CHECK LIST 



LWERTEBRATE FOSSILS OF I^OHTH AMERICA. 



A. EOCENE.* 



1. LOWEK AXD MEDIAI. EOCENE. 



SUBKIXGDOM PROTOZOA. 



Class RHIZOPODA. 



Order FORAMINIFERA. 



Camerinidae. 



1. Cristellaria rotella, Conrad. Flor. 



2. Nemophora floridana, Conrad. Flor. 



' The Eocene Period in Nortli America may be subdivided into three 

 distinct groups, which I believe hold few, if any, species in common. These 

 I have designated "Lower, Medial, and Upper Eocene." Localities of the 

 first subdivision occur near Washington, D. C. ; Piscataway and Upper 

 Marlboro', Md. ; Pamunkey River, Va. ; Shark River, N. J. ; and at Clai- 

 borne in the lowest bed, only visible in a low stage of the water. The 

 second subdivision occurs in the fossiliferous sand in the upper part of 

 Claiborne Bluff, immediately beneath the Upper Eocene limestone. A 

 portion of the Buhr Stone of South Carolina and Georgia falls in this sec- 

 tion, as well as the " Shell Bluff Group" on the Savannah River. All the 

 Eocene species of New Jersey are from Shark River, Monmouth Co., except 

 Ostrea georgiana, Conrad. 



As the Eocene of Georgia has not been generally investigated, the Echino- 

 dermata of that State are only provisionally referred to the Jackson Group. 



The portion of the Check List which includes the land and fresh-water 

 shells is published on the authority of F. B. Meek. 



An asterisk (*) is prefixed to the Lower Eocene species to distinguish 

 them from those of the Medial Eocene. 



The Upper Eocene species form a separate list, beginning on p. 21. 



There are five distinct Tertiary formations between the Cretaceous and 

 Miocene epochs. 1. Shark River Group; 2. Claiborne Group; 3. Shell 

 Bluff Group ; 4. Jackson Group ; 5. Vicksburg Group. The three lower 

 divisions are referred to the Eocene, and the first list includes the fossils 

 of the two oldest divisions, but each of the newer groups has a separate 

 list, beginning respectively on pages 20, 21, and 26. 



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