Geology of apart of Massachusetts, dc. 243 
more nearly on the meridian and the strata themselves 
are nearly in the same line, while by the termination of 
one hill or mountain, and the origin of another farther 
west, and extending farther south than the preceding, the 
inclination of the whole line of hills is more to the west. 
-See plate II. at the end, on which NS is the meridian, 
A, A, A, are separate hills, and the line AA their general 
direction. 
On the west side of the mica-slate and the transition 
limestone, the strata of argillite appear to be still more 
inclined to the west, while the general direction of the 
argillite is paralle] to the range of mica-slate. This is 
represented on the same figure. The dotted space, BB, 
ig the transition limestone, and the lines CC are the ar- 
gillite. The whole is represented from the appearance to 
the eye, as no angles of inclination were attempted to be 
measured. 
The following minerals or their localities, may be sub- 
joined to those published with the geology :— 
Native Alum 
Effioresces on rocks in considerable quantity—-Sheffield. 
It is yellowish, white, and green, and is united with a 
small quantity of sulphate of iron. The rock is mica- 
slate containing aluminous slate. A similar rock, con- 
taining native alum, I have lately found in Pownal, Vt., 
several miles south of the locality already published. 
Spodumene ? 
In small quantity in granite—Chester. By the action 
of the blowpipe it is first converted to scales or plates, 
which then melt into a glass. The mineral is brittle, 
scratches glass, yellowish or pale green. | 
Tron Ore. 
Beds of this ore are found in Hillsdale, N. Y. in the 
same range with that already mentioned in Amenia, N. Y. 
and several miles north of the latter place. 
