biostratigraphy and paleoecology of cretaceous/tertiary boundary in ...
biostratigraphy and paleoecology of cretaceous/tertiary boundary in ...
biostratigraphy and paleoecology of cretaceous/tertiary boundary in ...
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Chapter Three Biostratigraphy<br />
meters (Fig. 3.7) (Plate.16; Figs. 7, 8). The recorded planktonic assemblage <strong>of</strong><br />
this zone is characterized by the same number 50 species diversity with<br />
underly<strong>in</strong>g Pseudoguembel<strong>in</strong>a hariaensis zone, <strong>and</strong> marked by the ext<strong>in</strong>ction <strong>of</strong><br />
Heterohelix punctulatus (Cushman), Gansser<strong>in</strong>a gansseri, Globiger<strong>in</strong>elloides<br />
volutes (White), <strong>and</strong> Laeviheterohelix glabrans (Cyshman), at the upper part <strong>of</strong><br />
this zone. Besides, the planktonic foram<strong>in</strong>iferal species endur<strong>in</strong>g from the<br />
underly<strong>in</strong>g Biozones, some species shows their first appearance, e.g.<br />
Globotruncana Falsoscalcarata Kerdany & Abdelsalam, Globotruncanella sp.<br />
<strong>and</strong> Tr<strong>in</strong>itella scotti Bronnimann were appeared for the first time with this zone.<br />
In Qulka section at Dokan area, the Zone (CF2) covers spans (9) meters<br />
(Fig. 3.5) this zone represented by 37 species with the ext<strong>in</strong>ction <strong>of</strong> Gansser<strong>in</strong>a<br />
gansseri (Reuss), Globiger<strong>in</strong>elloides prairiehillensis Pessango at the base <strong>and</strong><br />
Globiger<strong>in</strong>elloides volutes (White), G. subcar<strong>in</strong>ata Bronnimann at the upper part<br />
<strong>of</strong> this zone. The first appearance <strong>of</strong> Rugoglobiger<strong>in</strong>a rotundata Bronnimann at<br />
the base <strong>and</strong> Globotruncana Falsoscalcarata Kerdany & Abdelsalam, at the<br />
upper part <strong>of</strong> this zone.<br />
The Pseudoguembel<strong>in</strong>a palpebra Interval Zone (CF 2) <strong>in</strong> Sirwan valley<br />
displays spans 25 meters (Fig. 3.1), biostratigraphically represented by<br />
decreas<strong>in</strong>g species number from 49 to 38 species <strong>and</strong> there is no any dist<strong>in</strong>ctive<br />
appearance <strong>of</strong> new species with this zone. The planktonic foram<strong>in</strong>iferal<br />
assemblages <strong>of</strong> this zone <strong>in</strong> Sirwan section represented by Heterohelix<br />
navarroensis Loeblish, H. globulosa (Ehrenberg), Laeviheterohelix glabrans<br />
(Coshman), Planoglobul<strong>in</strong>a carseyae (Plummer), P. acervul<strong>in</strong>oides (Egger),<br />
Rugoglobiger<strong>in</strong>a rugosa (Plummer), R. scotti (Bronnimann) , R. hexacamerata<br />
Bronnimann, R. macrocephala Bronnimann, R. pennyi Bronnimann, R. reicheli<br />
Bronnimann, Globotruncanita stuartiformis Dalbez , G.conica White ,<br />
Globotruncana aegyptiaca Nakkady, Glt. Falsocalcarata Kerdany &<br />
Abdelsalam, Glt. falsostuarti Sigal, Glt. dupeublie Caron et al., Glt. lapparenti<br />
Boli, Contusotruncana contusa (Cushman), C. plicata White, C. walfischensis<br />
Todd, Rugotruncana circumnodifer (G<strong>and</strong>olfi), R.subcircumnodifer (G<strong>and</strong>olfi),<br />
Globotruncanella petaloidea (G<strong>and</strong>olfi), G. pschadae (Keller), Globiger<strong>in</strong>elloides<br />
prairiehillensis Pessango, Pseudotextularia elegans (Rzehak), P.deformis<br />
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