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 />
<strong>and</strong> 30 meters <strong>in</strong> Sirwan section. This zone shows reliable abundance <strong>of</strong><br />
Pseudoguembel<strong>in</strong>a hariaensis Nederbragt <strong>and</strong> other assemblages' planktonic<br />
foram<strong>in</strong>ifera which totally resembles that <strong>of</strong> the underly<strong>in</strong>g Racemiguembl<strong>in</strong>a<br />
fructicosa zone (CF4), <strong>in</strong> Gali section with the follow<strong>in</strong>g planktonic forams <strong>of</strong> 50<br />
species like: Heterohelix navarroensis Loeblish, H. globulosa (Ehrenberg), H.<br />
striata (Ehrenberg), H. punctulats (Cushman),H. nauttalli (Voorwijk), H. reussi<br />
(Cyshman), Laeviheterohelix glabrans (Cyshman), Planoglobul<strong>in</strong>a carseyae<br />
(Plummer), P. brazoensis Mart<strong>in</strong>, P. acervul<strong>in</strong>oides (Egger), Rugoglobiger<strong>in</strong>a<br />
rugosa (Plummer), R. scotti (Bronnimann), R. hexacamerata Bronnimann, R.<br />
macrocephala Bronnimann, R. pennyi Bronnimann,R. reicheli Bronnimann, R.<br />
rotundata Bronnimann, Gansser<strong>in</strong>a gansseri (Reuss), Globotruncanita<br />
stuartiformis Dalbez, G. conica White, G. pettersi G<strong>and</strong>olfi, G. angulata<br />
Tilev, Globotruncana aegyptiaca Nakkady, Glt. falsostuarti Sigal, Glt.<br />
dupeublie Caron et al., Glt. lapparenti Boli, Contusotruncana contusa<br />
(Cushman), C. plicata White, C. Patelliformis (G<strong>and</strong>olfi), C. walfischensis<br />
Todd, C. sp. (nov. sp?), Rugotruncana circumnodifer (G<strong>and</strong>olfi),<br />
Globotruncanella petaloidea (G<strong>and</strong>olfi), G. pschadae (Keller), Globiger<strong>in</strong>elloides<br />
volutes (White), G. subcar<strong>in</strong>atus Bronnimann, Pseudotextularia elegans<br />
(Rzehak), P. deformis (kiko<strong>in</strong>e), Racemiguembel<strong>in</strong>a fructicosa (Egger),<br />
Pseudoguembel<strong>in</strong>a costulata (Cushman), P. palpebra, P. excolata (Cushman),<br />
Hedbergella monmothensis (Olsson), H. holmdelensisOlsson, Abathomphalus<br />
mayaroensis (Bolli), Kugler<strong>in</strong>a rotundata (Bronnimann), Costellager<strong>in</strong>a cf.<br />
bulbosa Belford, Gubler<strong>in</strong>a cuvillieri Kiko<strong>in</strong>e, Gumbelitria cretacea Cushman.<br />
The species number <strong>of</strong> planktonic foram<strong>in</strong>ifera <strong>in</strong> this zone is reduced to 45<br />
species at Sirwan section (Fig. 3.1) <strong>and</strong> 40 species <strong>in</strong> Qulka section Dokan area<br />
(Fig. 3.5). While this number shows its relative decreas<strong>in</strong>g to 27 species <strong>in</strong> Kato<br />
section (Fig. 3.3). This zone is recorded only from the marly <strong>and</strong> shaley<br />
limestone layers between the last 12 meters <strong>of</strong> Aqra <strong>in</strong>terf<strong>in</strong>ger<strong>in</strong>g Limestone<br />
with<strong>in</strong> Tanjero Formation which is <strong>in</strong>terrupted 10 meters <strong>of</strong> unfossiliferous<br />
s<strong>and</strong>stone <strong>and</strong> marl. In the upper part <strong>of</strong> Tanjero Formation at Kato section.<br />
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