METAMORPHIC ROCKS. 485 
The Second range of limestone, a mile or two east of the one we have been describing, 
ranges about parallel, and nearly as great a distance. 
1. The “White mine,” as it is called, is the most southern point at which the limestone 
of this range, as it is supposed, was seen. It is on Anthony’s Nose mountain, about three 
miles east of Fort Montgomery. The limestone is white, highly magnesian, and contains 
some carbonate of iron, and perhaps might without any impropriety be called brown spar. 
It is crystalline and sometimes compact, and contains granular magnetic oxide of iron. It is 
associated with augite and granitic rocks. 
2. Another locality of this rock is about two miles to the north-northeast, near the old post 
road, at a reputed lead and tin mine. The rock is limestone with some serpentine imbedded, 
and contains grains of the magnetic sulphuret of iron. Near this place, where the lead is 
said to have been formed from the ore in the soil by burning brush-heaps, the soil is red, as is 
so commonly the case where the calciferous sandstone has been upturned and partially altered. 
The same limestone is seen still farther to the north-northeast, on the hill, but was not par¬ 
ticularly examined. The same silico-felspathic gneissoid rocks, and pyritous micaceous 
gneiss, as described near the “ Old silver mine,” occur in this vicinity, and the rocks are in 
some places very much confused. 
3. The limestone near Haight’s tavern, is similar to that described above. 
(d). Metamorphic rocks of Washington county. 
The metamorphic limestones of this region are similar in their general characters to those 
described in Warwick and the Highlands, except that brucite and spinelle are rarely found in 
them. It is generally a coarse, white, crystalline limestone, containing various imbedded 
crystalline and amorphous minerals, the most common of which are plumbago, augite and 
hornblende. Hornblende, coccolite and plumbago are the almost constant associates. Scapolite 
is not uncommon. It is very similar to the beds of white granular limestone in Warwick and 
Monroe in Orange county, and I suppose to those of St. Lawrence county, but it does not contain 
the various beautifully crystallized minerals (so far as I have seen) that exist in those rocks. 
In some places the limestone is so much intermixed with other materials found in the gneissoid 
and granitic rocks, that without close examination it would not be suspected as a limestone. 
Quartz is frequently found in it, transparent or translucent, with irregular, rounded forms, as if 
it had been partially melted. Many localities that I have visited show that it has been softened, 
if not melted. The descriptions and diagrams of the limestone in St. Lawrence county by Prof. 
Emmons, leave no doubt that it is an injected rock in some localities, and I have seen examples as 
striking and as demonstrative of this fact in the primary mountain region of Washington county. 
There is a locality to be seen on the road between Mount Hope furnace and the iron mines 
south, that will leave little doubt of the rock having been injected in a fluid state. 
In another locality about one or one and a half miles from Fort-Ann to Whitehall, a cliff 
of the white limestone is exposed on the road-side, and a mass of stratified hornblendic gneiss 
is distinctly seen imbedded in it. This last example is adduced, not so much for evidence on 
