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, 6 



Marshalltown, 8 



Wenonah, 10 



Mt. Laurel-Navesink, 22 



Red Bank, 17 



TINTON, ; 33 



Ripley Group, etc., 20 



A notable feature of the above summary table is the distinct 

 alternation which is shown in the relationships of the Tinton 

 fauna, as exhibited by the number o*f 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 

 of 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. 

 Axin\ea subaustralis. 

 Dianclwra echinata. 

 Vcniella trigona. 

 Margarita abyssima. 



