194 
[Assembly 
from 48th-street on the north to 14th-street on the south, and on the 
east side from 24th-street to Corlear's hook. 
On the south side of 14th-street, between Bowery and 3d avenue, is 
a boulder of this rock 15 feet long, 12 broad, and 6 high, containing 
on its surface abundance of diluvial scratches running longitudinally. 
Again, 30 feet west of 3d avenue, on the south side of 16th-street, 
and 40 feet distant from it, is another boulder, 13 feet long, 8 broad, 
7 high. It is uniform in texture, like that on 63d-street, in place, and 
is covered with scratches running longitudinally. 
Another 12 feet long, 8 broad, and 8 high, is lying in 25th-street, 
about 20 rods west of 4th avenue, covered with scratches in every re- 
spect like those of the last. 
Now had these boulders (which, I doubt not, have all been derived 
from the same rock,) followed strictly the course of the current indica- 
ted by the diluvial grooves on the island, they would have been found 
along the Bloomingdale road, near the 8th avenue, and from thence 
eastward to Kipp's bay and the alms-house, and possibly somewhat lower 
down; instead of which, they have been carried much farther south, to 
Corlear's hook, and even on Long-Island. 
I will here remark, that I strongly suspect there are other localities 
of this rock eastward of this island; for boulders of the same character 
resembling most perfectly specimens of this island, have been found at 
West Farms, New Rochelle, and Sawpits, which could scarcely have 
been transported from the locality on this island. 
7. GrayivacJ<x — Which is common in the valley of the Hudson. I 
have seen specimens found many years ago, in grading the streets at 
Corlear's hook. These specimens closely resemble the rock brought to 
this city for the purpose of flagging the sidewalks, from Coeymans and 
Coxsackie, also from Esopus creek, but as no specimens have come to 
my observation recently, or since about 1830, 1 cannot speak from per- 
sonal knowledge. 
8. Limesioney like that of the Caiskill or Helderhergk TnountainSy 
abounding in produdusj has been found at Corlear's hook, and in other 
places in the southern part of the island. I have a single specimen in 
my cabinet, obtained at that place in 1826, at the depth of 40 feet be- 
low the natural surface. It was then a boulder 2 or 3 feet in diameter, 
and has been distributed so that but a small fragment now remains. I 
