8 00 THE JOURNAL OF GEOLOGY. 



not been measured. The former probably has a thickness of much 

 less than a thousand feet. A locality where the Canaan Dolomite 

 appears below it in the core of a fold, is shown in Plate VII., 



Fig- 3- 



Conclusions. — Some of the results of this study may be sum- 

 med up in the following statements : 



I. The district is geologically closely connected with Mt. 

 Washington, and contains the same horizons, viz : Canaan Dolo- 

 mite, Riga Schist, Egremont Limestone, and Everett Schist. 

 For the most part the same general lithological features charac- 

 terize these horizons as on Mt. Washington. Pyroxene is a charac- 

 teristic mineral in the lower but absent from the upper calcareous 

 member. Garnets and staurolites are abundant in the lower but 

 absent from the upper schist member. Locally important beds 

 of calcareous schist occur in the Egremont Limestone. The 

 Everett Schist differs from much of that of Mt. Washington in 

 being essentially non-chloritic. The Egremont Limestone has a 

 thickness of less than ioo feet in the southern part of the area. 



II. The tongue-like outline of the area containing schist 

 exposures is due to a general northerly pitch of the flexures to 

 the west of the Housatonic River, though the local pitch of these 

 flexures varies greatly and is as often south as north. Most of 

 the prominent ridges are anticlinals of the Riga Schist, the few 

 areas of Everett Schist being synclinals and largest where basins 

 are formed by a coincidence of longitudinal and transverse syn- 

 clinals. The schist areas exhibit an arrangement in four 1 east 

 and west belts having each a width of about two miles, as the 

 result of four marked undulations in the crest lines of the flex- 

 ures. Particularly toward the north these belts are further sub- 

 divided by a secondary series of undulations a half mile or more 

 in width, and a tertiary series of yet smaller waves can in some 

 cases be made out at localities. These facts show that the area 

 has been subjected to compression in a north and south direction, 



*(i) Bear's Den, Barnard Mt., and Johnny's Mt.; (2) Horse Hill, Peck's Hill, 

 etc.; (3) Northern Chapinville area, Tom's Hill, and Miles Hill ; (4) Southern Cha- 

 pinville area, and area No. 6. 



