58 T. N. Dale—Clay-slates and Grits of Poughkeepsie. 
unfossiliferous, and thus a question has been raised as to their 
real age 
In the = ite 3 of 1878, I discovered in a ledge of argillaceous 
schist, back of the observatory of Vassar College, and a few 
rods bao the college fence, some fossil Brachiopoda. 
Shortly afterward I found others, together with Crinoid stems, 
at the first ledge of glaciated rock on the Stormville road, be- 
tween Casper Creek and the first limestone ridge. Again in — 
November and December of the same year, in ascending the | 
first range of high hills which rises about a mile west of the 4 
Hudson* opposite Poughkeepsie, I came across a large outcrop — 
of argillaceous schist, containing an abundance of Brachiopoda a 
and Crinoid stems. After it had become known that fossils a 
were to be found in the vicinity of Vassar College, several of 
the students found some, and Mr. H. Booth of Poughkeepsie, — 
collected a number of Brachiopoda and Crinoid stems at the | 
ledge back of the observatory. On another visit to the locality | 
on the base of Marlborough Mountain, I found a univalve shell | 
and tees - 
‘debt ed to Mr. James Hall, the State Palconta a 7 
the pdentifioation of the fossils from these localities. The a 
: Orthis testudinaria Dalm. ; Orthis pectinella Con.; Lentil 3 
sericea Sow. ; Strophomena altzrnata Con. ; Buthotrephis subno- 
dosa Hall. 4 
The cast of the univalve hardly admits of perfect determina — 
tion, but it strongly resembles that of Bellerophon bilobatus. 4 
and of the spaces between the joints are preserved, and might 
- = mistaken for stems with annular corrugations on the 
exter 4 
ni some parts of the rock, Crinoids are very pei in 
others Orthis testudinaria forms a conglomerate. Leptena sert 
cea, Orthis testudinaria and the Crinoid stems are charac wed 
of both the Vassar College locality and of that on the west of the 
Hudson. The Brachiopoda are ‘represented by internal casts, 
impressions of both exterior and i alongs and by the shell itself 
in a greatly altered state. Sometimes the calcareous shell is 
preserved with but little pieiion The more minute striz 
Leptena sericea can be counted in some specimens. Nearly 
the fossils are more or less distorted. The general character 
the rock is the same on both sides of the river. There 
irregular alternations of grit, clay slate and shale, in some vlaeel 
be take this hill to be a continuation of what Mather calls Marlborough Mout 
des 
