RED BANK SAND. 143 



ANALYTICAL DISCUSSION OF THE RED BANK FAUNA. 



A summary of the above tables shows the following numbers 

 of Red Bank species which are common to each of the other 

 faunas in the series. Only 4 species, or 9 per cent, of the whole, 

 are restricted to the Red Bank. 



Cliffwood, 8 



Merchantville, 19 



Woodbury, 19 



Marshalltown, 13 



Wenonah, 27 



Mt. Laurel- Navesink, 23 



RED BANK, 43 



Tinton, 17 



Ripley Group, etc., 29 



In its essential features the Red Bank fauna is a recurrence 

 of the Lucina crptacea fauna of the Cliffwood, Woodbury and 

 Wenonah formations, with a smaller element holding over from 

 the Navesink. None of the highly characteristic species of the 

 foreign element in the Navesink fauna, however, such as Belem- 

 nitella americana and Terebratella plicata occur in the Red Bank. 

 A notable feature of the Red Bank fauna is the small number 

 of species which are restricted to it, these species constituting 

 only 9 per cent., while in the Mount Laurel-Navesink 48 per 

 cent, of the species were restricted to the fauna. The essentially 

 recurrent nature of the fauna and its relationships to the Wen- 

 onah and Woodbury, rather than to the Mount Laurel-Navesink 

 and Marshalltown faunas, is clearly shown by the table above, 

 the Wenonah and Woodbury faunas having more species com- 

 mon to the Red Bank than do the Mount Laurel-Navesink and 

 Marshalltown. The Merchantville has the same number of Red 

 Bank species as are present in the Woodbury, 15 of the 19 such 

 species being present also in the Woodbury. The reappearance 

 in the Red Bank fauna of Lucina cretacea is an important feature 

 in the fauna. This species was one of the most diagnostic mem- 

 bers of the Woodbury fauna, but has not been observed in any 



