100 
The locality where the quarrying operations were carried on, was at 
high water mark, and they dug perhaps too near the level of low water. 
Good blocks of this rock could scarcely be expected free from cracks, 
where they had been exposed to the beating surf and the winter's frosts 
for ages. A large portion of the hill south of the beach, and of the lo- 
cality at the southeast end of the beach, is composed of serpentine rock, 
and it is not impossible that quarries of some value may be opened 
there. • 
Another locality of serpentine rock, with radiating fibres of antho- 
j)hyllite,? occurs in a southeasterly direction from White Plains three or 
four miles. I did not see it, but was informed of it, after I had left 
that part of the country. I had inferred the existence of such a loca- 
lity from the boulders of this rock, which I saw scattered over the fields. 
Another locality is in Philipstown, Putnam county, about ten or eleven 
miles NNE of Peekskill, and about half or three quarters of a mile east 
of Horton's pond. The rock is of a blackish green, fine grained, and 
sometimes coarsely crystalline. It is yellowish on the weathered sur- 
faces, and is associated with steatite. Ten to eleven acres seem to be 
underlaid by this rock, which might be quarried for an ornamental mar- 
ble. It is about eight miles from w'ater transport. 
Another locality, one that has already attracted much notice, is 
Brown's quarry near Pine pond in Putnam county, four or five miles 
from Putnam Court-House, and one and a quarter miles NNW of the coun- 
ty pcor-house. It is dark coloured, dark green to black, and from com- 
pact to a coj^rse crystalline, like coarse grained hornblende rock. It is 
granularly foliated like common white marble, polishes well, and is per- 
fectly black when polished. It may be obtained in large blocks for 
sawing into slabs. Large blocks lie on the surface in Brown's lot, and 
the rock is seen in place all around the hill. In the mine lot adjacent, 
good blocks may probably be obtained by quarrying. 
Twenty-five to thirty acres of ground are underlaid by this rock on 
the hill side, west of the brook, which is the outlet of Pine pond. 
It is easily accessible, and about 100 feet above the water level of the 
adjacent valley. Blocks of many tons w^eight can be easily procured; 
in fact many of this size are now lying on the surface, and require no 
blasting or splitting before they are put in the saw-mill. Magnetic ox- 
ide of iron, or chromate of iron, is disseminated through the serpentine 
in some parts of the serpentine bed, and this variety of the rock will 
not be suitable to woikj as it ran neither be sawed nor polished easily. 
