88 
AMERICAN GEOLOGY. 
Serpentine, though it can not be regarded in itself as rich 
in ores, yet it is often associated with., or rather in near con- 
tiguity to a great variety of minerals. Chromic iron is one of 
its most constant associates, and occasionally magnetic iron 
traverses it in veins, as at Troy, Yt., and in some parts of 
Europe, it is rich in copper. In St. Lawrence county, N. Y., 
all the beds and veins of specular iron are contiguous to serpen¬ 
tine, and this is the case also with the large rocks of magnetic 
iron in the Adirondack, in Essex county. 
At the well knowrn Parrish mine in St. Lawrence county, N. 
Y., the serpentine is protruded beneath the gneiss and specular 
Fig. 13. 
iron, as represented in fig. 13, thus: a a is a mass of ore, rather 
silicious, b an adit in the mass of ore, c protruded serpentine, 
d gneiss, and e e Potsdam sandstone. The serpentine in this 
instance, seems to have been the rock of eruption which elevated 
and broke up the sandstone. So also in a contiguous vein 
known as the Kearney ore bed, a similar dislocation is known. 
Near Theresa the relations of the rocks are the same, of which 
fig. 15 is a section: a serpentine, b b specular iron ore. In¬ 
stances of the same kind and character might be multiplied. 
Fig. 14. Fig. 14. — Limestone intermixed 
with serpentine, appears in the gneiss 
on the east side of the harbor at 
Whitehall. It has disturbed the su¬ 
perincumbent Potsdam sandstone. 
The facts revealed by the relations of the associated rocks, 
