J. D. Dana— Geology of Vermont and Berkshire. 41 
(1) Jnterstratified limestone and schists.* 
Fig. 1 represents a very common case of this first kind. 
Chloritic hydromica slate, dipping eastward, lies between strata 
of limestone which have the same dip. Examples occur in 
the southern third of the ridge called Tom Ball, southwest of 
Van Deusenville; also in Alvord, west of Tom Ball; in West 
Stockbridge; along much of the Taconic range, the slates 
2. 
TEGAN \ 
i 
Pp 
small. At the north end of Tom Ball the position of the rocks 
1S aS represented in fig. 8, in which on the east the limestone 
dips west 18° to 20° under the chloritic hydromica slate, con- 
taining in some places many garnets, and passing also into 
mica slate. The schist overlies the limestone in a synclinal. 
ist of the north end of Tom Ball, on the road to Glendale, 
the limestone dips eastward 25° under a bluff of garnetiferous 
mica schist (fig. 4). 
The facts connected with Graylock, in Northwestern Massa- 
chusetts, the highest of the Taconic peaks, point to a synclinal 
(or a synclinal with subordinate anticlinals and synclinals), 
grec the figures the blocked areas ee gy sho mentg the simply lined, 
eastward end. the lined and dotted, quartzyte. Moreover, the right end is the 
a 
