TINTON BEDS. ' 153 



Analytical Discussion of the Tinton Fauna. 



The summary table here given exhibits some of the data 

 recorded, in the above distribution tables in a condensed form, 

 7 of the species, or 21 per cent, of the whole, being restricted to 

 the formation : 



Cliffwood, 2 



Merchantville, 1 1 



Woodbury [ g 



Marshalltown, •. g 



Wenonah, lo 



Mt. Laurel-Nayesink 22 



Red Bank, 17 



TINTON, 33 



Ripley Group, etc., 20 



A notable feature of the above summary table is the distinct 

 alternation which is sho^wn in the relationships of the Tinton 

 fauna, as exhibited by the number of species common to the 

 Tinton and to each of the other faunas in succession, the Nave- 

 sink, Marshalltown and Merchantville being the more closely 

 allied to the Tinton. The only exception in this regular sequence 

 O'f alternation is in the Wenonah, where a larger number of 

 Tinton species are present than in the Marshalltown. It has 

 already been shown, however, that the Wenonah fauna is dis- 

 tinctly different from that of the Marshalltown and the Mount 

 Laurel-Navesink, having its most intimate relations with the 

 Woodbury. The greatest community of species is between the 

 Tinton and the Mount Laurel-Navesink faunas, two-thirds of 

 the Tinton species being present in this earlier fauna. The fol- 

 lowing Tinton species, not observed in the Red Bank, are recur- 

 rent from the Mount Laurel-Navesink : 



Cucullaea antrosa. 

 Axinca sitbaii^tralis. 

 Dinnchora echinata. 

 Veniella trigoim. 

 Margarita abyssima. 



