200 



M e !tre£ d angular. Vertical cleavage is strongly devel- 

 oped in the quartzite, the slipping along the 

 cleavage plane having produced the corrugations, 

 the slate besides being cleaved shows a 

 sympathetic folding with the corrugations of 

 the veins; the corrugations pitch eastward in 

 the same direction as the pitch of the anticline. 

 From Black brook eastward the pitch of the 

 anticline increases gradually to 45 , the fold 

 becomes broader and the strata describe large 

 and almost concentric curves. Several faults 

 radiate toward the east and southeast, the 

 largest one following approximately the anti- 

 clinal axis. 



Going easterly from Black brook over the 

 hill in the direction of the anticline the follow- 

 ing observations may be made. 

 4,790 ft. At the top of the hill, on the south limb, the 



1 ,460 m. Carpenter lead curves in the shape of an S in a 

 subordinate crumple of the strata, 14 feet wide , 

 pitching east about 30 ; the crumpled part of 

 the lead is enriched and enlarged from 3 inches 

 to 24 inches by angulars entering from below 

 and forming a rich ore -shoot which was worked 

 out to the depth of 200 feet (60 m.). The ad- 

 joining strata are conformably crumpled. 



Farther east, the Galena, Boston-Oldham and 

 other leads are crossed in open-cuts on the 

 north limb of the fold where they curve to the 

 anticlinal fault, on the south side of which 

 they have not been identified. 

 5,840 ft. On the Sterling Barrel lead, a rich ore-shoot 



1,790 m. has been worked to a depth of 1,610 feet (487 

 m.) by an inclined shaft on a dip increasing from 

 30 at the surface to 43 ° at a vertical depth of 

 about 900 feet (275 m.) ; the ore-shoot occurs 

 immediately south of the anticlinal fault, where 

 the strata form a pronounced bulge or undula- 

 tion of small horizontal width, but of great 

 extent in depth; the structure and character of 

 the shoot was very regular from the surface to 

 the bottom of the workings, its horizontal length 

 varying from 100 to 150 feet (30 to 45 m.). 

 The vein is corrugated, lies on the lower side of 



