GEOLOGY AND GEOGRAPHY OF CLAY DEPOSITS 



135 



hotel at Kreischerville, and from this a yellow mottled fire clay is 

 obtained. This latter bed is overlain by about 20 feet of sand 

 and yellow gravel and underlain by a white sand. 



A fourth opening on the shore is in a blue clay. It has always 

 been an interesting question as to what extent Staten Island was 

 underlain by the Cretaceous formation, and the following record 



Clay Pit, Kreischervjlle, N. Y. 

 (Yellow gravel over Cretaceous clay.) 



of a well bored for Bachman's brewery at Annandale, S. L, seems 

 to throw some light on the subject : 



At a depth of 200 feet a bed of yellow gravel containing shells 

 was struck. The gravel was 36 feet in thickness and beneath it 

 was a bed of clay 10 feet thick. This latter was of a white and 

 blue color and was said to resemble a fine pottery clay. 



The above may very possibly be some of the Cretaceous clay 

 overlain by the yellow gravel. Borings made at various points 

 along the shore of Arthur's Kill, between Kreischer's factory and 

 Wood & Keenan's brickyard, penetrated a blue clay at a depth 

 of three or four feet. This latter is no doubt of very recent 

 origin. 



At the Anderson Brick Company's pit near Green Ridge, the 

 lower clay, which is of a black color, shows signs of disturbance, 

 and slicken sided surfaces are common. The upper portions of 



