stromatopora compacta of Billings,t 
which Dawson has shown to be a Chetetes, and has named Ch. 
compacta. Since, however, the greater part of the specimens 
observed at this locality, although extremely fine-columnar, 
are yet decidedly and uniformly coarser than the particular 
specimens (from Pleasant Valley) which were thus identified, 
and as microscopic sections, which are under study by myself 
and others, promise to show other constant differences, [ do not 
et abandon the name proposed, as it may. still cover the 
majority of these corals. 1 leave the subject until further 
investigation shall enable me to report upon it more decnaltely: 
I ition to my former list of Trenton fossils from Roch- 
dale, I have secured quite a number of Cyathophylloid corals: 
and among them, with little doubt, Petrara corniculum, in some 
specimens of which the radiating lamelle are very well defined. 
I have also obtained several more specimens of Leptena sericea ; 
a large number of Orthis pectinella, and others which are prob- 
ably O. tricenaria ; a caudal shield of a trilobite, which has been 
identified by Mr. Ford as Jl/enus crassicauda, and is nearly two- 
thirds the size of the largest specimen figured by Hall;} and 
* This Journal, May, 1879. + Pal. Foss., 1862, vol. i, Black River Group. 
¢ N. York Geol. Rep., Pal., vol. i, Pl. 60. 
