174 GREEN MOUNTAINS IN MASSACHUSETTS. 



Section N, PI. xxn, begins at Cheshire and shows a Bynclinc in the schist uorth 

 of the Farnham's quarry limestone area. This syncline appears to be continuous with 

 that of Sections K and L, and is also on the line of the Bagged mountain .syncline. 

 North of the Lanesboro 1 limestone area there are indications of an anticline in the 

 schist; and between this and the syncline on the east the numerous easterly dips are 

 interpreted as indicating a compressed fold, inclined westward, between the central 

 syncline and the eastern one. Between East mountain and the central Greylock ridge, 

 in the western part of the section, minor undulations yield alternating areas of schist 

 and limestone as on Section M. Both this and the following section indicate an 

 increasing compression, the folds becoming more numerous, relatively to the distance, 

 less open and more inclined than on Section L. 



Section 0, PI. xxn, starting from Cheshire reservoir, crosses the Farnham's 

 quarry limestone area. At the east foot of the high schist ridge, which presents its 

 precipitous side to the Hoosic valley (compare PI. XV 

 with this section), the limestone evidently dips under 

 the schist. At the south end and east side of this ridge 

 the schist has a high westerly cleavage, and very low 

 westerly or horizontal plications (localities 315, 427, 325 £), 

 together with a northerly pitch (locality 325). Toward 

 the limestone on the west the westerly dip appears still 

 „„„„,, ,., ., to continue (localities 325,410,411). The structure at 



Fig. 70.— Structure in schist on the 



nun, west of Cheshire reserroir. locality 315 is represented approximately in Fig. 70; that 



at locality 325 in Fig. 59, p. 156. 



From the syncline uorth of the Farnham's quarry limestone area (Section N), from 

 the northerly pitch south of it on Savage mountain, from the westerly dip in the 

 schist east of that area, and the easterly dip of the same rock west of it (Section O), 

 from the character of the dips in the limestone itself, as well as from the isolation of 

 this limestone from that of the Hoosic valley, it has been inferred that a schist syn 

 dine underlies the Farnham's quarry limestone, and, therefore, that, although litho- 

 logically identical with the lower limestone, it belongs stratigraphically with the up- 

 per. We have here, apparently, a small limestone basin similar in structure and position 

 to the larger one which surrounds and underlies Bagged mountain. The difference in 

 the limestone of these two areas is mainly in degree of metamorphism. But in several 

 places the limestone of Hoosic valley resembles that of the Notch. About halt a mile 

 SSW of the west end of this section (C),at the east foot of I'.ast mountain (locality 749, 

 back of Mr. Pine's house), the schist apparently dips east, as does also the lime 

 stone. No plications are discernible. If this be the correct dip it indicates an over 

 turn, the dips corresponding to those on the east side of Potter m'ountaiu (locality 

 984) and <>u the road from Pittstield to Lebanon (locality 1020). 



Wffllttl 



Quarf7 lamina 

 Stratif 



3. Ft 

 Cleavage dip 75°w. • 



