FROM WEST PAKISTAN 5 



Trachyleberis (Acanthocythereis) postcornis sp. nov. 82 



Trachyleberis {Acanthocythereis) decoris sp. nov. . 83 

 v. ostracoda and early tertiary correlation in the sulaiman 



Range .......... 85 



(a) Biostratigraphic Units ....... 85 



(b) Statistical Correlation of ranges of ostracod species common to 



the Rakhi Nala and Zao River sections .... 89 



(c) Conclusions . . . . . . . . .91 



VI. Appendices ......... 93 



VII. References .......... 95 



Tables, and Rakhi Nala and Zao River Sections In pocket on 



Cover p. iii 



SYNOPSIS 



Ostracoda from the Palaeocene of the Sor Range and from the Palaeocene and Eocene of the 

 Rakhi Nala, Zao River and Shpalai Khwara sections, Sulaiman Range, West Pakistan, have 

 been examined. The family TRACHYLEBERIDIDAE has been studied in detail. It is 

 represented by fourteen genera, four subgenera and fifty-nine species. Four new genera 

 {Alocopocy there, Gyrocy there, Phalcocythere and Stigmatocy there) and two new subgenera (Para- 

 costa and Scelidocythereis) are proposed. Out of the fifty-nine species described, fifty-four are 

 new. Two species belonging to the genus Phalcocythere one from the Paris Basin and the other 

 from Tanzania are also described. 



The Palaeocene and Eocene of the Rakhi Nala section are divided into five ostracod bio- 

 stratigraphic units. The biostratigraphic units IV and V of the Rakhi Nala are represented in 

 the Zao River section and have almost identical ostracod faunas. The biostratigraphic unit 

 IV of the Rakhi Nala is also represented in the Shpalai Khwara section. The Equations of 

 Correlation between the Rakhi Nala and Zao River sections for biostratigraphic unit V (i. e. 

 Middle-Upper Eocene) have been calculated by means of ranges of ostracod species common to 

 the two sections. The standard errors of estimate for the Equations of Correlation have also 

 been calculated. The boundaries between the Palaeocene-Lower Eocene, Lower-Middle 

 Eocene and Middle-Upper Eocene in the Sulaiman Range are discussed. 



1. INTRODUCTION 



The most comprehensive work so far published on the area is that of Eames (1952 ab). 

 Most of his lithological subdivisions for the Eocene succession of the Rakhi Nala and 

 Zinda Pir areas occur in the northern Sulaiman Range, i.e. in the Zao River and 

 Shpalai Khwara sections. These can easily be distinguished on the basis of lithology 

 and micro fauna. Eames' terminology of the rock units is therefore adopted here. 

 Bayliss (1961) and Latif (1961 and 1964) are other recent workers who have con- 

 tributed to our knowledge of the Palaeocene and Eocene in the Rakhi Nala section. 

 However, they used a different terminology for the rock units to that used by 

 Eames, and Fig. 2 shows the correlation between these workers along the Rakhi Nala 

 section. 



The samples from the Rakhi Nala section examined for ostracods were the same as 

 used by Bayliss and Latif, who worked on larger and pelagic foraminifera respect- 

 ively. These samples were collected by Bayliss. The sample numbers as given by 

 the collector are used in this paper. Latif altered the sample numbers after 3200 by 

 subtracting two hundred, i.e. his sample no. 3201 is the same as collector's no. 3401, 

 and so on. 



