CLAYS OF NEW YORK 741 



The company has recently begun to use a white burning clay ob- 

 tained near West Deerpark, formerly used in the brickworks at that 

 locality. 



I-n July 1899, a large opening had been made at the base of 

 the hill about half a mile northwest of West Deerpark station. 

 The section exposed at that time showed : 



Yellow gravel 4 feet 



Black clay, with some yellow streaks 4 " 



Black clay with white sand in streaks 4 " 



Sand 2 " 



I ■ 



. 14 " 



The clay is loaded on carts and hauled to a siding about 500 

 feet distant, whence it is taken by train to the works. About 600 

 feet east of the present bank, a second one is being opened up. 

 The same clay also crops out at the base of the embankment, where 

 the road from Farmingdale to the Garden City brick co.'s works 

 crosses the railroad siding leading up to the works. 



There is probably an abundance of this clay between Farming- 

 dale and Wyandance, but at most places there is a heavy over- 

 burden of sand and yellow, gravel, usually not less than 15 feet, 

 except at the pit from which clay is now being dug. 



The highly sandy nature of the clay is indicated by a mechanical 

 aiLalysis of the material which yielded: 



Fine sand 84^ 



Clay substance and silt 16^ 



100^ 



All of the sand passed through a 100 mesh sieve. In spite of its 

 highly silicious nature the clay is fairly plastic, and 23^ of water 

 was required to work it up. Scattered through the clay are scales 

 of mica, and occasional grains of pyrite. The shrinkage in drying 

 is 8^ ; up to cone 3, 11^, and cone 6, 15^. At the former cone the 



