Limestones. 103 



Clarke's Point, and on the east side of the neck. About eighteen 

 acres of land is here, in part covered by a thin soil only, or the solid, 

 glaciated rock makes the surface. The quarry of the Lake Champlain 

 Blue stone Company is opened on the line of strike of the rock, about 

 due west, for a length of 1,000 feet, and at the west side 

 its breadth is 250 feet, or an area estimated at three acres. The 

 greatest depth was 25 feet, all above the lake level. The beds dip 6° 

 to 8° north, 10° east ; and they are divided by a set of seams or 

 joints, which run north 10° east and by another, which is less regular 

 and persistent, in an east to west direction. The first system is ver- 

 tical. The beds are from one to six feet thick ; and the whole thick- 

 ness of the workable beds is 16 to 18 feet. The stone is light blue in 

 color, weathering on exposure to a light gray; and, in some of the 

 mass, showing lenticular and roughly parallel-arranged, thin layers of 

 ash-gray in the darker matrix, somewhat like the clay seams of some 

 limestones. There is a dock at the south-east side of the quarry ; and 

 the six derricks and engine-house are still in the quarry. The place 

 was worked extensively from 1854 to 1869, by S. W. Clark & Com- 

 pany. Large quantities of the stone went to the capitol at Albany 

 and to the Brooklyn bridge. 



S. W. Clark works the quarry about 30 rods west-north-west of the 

 old quarry. The dip and joints or seams and the stone are much like 

 those of the latter. The very regular, vertical joints, the even beds, 

 the absence of any stripping, and the convenient location to naviga- 

 tion are the notable advantages of the place. 



The Willsborough Neck or " Lake Champlain blue stone" was used 

 in the Reformed church, Swan street, Albany ; in the State street 

 Methodist Episcopal church in Troy ; in the Brooklyn bridge pie lis, 

 and in the eastern foundations aLid sub-basement of the capitol at 

 Albany. From one hundred to three hundred men were employed 

 from 1869 onward for two to three years. At present the force is 

 from six to ten, and the business is ashlar and cut trimmings for 

 buildings, and specially in heavy blocks for bridge and lock work. 



Plattsburgh, Clinton County. — North of Plattsburgh, and in 

 the town of the same name there are several quarries in the Chazy lime- 

 stone formation which are worked according to the demand for stone. 

 The principal ones are within two miles of the town on the east of 

 the Beekmantown road. 



The first one here to be noted is the Pratt quarry, a few rods west 



