1214 . NEW YORK STATE MUSEUM 



carried upward toward the southeast to form the hanging wall 

 of the vein along its truncated edge. The amount of displace- 

 ment along this thrust plane has not been determined, as no 

 exploration in search of the missing vein has yet been made. 



The axis of the eastern anticline dips at a low angle to the 

 northeast, as can best be seen in the northerly portion of the 

 Taylor's corner workings. 



The Middle quarry, which is next northeast of the Taylor's 

 corner quarry, shows a structure quite similar to that of the 

 latter, namely an anticlinal arch dipping slightly to the north- 

 east, its wider western limb dipping steeply to the northwest 

 and finally being truncated by an overthrust fault which brings 

 up the Champlainic sandstones into the hanging wall. The 

 eastern limb of the Middle quarry anticlinal is however some- 

 what different from that of the Taylor's corner vein. It is 

 wider, and steeper, and, after having been followed in the quar- 

 rying operations for some distance, perhaps 150 feet, on its 

 southeast dip toward the Glory Hole vein, it was found to curve 

 sharply downward and to diminish in thickness and eventually 

 to dwindle to a knife edge. 



Still farther northeast on the same anticlinal arch are the 

 Level workings, which present essentially the same features in 

 the form of the vein, with the exception that the anticlinal 

 arch has here a small longitudinal trough on its summit just 

 west of its crest. The barren, much contorted zone lying be- 

 tween the eastern limb of this anticlinal and the Glory hole 

 vein is crossed by two or three tunnels or crosscuts, and abun- 

 dant evidence of slipping along northwesterly dipping planes 

 can be found. 



The Spring quarry adjoins the Level workings on the north- 

 east. Here also the anticline appears, but with a slight south- 

 westwardly dipping crest, and with its direction changed 

 toward the left to a strike of n. 42° e. This quarry is just north 

 of the apex of the angle that marks the change in the directrices 

 of the folds of this region, as already referred to on page 1179. 

 The apex falls somewhere between the corner of Delaware 

 avenue and the engine house, and in this small area we find 

 structural features seen nowhere else in this region. 



