QUARTZYTES AND SANDSTONES. 45 



n-SUB-CBYSTALLINE AND FKAGMENTAL EOOKS. 



GROUP OF QUARTZYTE AND SANDSTONE. 



Potsdam Sandstone. 



Fort Ann, Washington County. — Jenkins White's quarry. The 

 Potsdam sandstone is quarried at the side of the canal in a low bluff 

 about two miles north of Fort Ann, and in the town of Fort Ann, 

 Washington county. The working has opened the rock for over 

 100 yards in length, and the quarry face is at least 20 feet high. The 

 beds have a gentle eastward dip and are traversed by vertical 

 joints. The stone is grayish-white in color, hard and so close-grained 

 as to resemble a quartzyte. The stone is used for building at White- 

 hall, and is shipped by canal. 



Whitehall, Washington County. — There is a fine section of 

 the Potsdam sandstone to be seen in the cliff east of this town. The 

 edges of the strata form an almost vertical rise of 100 feet. The 

 stone is quarried out for common masonry, as foundations, retain- 

 ing walls, etc., and is a cheap and valuable building material for 

 such purpose. It is hard and strong. Its use is limited to the town. 



Port Henry, Essex County. — The Potsdam sandstone crops out 

 at the side of the railroad, north of the railroad station, and in the 

 hillside west of the town. These outcropping ledges have fur- 

 nished stone for common walls and ordinary building purposes. The 

 principal quarrying operations are on the hill, west of the town, and a 

 quarter of a mile west of the Delaware and Hudson railroad line, 

 and within half a mile of dock on the lake. This quarry is owned 

 and worked by L. W. Bond. The opening is about 100 yards long, 

 on the upper side of the wagon road which ascends the hill in a 

 southern direction. Only about 8 feet of beds have been worked. 

 The dip of the strata is 15° easterly, and the beds are from one inch 

 to 15 inches thick. The rock is divided vertically by joints which 

 are irregular in their course, but have smooth faces generally. Near 

 the surface the stone is weathered to a brownish color. There is no 

 covering of earth on the stone. The quarrying operations consist in 

 wedging off the beds without the use of blasting material. The 

 stone are broken readily into convenient sizes, and the blocks are carted 

 to the town, which is the principal market for this quarry. It is 

 used for retaining walls, foundation walls, and for sidewalks. It sells 

 at 50 cents per rod at the quarry, and at 75 cents delivered on cars 



