DRIFT DIVISION. 
183 
parts that the whole seems to be one entire mass. There are others, again, where the cement 
puts on the appearance of jasper, and hence the name of jasper rock, which has frequently 
been applied to it. 
In searching for the geological place of this rock, I am satisfied I have found it underlying 
the Palisades in the neighborhood of Fort Lee, where the red sandstone comes out under 
the Palisades very near the water’s edge, and exhibits a great variety of character. Speci 
mens of this rock are in the State Museum. 
10. Clay stone, supposed from the same formation as the last; they are distinctly stratified, 
and have a clay color. They are often quite hard and slaty in structure. Specimens of this 
rock are in the State Museum. 
11. Actynolite, supposed from the anthophyllite locality. This variety has been found in 
boulders at Corlear’s hook, and in other places in the southern part of the island. One of 
three or four feet in diameter was discovered in 1826, near the corner of Monroe and Mont¬ 
gomery streets. I preserved a single specimen, and remember distinctly the character of the 
whole mass ; and on comparing the specimen in my possession with the varieties of antho¬ 
phyllite in place, I doubt not that all the specimens of actynolite on the island have been trans¬ 
ported from this source. 
12. Kyanite. All the specimens of this rock that have come to my knowledge were in loose 
fragments, lying on the surface, inferior in quality. I found two specimens in 1826 near 
Kipp’s bay, but have heard of none more recently, nor have I been able to trace it to its geo¬ 
logical place.”* 
In Westchester county, between Harlem and Westfarms, boulders and blocks of green¬ 
stone like that of the Palisades, granite and gneiss with some mica slate, are thickly strewed 
over the ground in many places. 
Between Kingsbridge and Yonkers or Philipsburgh, boulders of trap are abundant, precisely 
similar to that of the Palisades ; and no other trap is known, in place, east of the Palisades, 
nearer than that of Southbury and New-Haven in Connecticut. About Bedford, Prof. Cassels 
observed many boulders of a granitic porphyry. 
Boulders of serpentine, containing radiating fibres of anthophyllite, were observed in the 
southeast part of Whiteplains ; in the south part of Harrison, and in Mamaroneck. One 
mass was observed near the road from Whiteplains to Mamaroneck, that must weigh sixty to 
one hundred tons. Prof. Cassels nientions a large mass of this rock by the road-side, one 
quarter of a mile east of Westchester court-house in Pineplains, on Mr. Crawford’s farm, and 
which he thinks is in place. Another locality of this rock in place, is reported three or four 
miles south or southeast of Pineplains. I did not see it, but had inferred the existence of this 
rock in place in those parts of Westchester county, by observing the boulders ; and as there 
is but one locality definitely known, namely, that on New-York island described by Prof. L. 
D. Gale; and as boulders in the part of the country under consideration are not known to have 
Geological Report of New-Yoik, 1838, pp. 190, 196. 
