358 W. B. CLARK — UPPER CRETACEOUS FORMATIONS OF NEW JERSEY. 



Eutaw-Rotten Limestone- Ripley faunas of the Gulf, which occupy strata 

 aggregating 1,600 feet in thickness, and which rest probably unconform- 

 ably upon the Tuscaloosa formation, the southern representative of the 

 Potomac. 



9. The Rancocas-Manasquan-Shark River faunas, occupying a con- 

 formable series of beds less than 200 feet in thickness, are absent in the 

 Gulf, and probably represent the time-break between the upper Cre- 

 taceous and Eocene in that region, since the Pamunkey fauna has already 

 been shown to represent approximately the Lignitic-Buhrstone-Claiborne 

 (Lower and Middle Eocene) of the same district. 



10. When compared with European horizons the Matawan-Monmouth 

 fauna is probably Senonian and the Rancocas-Manasquan is Danian in 

 age, while the Shark River fauna must be regarded as lowest Eocene, 

 although showing some affinities to the Calcaire pisolitique of France, 

 which is commonly held to be upper Danian. 



11. The economic products are confined largely to Matawan sands and 

 clays, which have been extensively worked for brick-making, and to 

 Monmouth-Rancocas-Manasquan-Shark River greensand marls, which 

 have for over a century been used as fertilizers. 



