in the vicinity of Great Barrington, Mass. 85 
tact of the limestone and quartzite tells us nothing as to 
whether the quartzite conforms to the limestone in dip, or 
whether the two are separated by a fault. But this question is 
settled positively by the ewistence of a laminated bed of quartzose 
limestone, or caleareous quartzite, 40 to 50 feet thick, i 
quartzite itself, as exhibited in the section (fig. 6). The lamina- 
tion of this calcareous stratum is very perfect and uniform, 
and extends for a long distance along the west slope of the 
ridge, Its strike is N. 5° E., and its dip 70°-75° to the east- 
V3 AB 
Section from Glendale westward, through north end of Tom Ball. 
3. 
: Ww Baal 2 er 
Section from Monument Mountain westward, through middle of Tom Ball. 
sencessueeseceanesesraneetaeneneneaneeer 
aennanerscancasetenannne, gene 
H 
Alluvial plain S. of Mon. Mt. 
Section across Long Pond valley through southern half of Tom Ball. 
ward. The impure limestone or calcareous quartzite contains 
occasionally minute, slender, brown tourmalines, some of them 
half an. rae long. e stratum is se arated from the limestone 
on the west by about forty feet of the hard bedless quartzite, 
the part of the quartzite that corresponds in thickness with the 
lower gneiss in the Monument Mountain section (figs. 3 or 4) 
the exact amount cannot be determined on account © 
absence of bedding. 
