LIME AND CEMENT INDUSTEIES 811 



second grade rock, tlie massive, or first grade, and a tMrd type of 

 more earthy appearance, which slakes very readily when burned. 

 The product from Johnson's (pi. 61) and also T. F. Staine's kiln 

 is sent largely to Batavia. 



Extensive deposits of marl occur near Clarendon, southwest of 

 Holly, but the material is not worked. Marl is said to be found 

 2^ miles north of Medina,"^ and southwest of Clarendon. Some 

 effort has been made to employ it for Portland cement. 



Putnam county ^ 



Quarries exist at Patterson and at Towners in Putnam county. 

 The quarry at Towners is 1 mile northwest of the 'New England 

 railroad. The stone is gray and white, coarsely crystalline and 

 contains many crystals of white or light green pyroxene scattered 

 through it. Mica flakes are also abundant in the rock. It is a 

 magnesian limestone with considerable silica in its composition. 

 The quarry at Patterson is on the Haight property half a mile 

 southeast of the railway depot. The opening is about 15 by 40 

 feet in area and 60 feet deep. A number of blocks of stone have 

 been taken out, but all show the rock to be full of mineral im- 

 purities, such that it would not make a very high grade lime. 



Rensselaer county ^ 



A belt of impure limestone of Cambro-Silurian age extends from 

 Lebanon Springs to Petersburg, but outcrops are scarce. 



Another small area extends from the vicinity of ISTorth Peters- 

 burg to Eagle Bridge and underlying an area several miles wide 

 west of Hoosick Falls. At the last locality a number of small 

 quarries have been opened on a hill west of the town, and show 

 well the varying character of the stone, as well as its purity in 

 certain beds. The rock varies from a nearly pure limestone to a 

 black calcareous slate. It has been used to some extent for flux 



1 Hall, James. Geol. 4th dist. N. Y. p. 437. 



2 Mather, W. W. Geol. 1st dist. N. Y. 1843. 



