KOCK STRUCTURE. 27 
• f the axes shows itself in surface features is seen in PI. VI, A. The 
lartzite of the Green Mountain Range south of the Vermont-Massa- 
jiusetts line and between North Adams and Williamstown is in minor 
lesterly dipping folds, which pitch south to pass under the limestone 
ff the Hoosic Valley. This pitch has much to do with the length of 
Ae isolated schist and limestone areas. By comparing Section .1 with 
le map it Avill be observed that the eastern syncline of Greylock is 
jli line with the synclinal Stamford Valley, while the rest of that 
Irclinorium is in line with the complex anticline of the Green Moun- 
iin Range, the western side of which is represented in PL VI, A. 
fount Equinox, in Manchester, although a part of the Taconic 
Imclinorium, is a gentle anticline, and the westerly facing schist cliff 
f Pond Mountain in Wells is the western limb of an anticline over- 
Irned to the west (PL V, B.) a 
| In the slate and shale region west of the Taconic Range the folds 
re frequently close and small. Some of the hill masses there seem 
|1> be anticlines of the underlying older formation (e. g., the one in 
Jlebron) ; others are synclines of the overlying one (e. g., Hatch Hill 
|i Whitehall, Mount Colfax in Jackson, and Mount Rafinesque in 
Brunswick). 
The courses of the axes of the major folds in the Taconic Range 
[(here well determined are indicated on the map by long arrows. At 
lie south, in Mommient Mountain, the direction is north-northwest; 
Ik the Greylock mass, north-northeast; in Mount Anthony, north; 
■Count Equinox, north-northeast ; Bird Mountain, almost northeast ; 
| it from West Rutland on it is again north-northwest, as in Monu- 
ment Mountain, 100 miles south. The structural axis of the Green 
Mountain Range is shown at several points. Exceptionally the 
pes diverge for short distances from the course of the ranges. This 
| due either to transverse folding (e. g., Hoosac Mountain and Mount 
Lnthony) or to the exposure by denudation of folds due to a crustal 
liovement prior to the last one which affected the region (e. g., the 
forth end of the Taconic Range). 6 
The cause of the divergence in the axis of the Green Mountain 
Ineiss east of Bennington is not determined. c 
Secondary structures. — Secondary structures affect the entire 
legion. A slip cleavage, dipping almost uniformly east, marks the 
lehist of the Taconic Range, and the slaty cleavage which character- 
fees a large part of the belt west has a like direction of inclination. 
| " See Miss F. Bascom's section in Nineteenth Ann. Rept. U. S. Geol. Survey, pt. 3, 
899, p. 197. 
6 See Am. Jour. Sci., 4th ser., vol. 17, 1904, p. 185, pi. xi. 
« See Bull. U. S. Geol. Survey No. 195, 1902, p. 18. 
Bull. 272—05 m 3 
