32 PALEONTOLOGY OF NEW JERSEY. 
Creek and Haddonfield Micaceous clays at the base of or below the Lower 
Green Marls and the Eufaula, Alabama, and Tippah, Mississippi, beds of 
Messrs. Conrad and Gabb, for many of the species are identical, and even 
the 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 different 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. 
