IN THE ESNA-IDFU REGION, NILE VALLEY, EGYPT 133 



in great abundance in association with G. stuarti stuarti, G. stuarti stuartiformis and 

 G. stuarti subspinosa. A few meters higher in the succession, all the other subspecies 

 disappear, but G. stuarti parva continues as a common to rare form in the overlying 

 G. esnehensis Zone. 



Gandolfi (1955) described G. stuarti parva from the Colon shale of northeastern 

 Colombia, and considered its range as Campanian-Maestrichtian. However, the 

 distribution of Globotruncana species in the Colon shale seems to indicate that the 

 whole formation is Maestrichtian in age as not a single exclusively Upper Campanian 

 species is present even in the lowest part. 



G. stuarti parva was also recorded from the Maestrichtian rocks of Trinidad 

 (Bolli 1951) and of southeastern Turkey (Tilev 1951, 1952) where it was lumped 

 with G. stuarti stuarti. 



Globotruncana stuarti stuarti (de Lapparent) 



(PL 8, figs. 4a-d ; PL 9, figs. la-d) 



19186 Rosalina stuarti de Lapparent : 11-14, pi. 1, figs. 5, 6, 7, text-figs. 4, 5. 



1928 Globotruncana rosetta (Carsey) ; White : 286, pi. 39, figs. ia-e. 



1941 Globotruncana stuarti (de Lapparent) Vogler : 289, pi. 23, figs. 40-43. 



1941 Globotruncana linnei stuarti Vogler (pars) : 289, pi. 24, fig. 8, non figs. 9-13. 



1945 Globotruncana stuarti (de Lapparent) ; Bolli : 236, pi. 9, fig. 18, text-fig. 1 (27, 28). 



1948 Globotruncana stuarti (de Lapparent) ; Cita : 160-161, pi. 4, figs. ja-c. 



1949 Globotruncana {Globotruncana) stuarti (de Lapparent) ; Reichel : 613-615, pi. 16, 

 fig. 10, pi. 17, fig. 10, text-fig. ja. 



1951a Globotruncana area (Cushman) ; Nakkady (pars) : 56-57, pi. 1, fig. 4A, non B-E. 

 1 95 1 Globotruncana (Globotruncana) stuarti (de Lapparent) ; Noth : 78, pi. 8, figs, \ia-c. 

 ? 195 1 Globotruncana (Globotruncana) rosetta (Carsey) ; Noth : 78, pi. 8, figs. i$a-c. 



1951 Globotruncana stuarti (de Lapparent); Tilev (pars) : 34-41, pi. 1, fig. 3, text-figs. ~ja-d, 

 non figs. 8a-d, ga-d (see also Tilev 1952 where figures are repeated). 



1952 Globotruncana stuarti (de Lapparent) ; Sigal : 40, text-fig. 42. 



1Q 55 Globotruncana (Globotruncana) stuarti (de Lapparent) ; Dalbiez : 163-164, Chart 2, 



text-figs. \a-c. 

 *955 Globotruncana stuarti stuarti (de Lapparent), Gandolfi : 64-65, pi. 5, figs. 6a-c. 

 1956 Globotruncana stuarti (de Lapparent) ; Knipscheer : 52, pi. 4, figs. iga-20c, text-figs. 



2, 3- 



1962 Globotruncana (Globotruncana) stuarti stuarti (de Lapparent) ; Pessagno : pi. 2, figs. 1-3. 



Emended diagnosis. A Globotruncana with large, circular, biconvex test ; 

 strongly protruding ventral side, and slightly conical dorsal one ; non-lobate entire 

 periphery, axially strongly acute ; thinned-out, continuous, entirely single keel ; 

 large number of chambers (18-28) increasing constantly and regularly in size 

 and strongly elongated in direction of coiling ; large number of whorls (3-4) and 

 large number of chambers in last whorl (6-7) ; shape of last chambers on dorsal side 

 roughly trapezoidal ; strongly overlapping quadrangular chambers on ventral side ; 

 short, slightly curved, raised beaded sutures on both sides. 



Description. (Specimen, PL 8, figs <\a-d.) Test large, very nearly circular, 

 lenticular, nearly equally biconvex ; dorsal side slightly raised, very broadly and 

 gently conical ; ventral side convex, moderately protruding ; equatorial periphery 



