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AMERICAN GEOLOGY. 
districts or fields of serpentine differ from that which belongs 
to the Green or Hoosick Mountain and Allegany ranges. Py- 
roxenenas, amphiboles and graphite, are common to the former, 
but very rare in the latter; that is if they occur in proximity, 
they belong rather to other rocks, and not to the serpentine. 
The silicious minerals, as chalcedony, chrysoprase and agates, 
are associated with the former ranges, to which may be added 
from the magnesian minerals, schiller spar. In Maine, Dr. 
Jackson mentions only one locality of serpentine, that of Deer 
V island, which seems to have been erupted through granite. 
This mass may be connected with that of the Grand Menan, 
on the northern coast of Maine and Nova Scotia. 
Serpentine is extensively developed in Pennsylvania, Virginia, 
and Maryland. I may cite the serpentine rock of the Pine Bar¬ 
ren range. It extends from East Nottingham into Maryland, 
after crossing the Northeast creek. It contains chrome ore. It 
belongs to the Chester and Lancaster county belt. It contains 
also silicate of magnesia, a mineral which is worth some three 
or four dollars per ton. This belt continues onward west by 
south into Harford county, Maryland, crossing the Susquehanna 
near Fraser’s Point. The belt is prolonged to the southwest, 
embracing the Bare hills near Baltimore. Its continuity is 
interrupted in many places, still the belt extends through Penn¬ 
sylvania into New Jersey in the direction of Easton, North¬ 
ampton county. It is rather remarkable that serpentine, though 
it forms by itself hills of a moderate elevation, yet does not 
appear in the higher parts of the Appalachians. It is highly 
chromiferous through Maryland. In North Carolina, in those 
counties which are adjacent to Virginia, it is not so common 
as in the more northern states. It reappears, however, in great 
force in the southwest, particularly in Franklin, Macon, and 
Cherokee counties. The same belt extends into Georgia. Of 
this rock, then, it may be said to extend from Canada to 
Georgia in a belt which skirts the eastern base of the Hoosick 
and Appalachian chains. In the Appalachians its direction is 
nearly northeast and southwest; in the Hoosick range nearly 
