32 PALEONTOLOGY OP NEW JERSEY. 



Creek and Haddoufield Micaceous clays at the base of or below the Lower 

 Green Marls and the Eufaula, Alabama, and Tippah, Mississippi, beds of 

 j\Iessrs. Com-ad and Gabb, for many of the species are identical, and even 

 tlie lithological characters of the beds and conditions of preservation of the 

 fossils are so nearly alike as to render it almost impossible to distinguish 

 them apart. With the western Cretaceous formations there is, however, a 

 much less similarity, although the generic resemblance is still very striking, 

 many of the genera being the same in both, while the species are often 

 very close representatives of those at the West found in the Fort Pierre 

 group. No. 4, or perhaps more properly in Nos. 4 and 5 of Meek and 

 Hayden's Upper Missouri section. Still there can be no question as to the 

 very close relationship of the Lower Marl beds of New Jersey and the 

 Crosswicks and Haddonfield beds to the Fort Pierre group, No. 4, of the 

 Upper Mississippi section. 



This reference of the New Jersey Marls to Nos. 4 and 5 of the Upper 

 Missouri section is by no means a new feature in their study, for it has been 

 made by several paleontologists and geologists in the past, so that it has 

 become generally understood. But heretofore it has been done collectively, 

 or as a whole, as far as concerns the New Jersey formations; while the 

 fossils are here for the first time separated according to the diiferent beds 

 in which they occur, and studied separately, and consequently this study 

 more positively confirms these previous classifications. Yet it proves im- 

 possible clearly to separate the New Jersey formations to correspond to 

 the different numbers and strata recognized at the West, they having rather 

 the expression of the two beds Nos. 4 and 5 combined. 



