* * 
Dewey on Geology of Williamstown, $e. 343 
steel. It some cases it is earthy. On Green River, one and 
a half miles south of the college, it lies in thin strata, which are 
divided by seams into very regular rhomboidal plates of va- 
rious sizes. On some scattered fragments on this river, are 
found carbonate of lime in crystals, with pieces of white feld- 
spar. On West Brook, this gray limestone is traversed by a 
vein of quartz, containing sulphuret of iron. The strata of 
this rock are almost invariably inclined to the east. A coarse 
soapstone is found in the limestone near the college, and 
avein made up of brown argillaceous slate, soapstone, quartz, 
and sulphuret of iron, passes through it. This limestone ap- 
pears to be very different from that at the base of Saddle 
Mountain, and from that which yields the marble of Berkshire 
country. It may still be primitive, but primitive compact lime- 
stone. 
10. Granitelle of Kirwan, Quartz, and Feldspar. ‘This aggre- 
gate forms extensive strata at the east base of Stone Hill. The 
feldspar is diffused in grains through the quartz, and sometimes 
crystalline, forming porphyritic quartz. This aggregate is often 
compact and very hard, but frequently it is porous and hard, 
forming good millstones. Sometimes the quartz appears in 
such fragments, that the stone resembles breccia. 
11. Black Tourmaline. In beautiful small six-sided prisms, 
in scattered pieces of mica slate at the base of Stone Hill. 
12. Amianthus. Only a small specimen, attached to argilla- 
Ceous slate. : 
13. Bitter spar, On compact limestone at West Brook. 
Some of the crystals are rhomboids, and some appear to be 
the half of rhomboids split through their longer diagonal. 
14. Jasper. The common brown or red, and black, in small 
rounded masses, and also a piece of variegated or striped jas- 
‘per. . 
15. Galena. Only a specimen in the limestone on West 
Brook. 
16. Iron Ore. Bog ore on the Hoosack, a mile northeast of 
the college. Yellow earth, from which yellow ochre is obtained 
in great quantity, in a hill (R) on the bank of Green River, 2 
miles south of the college. 
