The Genus Globotruncana in Tunisia

The Upper Cretaceous of northern Tunisia is represented by a thick sequence of marine shales with some calcareous interbeds. The environment was favorable to life, and pelagic microfossils are widely distributed. The Globotruncanas, in particular, are represented by numerous species, most of them occurring abundantly. Their good state of preservation permits their use in detailed correlations of numerous field and well sections. The purpose of this study is to show the current use of Globotruncana in Tunisian biostratigraphy. In order to avoid confusion, poorly described species, the holotypes of which need to be revised, have not been used. Three new subspecies of stratigraphic significance are proposed, while others are rejected as synonyms. Species are grouped into evolutionary series according to the author's ideas, when sufficiently abundant intermediate forms have been found to link them. The classification adopted here is that of Reichel (1950).