106 BULLETIN OF THE 
well known in the neighborhood and easily reached by a walk of two 
miles and a half from Cheshire station of the New Haven and North- 
ampton Railroad, or by a less distance from the station of the same 
name on the Meriden, Waterbury, and Connecticut River Railroad. It 
gives the only good exposure of the overlying strata known to us on the 
back of the western trap sheet, and deserves careful examination. 
The trap here is without vesicles throughout its mass; holocrystal- 
line except at contact with other rocks; at its upper contact it is 
extremely fine-grained and glassy ; flowage action is seen in the micro- 
scopic arrangement of the feldspar prisms parallel to upper line of 
junction. Upper surface of sheet obliquely traverses the beds of the 
overlying sandstones and shales ; several small offshoots of fine texture 
extend into the overlying rock (Fig. 12). Pebbly sandstone directly 
above the sheet does not contain fragments of trap, and is not per- 
ceptibly affected by the igneous mass even close to the junction; the 
shales that elsewhere approach the sheet are apparently indurated. 
See special account. 
Section numbers, 45-55. Palisade Range, New Jersey. 
The easternmost or lowest trap sheet of the New Jersey Triassic area 
seems to correspond with the lowest or westernmost sheet of the Con- 
necticut area, and is therefore referred to here in order to extend the 
number of examples quoted. Its base is finely exposed in contact. with 
the underlying sandstones at the Hamilton-Burr duel ground in Wee- 
hawken, on the bank of the Hudson, opposite New York City ; this out- 
crop is well figured in Plate IV. of the Annual Report of the New Jer- 
sey Geological Survey for 1882. Other exposures of the underlying 
sandstone are common up the west bank of the Hudson, but contacts 
are relatively rare. The only upper contact known is one pointed out 
some years ago by Professor Cook (Geology of New Jersey, 1868, p. 201), 
in Englewood, about a mile south of the station of that name on the 
Northern New Jersey Railroad, in a brook channel a few hundred feet 
west of a road. 
The trap of this sheet is dense throughout, as far as examined at 
numerous outcrops. Its texture is rather coarse in the middle of the 
sheet, but becomes very fine at lower and upper contacts. The adja- 
cent bedded rocks are distinctly altered from their original condition, 
with the development of new minerals. No fragments of trap are 
found in the overlying beds. a 
Under the microscope the trap is seen to be almost identical with that 
