GEOLOGY AND GEOGRAPHY OF THE CLAY DEPOSITS 



501 



Pond and Fisher Island are very similar in appearance and com- 

 position, are very probably of the same age, possibly Tertiary, 

 but we lack palaeontologic or stratigraphic evidence. At West 

 Neck the clay underlies the yellow gravel, and the latter is 

 covered by the drift, so that is Pre-pleistocene. 



The clays of Staten Island are chiefly Cretaceous, as proven 

 by the fossils found in them. The chief outcrops are at 

 Kreischerville, Green Ridge and Arrochar. Besides the clay 

 there are several " kaolin " deposits. 



