>bo UPPER CRETACEOUS-LOWER TERTIARY FORAMINIFERA 



(3). Following Bolli (1957&) they mention a " Globorotalia uncinata zone ". 

 However, G. uncinata, as seen in the present study, occurs in the upper part of the 

 " Globorotalia compressajGlobigerina daubjergensis Zone " and continues almost to the 

 base of the " G. velascoensis Zone ". It floods the lower part of the " G. angulata 

 Zone" and is only taken to characterize this part as a distinct subzone. They also 

 refer to the occurrence in this zone of Globorotalia compressa (Plummer) and Globoro- 

 talia colligera (Schwager) among others, although G. compressa is restricted to the 

 Danian and G. colligera was originally described from the Lower Eocene. 



(4). Again, following Bolli (19576) they refer to a " Globorotalia pusilla pusilla 

 Zone ", stating that this subspecies marks a zone at the base of the Landenian to 

 which it is restricted, while the other subspecies G. pusilla laevigata only exists in the 

 basal Eocene. However, in the present study G. pusilla pusilla was found to flood 

 the upper part of the " G. angulata Zone ", characterizing a particular subzone, and 

 to fade out gradually into the basal part of the overlying " G. velascoensis zone ", 

 while G. pusilla laevigata ranges throughout the lower part of the latter zone, but not 

 in the Lower Eocene. They state (p. 380) that " The topmost 10 metres of the 

 Dakhla shale of Gebel Aweina are characterized by a number of Globorotalia species 

 that belong to the sharply keeled forms : G. pusilla pusilla, G. angulata, G. perclara, G. 

 ehrenbergi, G. triplex and G. simulatilis . . .", none of which is a sharply keeled form. 



(5). Like Bolli (19576) they mention a " Globorotalia pseudomenardii zone " and a 

 " Globorotalia velascoensis zone ". The present study, however, showed that the 

 two species appear for the first time together and the former only characterizes the 

 lower part of a zone distinguished by the latter species. They also mention the 

 existence in the " G. velascoensis zone " of Globorotalia broedermanni Cushman & 

 Bermudez, a known Lower-Middle Eocene form. Moreover, they extend the range 

 of G. velascoensis to cover 76 ms. above the chalk, while the species has been found in 

 the present study to die out completely at a vertical distance of 60 ms. from the top 

 of the chalk. 



(6). Because of their uncertainty, they state (p. 380) : " The age of the above 

 mentioned four zones is interpreted as Landenian, although the G. pusilla and G. 

 pseudomenardii zones could well be Montian, in which case the G. uncinata zone 

 might be either Danian or Montian ". 



(7). They refer to a " Globorotalia rex zone " of Ypresian age, although their 

 figured G. rex Martin (p. 385, pi. 2, figs. 3«-c) is possibly G. bollii El-Naggar. They 

 also record the occurrence of G. pusilla laevigata Bolli and G. conicotruncata Subbotina 

 in their " G. rex zone ". The former species is restricted to the lower part of the 

 Upper Paleocene, while the latter is probabty synonymous with the definitely 

 Paleocene G. angidata abundocamerata Bolli. 



B. Concerning their determinations of planktonic foraminifera : 



(1). Praeglobotruncana coarctata Bolli (p. 381, pi. 3, fig. 23) is Rugoglobigerina 

 macrocephala Bronnimann ; Bolli's species is morphologically and stratigraphically 

 distinct and has only been recorded from the Lower Campanian. 



