108 UPPER CRETACEOUS-LOWER TERTIARY FORAMINIFERA 



England, and Lehmann (1963) from the Coniacian-Campanian of the Tarfaya 

 province, western Morocco. 



Other authors, by misidentifying Plummer's species, or by confusing it with other 

 subspecies, gave various ranges between Upper Turonian and Lower Maestrichtian, 

 although it was clearly stated (Frizzell 1954) that in the type locality it was not 

 found below the Upper Santonian (base of the Taylor formation) . 



In the Esna-Idfu region Globotruncana fornicata fornicata Plummer floods the 

 basal part of the Sharawna shale formation, characterizing the G. fornicata Zone, to 

 which it is restricted and in which it constitutes, together with its subspecies, the 

 bulk of the planktonic Foraminifera. It fades out gradually upwards in the section 

 disappearing completely below the overlying G. gansseri Zone. 



Globotruncana fornicata globulocamerata subsp. nov. 

 (PL 13, figs, za-c ; PL 14, figs. 2a-c) 



Diagnosis. A Globotruncana fornicata with globigerine character of early 

 chambers extending to most of last whorl, final one or two chambers only are 

 distinctly elongated in direction of coiling. 



Description. (Holotype, PL 14, figs, za-c.) Test medium sized, biconvex, 

 coiled in a low trochospire ; dorsal side gently arched and moderately inflated, 

 ventral side slightly inflated and weakly protruding ; equatorial periphery roughly 

 ovoid, weakly lobate, with two well-developed, much thickened and delicately 

 beaded marginal keels enclosing a relatively wide, slightly inclined peripheral band, 

 which widens out gradually towards the last chamber ; axial periphery distinctly 

 truncate ; chambers on the dorsal side 17, arranged in 3 dextrally coiled whorls ; 

 the initial chambers are exceedingly small, almost indistinct, slightly depressed, 

 globular, weakly inflated, and increase very slowly in size ; they are followed by 

 relatively larger, globular, inflated chambers which increase moderately in size ; the 

 last whorl is composed of 5 large, inflated chambers which are subglobular and increase 

 slowly in size except for the last which is crescentic, strongly elongated in the direc- 

 tion of coiling, and constitutes about \ of the test ; on the ventral side the chambers 

 are 5, large, inflated, subglobular, moderately overlapping and increase slowly is size 

 except the last one which is ovoid, elongated, strongly inflated and constitutes about 

 \ of the test ; sutures on the dorsal side slightly curved, raised and delicately 

 beaded, although the inflation of the chambers on both sides makes them appear to 

 run in very shallow sutural depressions ; on the ventral side the sutures are curved, 

 slightly raised and delicately beaded ; umbilicus irregular in outline, relatively wide, 

 shallow, bordered by slightly raised, delicately beaded ridges and covered by complex 

 tegilla of which remnants are still preserved ; primary apertures interiomarginal, 

 umbilical ; tegilla, with accessory apertures, only poorly preserved ; wall calcareous, 

 perforate except for the imperforate keels, peripheral band and tegilla ; surface 

 slightly rough, delicately papillose especially on the ventral side with the roughness 

 decreasing gradually towards the last chamber. 



