CORRELATION OF DEPOSITS. 355 



the representatives of the Cretaceous stages of the Senonian and the 

 Danian as well as the very earliest stage of the Eocene of Europe. 



The Matawan-Monmouth fauna has many strong Senonian affinities 

 in its cephalopod and pelecypod forms, while the Rancocas and less dis- 

 tinctly the Manasquan point to the Danian. It is interesting to note 

 that the lower Danian, known as the Maestrichtian or Maestricht chalk, 

 also has an extensive development of Bryozoan marls very similar in 

 character to the Vincentown lime-sands, while its paleontological affini- 

 ties are much the same. 



Regarding the equivalents of the Shark River fauna, there is much 

 greater obscurity. In its paleontological relations to the underlying 

 formations it is not unlike the Calcaire pisolitique of France, in which the 

 general aspect of the fauna resembles the oldest Tertiary, although a 

 number of undoubted Cretaceous species still persist. These deposits 

 are put in the substage Garumnian as the upper member of the Danian 

 by European geologists. It is possible that the Cretaceous affinities of 

 the Garumnian are somewhat closer than those of the Shark river, but 

 one or two characteristic Cretaceous forms are thought to persist in the 

 latter also. On the whole, however, it seems best to consider the Shark 

 River fauna as approximately the representative of the basal Eocene of 

 Europe, since the assemblage of forms. points so strongly to their Tertiary 

 affinities. Further than that it is impossible to go. 



At best the correlation of the American Coastal Plain formations with 

 European must be of the most general character, in which the broader 

 affinities of the faunas only are shown. The wide difference in condi- 

 tions is such as to preclude detailed comparisons of the deposits upon 

 the opposite sides of the Atlantic. 



Economic Products. 



The economic products of the Upper Cretaceous formations are con- 

 fined largely to the sands and clays which have been extensively worked 

 for brick-making, and to the greensand marls, which for over a century 

 have been used as fertilizers. 



The workable sands and clays come entirely from the Matawan forma- 

 tion and mainly from its lowest member, the Cross wicks clays. These 

 deposits are extensively worked in New Jersey at the present time, along 

 the banks and in the vicinity of Matawan creek, in Monmouth county ; 

 upon Cross wicks creek and near Bordentown and Kinkora, in northern 

 Burlington county, as well as upon Pensauken creek near Lenola, in its 

 southern part; a few miles to the east of Camden, in Camden county, 



LIII— Bull. Geol. Soc. Am., Vol. 8, 1896 



