CLASSIFICATION AND CORRELATION. 179 



where the Red Bank and Tinton have thinned out, and the Nave- 

 sink and Hornerstown marls are in juxtaposition, this line can- 

 not be sharply located stratigraphically. It seems to be impor- 

 tant that certain definite names be applied to these two major 

 faunas, yet none of the names heretofore used in New Jersey 

 are at all applicable to either of the divisions. It will be noticed 

 on examining the tables of distribution of the faunas from the 

 Cliffwood to the Tinton, given above, that in each fauna a con- 

 siderable number of species have an extra-territorial distribution, 

 and by far the larger number of these species which occur out- 

 side of New Jersey are known from the upper Cretaceous for- 

 mations of the Gulf-border region, in the Ripley and associated 

 formations of Alabama, Mississippi, Texas, etc. The com- 

 munity of species between this southern region and New Jersey 

 is so marked that no doubt can be entertained as to the essential 

 time equivalence of the formations and faunas of the two 

 -regions, and because of the typical development of the faunas 

 in the Ripley formation this series may be designated by the 

 name Ripleyian. 



The higher fauna recognized in the Cretaceous formations of 

 New Jersey appears to have its typical development in this State. 

 Its most conspicuous faunule is the one characterized by Tere- 

 bratula harlam, but south of Maryland this fauna has not been 

 recognized, although the species T. harlani has been identified 

 from some of the Eocene beds of the south. This higher fauna 

 may therefore be designated as the Jerseyian. 



The Ripleyian fauna in New Jersey characterizes all the marine 

 beds up to the top of the Tinton, including the Magothy below. 

 The subordinate formations carrying this fauna are without 

 -doubt strictly local, as is shown even in their distribution in New 

 Jersey, where the Englishtown and Red Bank formations do not 

 -continue entirely across the State. In Maryland, as has been 

 shown by Clark, the New Jersey formations described above 

 -cannot all be recognized, yet the Ripleyian fauna is clearly de- 

 fined. In the States further south the local formations vary, 

 their lithologic characters, whether sand, clay, or calcareous 

 material, being dependent upon the local conditions which 



