STUDIES IN FORAMINrFEBA 



175 



(1957), the Paleocene has the most restricted generic 

 assemblage of coiled planktonic Foraminifera found 

 since the mid-Cretaceous, containing only species of 

 Globigerina, Globigerinoides and Globorotalia. 



Reiss (1955) described a planktonic faunal sequence 

 in Israel, with only Globigerina (and Globorotalia with 

 rounded periphery) in the oldest strata (Reiss believed 

 this stage represented Danian, but belonged in the 

 Tertiary), followed by a Globigerina-'kQe\&A Globoro- 

 talia assemblage in the Paleocene. This same sequence 

 can be recognized throughout much of the world. In 

 Sweden, Denmark, Russia, the near East, Egypt, the 

 American Gulf and Atlantic coasts, and Trinidad, no 

 angular or keeled Globorotalia are found in the lower 

 Paleocene. They do occur in middle and upper Pa- 

 leocene strata in these and other areas, so that correla- 

 tions within the Paleocene may even be made on a 

 generic or subgeneric level in the planktonic Foramini- 

 fera, and much more refined correlations may be based 

 on the species. 2 



The Paleocene is here regarded as including the 

 Danian (=Montian) and Landenian stages of the 

 standard European time scale. Tj^jical Paleocene 

 species of planktonic Foraminifera are Globigerina 

 triloculinoides and Globorotalia pseudobulloides. The 

 former ranges throughout the Paleocene and the 

 latter in about the lower one-half. 



The Danian stage, or lower Paleocene, contains a 

 planktonic assemblage of Globigerina, Globigerinoides, 

 and Globorotalia with rounded periphery. The plank- 

 tonic species found in the type Danian of Denmark 

 also occiu- in the Kincaid and Wills Point formations 

 of Texas, the Pine Barren and McBryde members of 

 Alabama and the Brightseat formation of Maryland 

 (text-fig. 27). The faunal lists given by Muir (1936) 

 which were prepared by Helen Jeanne Plummer show 

 a restricted Globigerina fauna, like that of the Danian, 

 in the lower part of the Velasco (or Tamesi) formation 

 of Mexico. All these formations are therefore regarded 

 here as lower Paleocene. Species most typical of this 







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Truncorolaloides 

 assembloge 



Nonofolla (m 

 Alo. 





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Keeled 

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 assemblage 



Velosco (mbpi) 

 Meiico 







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 Vo- Md. 



































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 marl Alo. 









































































Globigerina 

 assemblage 



Willi Point fm 



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Kincaid fm 

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Figure 27. — Range chart of planktonic Foraminifera in the Paleocene and lower Eocene of the Gulf and Atlantic coastal regions. Location of 

 formations in the chart, within each assemblage, does not necessarily imply their relative stratigraphic position, which is given in fig. 28. Ranges 

 of species in the Velasco formation are given only for the upper part (the Globorotalia velascoensis zone), although the Velasco also includes 

 older strata, representative of the Globigerina assemblage. 



