STUDIES IN FORAMINIFERA 



177 



European 

 Stage 



Ptanktonic 



Faunal 

 Assemblage 



Plankfonic 



Faunal 



Zone 



Alabama 



EOCENE 



Globigerina- 

 Globorotalio- 

 Truncorotaloifles 

 assemblage 



rex 

 zone 



Arc gon 



Wilcox 

 group 



Spornacian 



Globigerino- 



Globorotolio 



assemblage 



velascoensis- 

 acuta- 

 spirolis 

 subzone 



P 



pseudobulloides 



"i 



Globigerlna 

 assemblage 



compresso- 

 daubjergensis 



Wilis Point 

 fm * 



± Kincaid 

 fm < 



CRETACEOUS MAESTRICHTIAN 



Globotruncana 

 assemblage 



Mendez 

 fm 4 



Navarro 

 group * 



Ripley fm 



Figure 28. — Correlation table of Paleocene and lower Eocene strata of the Gulf and Atlantic Coastal regions, based on the included planktonic 

 species. Material has been examined from each of the formations marked ^ ; all post-Cretaceous planktonic occurrences are shown in the 

 range chart in fig. 27; correlation of those strata which did not contain planktonic species is based on relative stratigraphic position. 



Acknowledgements 



This paper is one of the series on planktonic Foram- 

 inifera and their stratigraphic application for which 

 technical assistance and illustrative work have been 

 in part financed by grants-in-aid of research from the 

 California Eesearch Corp., Carter Oil Co., Gulf Oil 

 Corp., and the Humble Oil and Refining Co., to which 

 we express our gratitude. 



The -writers also gratefully acknowledge the as- 

 sistance of Dr. J. B. Troelsen, Copenhagen, Denmark, 

 who supplied material from the type Danian; of Mr. 

 R. Wright Barker, Shell Development Co., Houston, 

 Texas, who fiu-nished some excellently preserved upper 

 Velasco material used in the present study; of Dr. 

 Stephen Fox of Rutgers University, New Brunswick, 

 New Jersey, and of Dr. Norman Sohl of the U. S. 

 Geological Survey, who accompanied Alfred R. Loeblich 

 Jr., in field study of the Vincentown formation, and in 

 collecting material from the Vincentown and Horners- 

 town formations of New Jersey; and of Mr. Richard 

 Page, Smithsonian Institution, for field assistance in 

 collecting material from the Brightseat and Aquia 

 formations of Maryland and Virginia. 



We also are grateful to Dr. John Imbrie of Columbia 

 University, New York City, for making available the 



type specimens of the Velasco species described by 

 Maynard White, for some of which lectotypes have 

 here been selected and reihustrated. 



Illustrations on the plates are camera lucida draw- 

 ings, prepared by Patricia and Lawrence Isham, 

 scientific illustrators, U. S. National Museum. 



A total of 43 species of planktonic Foraminifera are 

 described and illustrated. Of these, 8 belong to the 

 genus Globigerina and one to Globigerinoides, in the 

 family Orbultnidae. The family Globorotaliidae is 

 represented by 26 species of Globorotalia, and the family 

 HeteroheUcidae by 1 Heterohelix, 4 Chiloguembelina, 2 

 Tubitextularia, and 1 Woodringina. Of the species 

 described, 13 are new. 



In the following descriptions, only partial synonymies 

 are given. The original reference is cited and addi- 

 tional references are given only to the local occiurences. 

 Solely on the basis of the Uteratm-e, it is impossible to 

 state with certainty the actual occurrence of a species 

 without reference to the figured and described material. 

 Therefore, when a reference is given in the synonymies 

 which follow, the type specimens have in general been 

 compared by us with our material. Only the 

 Russian types of certain of the Paleocene species have 

 not been personally studied by us. 



