CLAYS OF NEW YORK 5Y9 



From Glasco to Eondout the terrace, whicli is perhaps one eiglith 

 of a mile broad at GlascO', narrows as it nears Rondont, and lias 

 an average liight of 150 feet. Tlie clays, so far as could be ascer- 

 tained, lie on the upturned edges of the Utica shale. 



At the rear of A. S. Staples's yard hardpan underlies the clay. 

 The overlying material at this locality consists of sand and gravel, 

 in many instances stratified and sometimes cross-bedded. The 

 sand in some spots is 10 to 15 feet thick and fine enough to be 

 blown by the wind. 



At Port Ewen the clay is mostly blue, resting on a mass of 

 hardpan, and in a few places on the glaciated rock surface. Accord- 

 ing to Mr Kline, of Port Ewen, the clay around the village is 

 nowhere over 18 feet in actual thickness and is underlain by hard- 

 pan. A point worthy of notice is the difference in level of 50 feet 

 between the terrace at Port Ewen and at Glasco. 



It has been suggested by Dr Frederick J. H. Merrill that this 

 may be due to the fact that, when sediment is deposited in a 

 basin its edge would be higher than the center. The Quaternary 

 formation broadens on toward the west, and Port Ewen would be a 

 point on the basin's edge, while Glasco is near the center. 



In this connection the following well records are of interest. 

 A boring made on the property of Isaac Tamney, at Eddyville, 

 showed: 



Sandy loam 10 feet 



Quicksand 70 " 



Blue clay 10 " 



Gravel 



Total thickness 90 " 



