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also exhibited specimens of crystallized garnets of good color 
and clear, from Hanover, N. H., where they occur in an ir- 
regular vein in syenitic gneiss. 
Pror. D. S. MARTIN read a paper on the Coal of Orange Co., 
N. Y., in which he gave some account of the coal mine re- 
cently reported as discovered at Munroe, N. Y. 
The Triassic formation is bounded on the north-west by a 
range of metamorphic hills, which forms part of the great 
Appalachian system, reaching up from the blue mountains of 
Pennsylvania, and striking the Hudson river at Peekskill, 
where it forms the Hudson Highlands. On the opposite, or 
western side of this ridge, are found successive ranges of 
Palzeozoic beds, of which the age isin dispute. The coal- 
mine of Munroe, lies upon the western side, near the summit 
of an isolated hill known as Schunemunk mountain, just 
beyond this principal range of metamorphic heights, and over- 
looking the broad Wallkill valley, westward to the hills back 
of Port Jervis, which run into Catskills. Here an excavation 
has been made into the rock, which is a dark grey argilla- 
ceous sandstone, indistinguishable from the ordinary 
“ Hamilton flags.” Much of itis black with carbonaceous 
matter, but very little coal has yet. been found, though the 
workings have been carried on for some months. The point 
of greatest interest, however, is the determination of the age 
of the rock, from its fossils. These are for the most part 
obscure, being apparently mingled with the debris of a frag- 
mental deposit; but enough has been obtained to fix the age 
as Devonian, and probably of the Hamilton Group. The 
forms are Lepidodendron (probably L. Gaspeanum,) Calamites, 
Psilophyton, and Dr. Newberry thinks, Dadoxylon. 
The prospect of obtaining workable amounts of coal is not 
by any means flattering ; but the scientific results are of much 
interest. Prof Cook in his recent report on the Geology of 
New Jersey, has considered this district to be lower silurian, 
on the theory that the series ascends regularly, in going west- 
ward from the Highland range. But it isnow seen that Prof. 
Mather was nearer the truth, in his conception, that the 
