CHAPTER VIL 



CLAYS IN TERTIARY FORMATIONS. 



CONTENTS. 



The Beacon Hill and Cohansey formations. 



Definition of terms. 



Fossils. 



Clay deposits. 

 Distribution. 

 Character. 

 The Shiloh marl. 

 The Alloway clay. 



Occurrence. 



Character. 

 The micaceous, talc-like clay. 

 The fluffy sand. 

 The Asbury clay. 



Stratigraphic relations. 



Occurrence. 

 The Eocene marl. 



The following subdivisions of the Tertiary beds are recog- 

 nizable in New Jersey, beginning from 1 the top downward. 



8. A coarse gravel member. Beacon Hill gravel 1 Pliocene or 



7. A sand member. Cohansey sand,. j Miocene. 



6. A marl bed — Shiloh marl, 



5. A thick clay bed — Alloway clay, 



4. A micaceous talc-like clayey sand (near Woods- 



, x > Miocene, 



town only),. . . [ 



3. A fluffy sand, 



2. A clay bed — Asbury clay, 



1. A marl bed — Blue marl, Eocene. 



THE BEACON HIEE AND COHANSEY FORMATIONS. 



Definition of terms. — Under the term Beacon Hill, as used in 

 the Annual Reports of the Survey from 1893 to 1900, there have 

 been included two somewhat differ ent beds ; the upper, a bed of 



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