1212 NEW YORK STATE MUSEUM 



the shallower workings along the vein near the Hill quarry 

 and north of the Middle quarry, the same trend of n. 60° to 70° e., 

 and dip of 75° n. w., are maintained with remarkable regularity 

 in the foot wall of the vein. On the other hand, the trend and 

 dip of the hanging wall of this vein are not so constant and 

 they vary greatly in the vicinity of local disturbances of the 

 cement beds. 



Toward the south side of the Middle quarry the Glory Hole 

 vein assumes a flatter position, and at the point U, whicn is 

 near its southernmost outcrop, its dip is 30° n. w. and its strike 

 n. 55° e. 



While at certain points, as at about halfway between the 

 engine house and Hill quarry, shown in the distance of the 

 photograph [pi. 8], the Glory Hole vein is a simple vein about 20 

 feet thick, there are other sections where the vein has been 

 duplicated and even tripled by diagonal strike faults, the planes 

 of which intersect the vein at small angles, generally 10° to 20°. 

 Such diagonal strike faults, which are in all cases thrusts of 

 small displacement with the upthrow or thrust on the north- 

 west side, are best seen at the north end of the Glory Hole cut 

 [pi. 8 and 9], at the Middle quarry [fig. 2, pi. 12], and at 

 the Hill quarry. At one point near the south end of the deeper 

 workings of the Glory Hole vein, such a diagonal fault brings 

 up a wedge of Wilbur limestone, the angular crest of which rises 

 toward the southwest. 



Following the Glory Hole vein through the Middle quarry 

 toward the south end of the Vlightberg, we find that its dip 

 decreases, and that it is split by a diagonal strike thrust fault, 

 with upthrow on the northwest side, into two veins, which 

 south of the Middle quarry give rise to two sharp though small 

 ridges now capped on their northwestern slopes by Wilbur lime- 

 stone, and showing Ohamplainic sandstones on their southeast- 

 ern slopes [see pi. 12, fig. 2, 3, 4]. The right hand ridge, with 

 a strike of n. 55° e., on which is the finely exposed section of the 

 unconformity at locality U [pi. 7], is the continuation of the 

 Glory Hole vein, which has veered somewhat to the southeast 

 and which here has a northwesterly dip of only 30°. The second 



