METAMORPHIC ROCKS. 479i 
is white, and contains brucite and spinelle ; but much of it is of a flesh-red color, and contains 
grains of white scapolite, green phosphate of lime, and hornblende and some mica. 
About two miles farther up the stream to the west-southwest, the iron ore was again seen, and 
near it the red granular crystallized limestone associated with beautiful massive and laminated 
scapolite, more beautiful than any I have seen from other places. Crystallized augite and 
sahlite in fine terminated crystals, also occur there. The position of the rocks at the Forest 
of Dean mine, are represented, as far as observed, on Pla1|P 5, fig. 9. The red limestone is 
found farther to the north-northeast, at several localities between the Forest of Dean and 
Round pond. 
A few rods southwest of Round pond, four and a half miles southwest of the West-Point 
Military Academy, is a locality of the limestone under consideration. It is now perhaps 
scarcely exposed to view, being mostly covered by soil. It was finely exposed some years 
ago, by the earth caving down into a cavern in the limestone. Lieut. Prescott and others had 
the earth and rock dug out to expose the opening into the cave, which has already been de¬ 
scribed on pp. 36, 110 of this volume. The limestone is white and flesh-red, and contains 
brucite (sometimes in imperfect crystals), small but brilliant crystals of black spinelle, hexago¬ 
nal crystals of mica, augite, hornblende, and phosphate of lime. The same kind of limestone 
but far more impure, may be seen at the Bear Hole, a short distance farther southwest, about 
a quarter of a mile from the Round pond ; but it is so mixed with other minerals at this place, 
as to be scarcely recognized as a limestone without close examination. The surface is warty 
and uneven, from the enclosed minerals projecting beyond the general surface of the rock. 
This is due to the action of the weather, removing the carbonate of lime more rapidly than 
the enclosed minerals. Granite and gneiss are the associated rocks. Hornblendic and augitic 
rocks are common in the vicinity. 
The locality on the northeast corner of Bog meadow, or Reservoir pond, a mile northeast of 
the preceding, I found in 1825, when exploring those wild mountains. A fine spring issues 
from the base of the rock. The limestone is a beautiful flesh-red, very coarsely crystalline, 
so that large rhombic crystals can be obtained by cleavage, and richer in color than the red 
limestone of this character from any of the other localities from which specimens have been 
obtained. It contains, in some parts, dark green imbedded grains of augite or hornblende. 
Adularia and glassy felspar are common in the granite rocks of the vicinity. The locality 
is not at the northeast corner of the pond, but at the northeast extremity of a small bay of 
the pond on the east side. 
Many localities of the white and red limestone containing brucite and spinelle, were examined 
in Monroe, associated with quartzose gneiss, micaceous gneiss, felspathic granite, augite 
and hornblende rocks ; but I will describe only one more, which is somewhat remarkable in 
consequence of the limestone being traversed by dykes and interlamindtions of greenstone, 
and the lateral heaves or faults to which the rocks have been subjected. The position of the 
rocks was intended to be represented on Plate 5, fig. 11. One portion represents the topography 
around the locality, which is about a quarter of a- mile southeast of the southern extremity of 
