QUARTZYTES AND SANDSTONES. 53 



thered to a drab-colored rock on their outcropping edges. The 

 waste, consisting of some top-dirt and the shaly strata, is thrown into 

 the river on the front, making room for dockage ; and the stone is 

 shipped by boat to its destination. The principal use of this stone 

 has been for dock-filling and for dykes on the upper part of the 

 Hudson river. About twenty men are employed in the aggregate 

 by these quarries. Formerly the business was much larger and many 

 men were employed. 



The first quarry south of the village is owned by A. V. S. Van- 

 derpool. It is less than a half a mile south of it. The quarry face 

 runs from north-north- east to south-south-west for 100 yards, and is 

 worked back a distance of 25 yards. The present quarry work 

 is in the line of strike, south 30° west. The beds are vertical, 

 excepting at the top, where they are bent over to the east, an 

 inclination apparently the result of glacial forces. A prominent 

 joint system has its plane dipping 30° to the north-east. The quarry 

 face has an extreme height of 100 feet at the south-west, and is 50 

 feet high at the north. The earth covering on the top is thin. The 

 workable beds are dark drab-colored to blue, and are from six inches 

 to eight feet thick. They are interstratified with a fissile, black 

 slate, which varies in its layers from two inches to six inches in thick- 

 ness. There are two thick beds of stone — one of eight feet, near 

 the middle and the other three feet thick, at the back, or west. At 

 the south-east corner of the quarry the beds have been disturbed by 

 folding ; and there the stone is harder than elsewhere in the quarry. 

 The joint planes of division help in the quarrying, and the stone is 

 rather readily broken into rectangular blocks of convenient size and 

 shape. The quarry has a dock at river|front, at which large vessels 

 can load. It has been opened about 30 years. 



Another opening on the same property is nearly 100 yards south of 

 this one. It is not now in operation as a quarry. The beds in it 

 dip 70° to the west-north-west. 



Andrew Matthews' quarry is nearly one mile south of the village. 

 Its dimensions are, approximately, 80 yards in length and 30 yards 

 in width, and having a height of 50 feet at the back. The strata 

 stand vertically. A remarkable fault (here termed a slip-foot) is seen 

 at the west side. Its plane dips 30° eastward, and on the top section, 

 looking ^southward, the strata are folded closely, with upper part of 

 the synclinal cut off ; on the bottom and below the faulting plane the 

 beds dip eastward at an angle of 30°, conformably to the plane. The 



