Liquivalence and Age of the Formations. 205 
Bluff and Three-mile Ridge, which face one another on oppo- 
site sides of the valley, are here repeated from page 45 of this 
volume. In each of the sections, quartzyte strata and over- 
lying schists of great thickness rest on the limestone which 
outcrops in the valley. The dip is small (8°-25°, p. 46).- 
The limestone is plainly at the bottom; and 2 és strategraphi- 
cally so, unless there has been a flexing of the strata and an 
overturned fold at the place. Nothing in the region suggests 
that there has been such an overthrow: the facts, on the con- 
trary, prove the flexure which the strata have undergone to be 
a gentle one. As has been stated, the two ridges stand oppo- 
site one another, not quite a mile apart. In the eastern, the 
dip is 20°-25° to the northeastward; in the western, about the 
same to the northwestward. The series of rocks from below 
upward, limestone, quartzyte, schist, of one side, is repeated in 
the other, and the schist of the west side has a thickness of 
several hundred feet like that of the east. All the conditions 
are those of a low anticlinal spanning the valley; and one 
Whose axis dips gettly northward, and whose sides flare south- 
ward or southward and eastward. The valley south of Devany’s 
Bluff widens much to the eastward and has its lakes with lime- 
stone about tliem. 
Besides this, the rocks of the gentle anticlinal are continued in 
the high land either side in a broad shallow synclinal—the high 
land synclinals and the anticlinal valley between covering a 
breadth from east to west of ten miles. (a) In the synclinal to the 
west (between the Konkaput valley and Great Barrington), the 
schist has first a dip northwestward of 8° to 25°, but, after three- 
fourths of a mile, the dip is eastward 20° to 25°, and finally 40° 
to 50°, just east of Great Barrington. () In that to the east, 
the dip is 5° to 25° to the northeastward, over the high land an 
mountainous region all the way east from Devany’s bluff to the 
village of Monterey ; but on the northeastern side of this high 
land, at the village of Tyringham, and at South Lee, it is to the 
southwestward. A section between Monterey and Tyringham, 
east of north in course, shows the change of dip. The limestone 
about Monterey dips 25° to the northwest; along the highest 
part of the road, the gneiss and mica schist of the hills outcrop 
and have the same dip and strike; descending to Tyringham, 
five miles to the north, the dip diminishes, and for the last mile 
of °c and mica schist, with a dip of 15° to 25°. 
