342 Dewey on Geology of Williamstown, é-c. 
coarse-grained and white limestone is found, resting on the 
mica slate atthe west of it. 
At the north and west base of Saddle Mountain, (E) and at 
a lesselevation than the quartz, are extensive strata of lime- 
stone inclining the same way as the mica slate of the mountain. 
At is less distinctly granular, and less white than the other, but 
belongs to the same rock. It forms tolerably good marble. 
Between the strata are crystals of carbonate of lime, rhomboi- 
dal, and tending to the lenticular form. Some of these strata 
appear to be composed of blended crystals of this kind. In 
one place are strata of several rods in length and breadth, 
) which are inclined to the southwest, and thus lie against the 
mica slate of the mountain. The inclination is about forty-five 
degrees. Unless this limestone be connected with that on the 
east of Saddle Mountain, (and no connexion has yet been tra- 
ced,) it must be considered as lying on both sides of the mica 
slate, or alternating with it. 
"5. Argillaceous Slate rests on quartz on Stone Hill, and is also 
found low down in the valley connected with limestone. It 
constitutes the hill (P) connected with the T'aconick range, 
and also Northwest hill, (Q) whose base is compact limestone. 
A few miles north, this slate is distinctly marked, and in about 
12 miles, forms hills of roof slate in Hoosack, New-York. It is 
annually carried in large quantities to Albany. On the first 
mentioned hill, it contains some talc. 
6. Aluminous slate. This is found in argillaceous slate, in 
Pownal, 5 miles north, at the base of a hill east of the Hoo- 
sack. It is used to set colors. 
7. Chlorite. In rounded masses, generally with quartz, 
scattered through the valley in Williamstown, and found at an 
elevation of some hundred feet on the hills of the ‘Taconick 
range. Chlorite slate has already been mentioned as occur- 
ring on the same range. 
8. Rubble Stone. In rounded masses through the valley. 
9. Compact Limestone. In several places low in the valley- 
Near the college it is white and deep gray. In the veins of 
the latter, tale is diffused in all directions. It contains silex, 
often from 3 to 15 per cent, and sometimes gives fire with 
