IN THE ESNA-IDFU REGION, NILE VALLEY, EGYPT 185 



by Cushman (1926), White (1928), and Hay (i960) where the latter showed it to 

 range from the Upper Danian G. uncinata Subzone throughout the whole of the over- 

 lying Landenian, where it becomes a flood form. 



Bolli (19576) recorded G. velascoensis throughout the G. pseudomenardii - G. velasco- 

 ensis Zones of the lower Lizard Springs formation, Trinidad, which are here consider- 

 ed as Upper Paleocene. It was again recorded from the same zones in the Paderno 

 d'Adda section of northern Italy, which Bolli & Cita (1960a, 6) considered to be 

 Upper Montian-Thanetian. 



Globigerina velascoensis was also recorded from the Paleocene of Guatemala 

 (Bermudez 1961) and from the Paleocene of Austria (Montian-Landenian-Ilerdian) 

 (Hillebrandt 1962). 



Reliable references show that G. velascoensis ranges only through the Upper 

 Paleocene. All records of this species from rocks younger than Upper Paleocene, 

 (e.g. Emiliani 1954, who recorded it from the Lower Oligocene of Italy) are either 

 erroneous or of reworked specimens, while all records from older strata (e.g. Hay 

 i960 and Hillebrandt 1962) are most probably confused with apparently similar 

 Globigerina species. 



In the Esna-Idfu region, G. velascoensis appears in the basal part of the Upper 

 Palecocene Globorotalia velascoensis Zone, and continues as a rare to common form 

 to the upper part of this zone, where it dies out completely. 



Family GLOBOROTALIIDAE Cushman 1927 

 Subfamily GLOBOROTALIINAE Cushman 1927 

 Genus GLOBOROTALIA Cushman 1927 

 Type species. Pulvinulina menardii (d'Orbigny) var. tumida Brady 1877. 



19276 Globorotalia Cushman : 91 (Type species : Pulvinulina menardii (d'Orbigny) var. tumida 



Brady 1877). 

 1949 Globorotalia {Globorotalia) Cushman & Bermudez : 28 (Type species : Pulvinulina 



menardii (d'Orbigny) var. tumida Brady 1877). 

 1949 Globorotalia (Truncorotalia) Cushman & Bermudez : 35 (Type species : Rotalina trun- 



catulinoides d'Orbigny 1839). 

 1949 Globorotalia (Turborotalia) Cushman & Bermudez : 42 (Type species : Globorotalia 



centralis Cushman & Bermudez 1937). 

 1953 Acarinina Subbotina : 219 (Type species : Acarinina acarinata Subbotina 1953). 

 1957 Planorotalia Morozova : 11 10 (Type species : Planulina membranacea Ehrenberg 1854). 



1957 Planorotalites Morozova : 11 12 (Type species : Globorotalia pseudoscitula Glaessner 1937) ■ 



1958 Globorotalia (Astrorotalia) Turnovsky : 81 [Type species : G. (A.) stellaria Turnovsky 

 1958]. 



J 959 Globigerina (Eoglobigerina) Morozova : 11 15 [Type species : Globigerina (Eoglobigerina) 

 eobulloides Morozova, 1959]. 



Emended diagnosis. Test free, trochospirally coiled, with relatively wide 

 range of variation in size and shape, globigerine, biconvex or planoconvex ; dorsal 

 side evolute, flat or inflated ; ventral side umbilicate, moderately or strongly pro- 

 truding ; plane of coiling either horizontal or curved ; equatorial periphery 



