Dewey on Geology of Williamstoion, ^rc. 343 



(Steel. In some cases it is earthy. On Green River, one and 

 a half mile 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 

 a vein 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 

 county. It may still be primitive, but primitive compact limC' 

 stone. 



10. Granitell 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 

 Qiiles south of the college. 



