W. B. Dwight—Fossils of the Wappinger Valley Limestone. 391 
having a westerly dip of 70° to 85°, the strike averaging about 
N. 26 EH. (true). Thus far I have succeeded in finding here 
only the spiral shell met with at Rochdale, and three small but 
very distinct Orthocerata. This spiral shell occurs in particular 
layers extending through this entire section; some specimens 
appear to be scattered through the rock, but in these layers 
they exist in immense numbers. n a single surface of 50 
square centimeters, which I broke out of the solid rock, there 
are more than twenty distinct specimens. This is beyond the 
average, but the specimens are often so numerous as to crowd 
upon each other. 
The best localities I have discovered are in two quarries of 
F. B. Wallace, on Wappinger’s Creek, respectively one and 
one-quarter and one and one-half miles below Salt Point; and 
in two cuts on the Poughkeepsie, Hartford and Boston Railroad 
track, two miles north of Pleasant Valley. Generally only the 
simple spiral line is preserved in section. In many cases, 
width increases gradually, the spirals being closely coiied. 
few of these spiral shells are loosely coiled ; and some, whose 
whorls present an angular edge, are of essentially different 
_ character from the others. From present appearances i should 
_ judge most of these shells to be those of Zrucholites, but I hope 
_ Soon to secure more decisive specimens. : 
_. At Manchester, three miles east of Poughkeepsie, no organic 
_ Temains appeared, except a beautiful fucoid, which had much 
resemblance to Buthotrephis gracilis, and covered a large slab of 
ro 
le. 
he results in fossils, of my examinations, the specimens of 
_ Which were taken in every instance from the solid rock in 
_ place, may be summed up as follows :-— 
Am, Jour. 8ct.—Turp gree Vou. XVIL—No. 101, May, 1879. 
