in the vicinity of Great Barrington, Mass. 259 
by steeply-dipping limestone ; the low ridge on the left (west) 
consists of mica schist (and gneiss) with some intercalated 
quartzite (q), and, on the west side as well as at top, of the 
pass now to the region east of Great Barrington. _ 
he ridge begun in East Mountain (at the east or right ee 
of the preceding section, fig. 10) continues for three miles ot 
partial interruption at one place), to Muddy Brook Valley, 
Where stands “'Three-mile Ridge” as its terminus. is singe 
mile Ridge is in the same line with Monument Mountain an 
