MOUNT GREYLOCK. 171 



Saddle mountain, localities 619, 621,) are construed as indicating a structure similar to 

 that on Section <! on the same mountain, but more compressed. The presence of au 

 area of level arable land measuring about 1,000 feet squan — "Wilbur's pasture" — at 

 an altitude of 2,200 feet above sea level between the schist masses of Symouds peak 

 on the west and of Mount Williams on the east, fonniug the saddle of this Saddle 

 mountain, and corresponding, as it does, to the similar area. "Shattuck flats,'' about 

 2i miles south, between Bald mountain ami the central crest, at an altitude of 2,500 

 feet, and also to the calcareous bench on the western ami southern side of Saddle 

 Ball between the 2,200 and 2,500 feet contours, together with the occurrence of the 

 calcareous belt between Wilbur's pasture and Shattuck Hats in the Hopper ravines, 

 all point to a structural if not to a lithologic similarity. (See PI. xvn.) 



Section F, PI. xix, is confined to Ragged mountain. The syncline aud anticline 

 observed about the limestone quarries between Zylonite (Howlauds) aud Renfrew, on 

 the mountain side, appear here. The lower schists measure 

 only about 1,000 feet ou the east side of Ragged mountain 

 at this point. In the centre of the Notch, locality o'32, 

 highly contorted strata of a (eldspathic quartzite with a 

 low southerly pitch occur. The occurrence of a similar Fiq. 66.— Cross-section F. 

 rock is so frequent in this belt that it may be said in part to characterize the 

 horizon. 1 



Section J, PI. xxi, south of Section 1, from a point a quarter of a mile south of Maple 

 Grove station (South Adams), crosses a lens-shaped compressed syncline of the lower 

 schist, which is here very graphitic, as it is frequently near the lower limestone. 

 At the contact, on the east side, the schist seems to inclose large lenticular blocks of 

 the underlying limestone. West of the main belt of the lower schist is an area, nearly 

 2,000 feet wide, of a rock resembling the feldspathic quartzite of the Notch, referred 

 to under Section F, but so micaceous as to constitute a fine-grained gueiss. 2 The 

 strata dip west, and appear to overlie the adjoining schists. For these reasons this 

 area has been considered as forming part of the upper limestone belt. The observa- 

 tions at the west end of this section in Goodell hollow on the south side of Bald moun- 

 tain have already been referred to under Section 1. Dip observations taken at 

 different elevations indicate that the folds become more acute in the lower as well as 

 the higher parts of the mass. 



Sections K, L, PI. xxi, commence north and south of Cheshire harbor. The schist 

 mass east of Cheshire harbor on Section Iv, which sends out a tongue southwards, 

 crossed also by Sections L and M, is that represented in Emmons's section as under- 

 lying the floosie valley limestone, and corresponding to the schist of Sawmill hi! 1 

 near Sweet's corners. Put observations made by other members of this division of 

 the geological survey along the base of Hoosac mountain show that this schist mass 



Mi. Wolff's determinations of this rook are given ou p. 185 (localitj 345). 

 '-' Seo p. 186, specimen from locality 616. 



