APPENDIX B. 



in anticline of Stockbridge 

 :h the Berkshire schist at 



Height, 8 teet. Southern 



NEW ASHFORD. 



Their is an area of between 3 and 1 square miles south and east of the village of 

 New Ashl'onl, within which nearly all the structural aud area! features that char- 

 acterize the Greylock mass are repeated ou a 

 small scale and within easy reach. PI. i shows 

 the geology of this tract. Section M traverses 

 it. Fig. 74 gives a, view of the greater portion 

 of it and of Sugarloaf mountain winch covers 

 a large part of the area, This little schist 

 mountain, the synclinal structure of which 

 has already been alluded to, is entirely sur- 

 rounded as well as underlain by limestone. 

 It forms a conspicuous object, in the land 

 scape, views of it from the north (Fig. 30) and fi«. 77.-A P ex of the m> 



v ^ ' limestone protruding throu 



the south (PI. XV) showing the depression OU Quarry hill, tfew Ashford. 



.,, . , .... ,. side. Se.' locality 296. Fig. 7s. 



either side of it corresponding to the limestone. 



A line of cliffs, masked, however, by foliage, traverses its south end from east 



to west, rising above the limestone which pitches under it, Ou the west side of 

 Sugarloaf the synclinal structure is concealed in most of 

 the limestone out-crops by cleavage foliation. (See Fig. 37.) 

 A northerly pitch is well observed at the south end in some 

 of the minor folds (see Pig. 60), as well as a southerly pitch 

 in the schist at the north end. Section R", which follows 

 the synclinal axis of Sugarloaf, shows the trough structure 

 of that mountain. Another trough exists in the schist mass 

 south of it. 



Several isolated schist masses cap the limestone folds 

 along the foot of the mountain on the south. The phenomena 



of cleavage and stratification in one of these have been shown in Fig. 35. 



<)n Quarry hill the converse of the structure presented by Sugarloaf mountain 



appears. A limestone anticline with subordinate folds protrudes through the schist. 

 202 



FIG. 78.— Geologic map of 

 Quarry hill. Ne\y Ash ford. 



