in the vicinity of Great Barrington, Mass. 278 
upper layer was covered above with a coating of quartzite, con- 
ing the conclusion that the quartzite is the superior rock, 
It will be observed that the variations from hard to softer 
quartzite, and from quartzite to metamorphic schists, are simi- 
lar to those observed in Berkshire. East of Brandon, a mile 
or two beyond the limonite, lignite and kaolin bed of “ Forest- 
dale,” I visited another part of this Vermont quartzite range. 
There the rock is of the hard jointed kind. But the bedding 
is in some places distinct, and in a few layers there are slaty 
portions. 
Graylock.—Graylock, standing between South Adams and 
Williamstown, in Northwestern Massachusetts, 3600 feet above 
tide level, while Taconic in system and in the character of its 
rocks, belongs to a parallel line of elevations about six miles 
east of the Taconic Ridge. In structure and origin it is closely 
like Mt. Washington. ‘This is shown as far as relates to the 
existence of the synclinal, in the section of it published by 
Prof. Emmons, at page 19 of his American Geology (8vo, 1858), 
the general truth of which I have verified. 
is section commences at South Adams, and terminates 
at the entrance to the great funnel-shaped valley called the 
Hopper, where the limestone stratum dips eastward under the 
mountain. The dip of the slates at the summit of Graylock 
*The Geologi uartzite east of Brandon to 
ogical Report of Vermont makes the q : 
‘xtend west over wa calles of country which is without outc ay ape roe 
7 to the bed of limonite and kaolin at “ Forestdale. But the kao: 
| it is 
aes or hydromica underli 
its feldspar was the origin of the kaolin. 
AM. Jour. Sc.—Turep Serizs, Vou. VI, No. 34.—Oct., 1873. 
18 
