of New-York and New-Jersey, &c. 197 * 
tain—I_ found imbedded in the summit rock (generally in 
decaying greenstone,) prehnite, zeolite, analcime, chalcedo- 
ny, agate, amethyst, jasper, crystals of quartz, radiated and 
smoky quartz and narrow veins of satin spar in jasper ; the 
part of this range adjacent to Pompton plains may, perhaps, 
from the abundance of these minerals be useful to the lapi- 
dary as well as the mineralogist—the agates are from the size 
of a pin’s head to three pounds weight, mostly chalcedo- 
ny—the eyed and fortification agate I observed in a few 
instances. I have a mineral specimen from this mountain, 
found and presented to me by Judge Kinsey of Patterson, 
that would probably weigh eight pounds (and is but half of 
the imbedded mass)composed of agate, amethyst, and white 
quartz, in which are observed numerous deep cuniform 
cavities of uniform shape but differing in size—they were 
probably occupied by some of the decaying zeolite ; re- 
mains of lamine, probably of stilbite, are observed in 
some of them: I obtained chalcedony two inches-in thick- 
ness—the amethysts of Paquanack and Patterson display 
the characteristic coloring, are limpid but seldom observed ~ 
in well defined crystals—some of the agates display a rich 
variety of coloring. Bo ik : 
Another greenstone range of minor extent is situated in 
the great valley, the subject of examination ;—it rises near 
Chatham, extends ten miles, and is called Long-hill. The 
greenstone of this ridge is so subject to decay that rocks 
seldom appear in place ; prehnite was here noticed. The 
Passaic for several miles, near the base of the mountain, 
pursues a sportive course, and at times concealed in groves, 
then emerging, winds through extensive alluvial meadows. 
About the centre of the Long-hill I observed mural pre- 
cipices composed of what the farmers of New-Jersey call 
shell rock, resembling the stone on the banks of the Rar- 
iton. . 
The secondary of New-Jersey accompanies the High- 
lands to the Delaware. Near the village of Pluckemin and 
South of the Highlands, an elevated greenstone range is 0 
served extending in a western course. Another range passes 
near Princeton towards the Delaware—the greenstone of 
this mountain that came under my observation is both coarse 
and fine, differing little from that of the Bergen ridge. 
Vor. IL.....No. 2. 26 
