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 />
(Subbot<strong>in</strong>a trilocul<strong>in</strong>oides) Subzone <strong>of</strong> Berggren & Miller, (1988). At studied<br />
sections only the lower part <strong>of</strong> this subzone is studied which atta<strong>in</strong>s a thickness<br />
<strong>of</strong> 15 meters <strong>in</strong> Sirwan section, 10 meter <strong>in</strong> Qulka <strong>and</strong> Gali sections. The<br />
associated planktonic assemblage <strong>of</strong> this subzone differs from the underly<strong>in</strong>g<br />
P1a Subzone by the presence <strong>of</strong> S. trilocul<strong>in</strong>oides (Plummer), <strong>in</strong> addition to the<br />
follow<strong>in</strong>g <strong>in</strong> Gali section like:<br />
Woodr<strong>in</strong>g<strong>in</strong>a hornerstownensis (Olsson), Chiloguembel<strong>in</strong>a midwayensis<br />
(Cushman), Globoconusa daubjergensis (Bronnimann), Parasubbot<strong>in</strong>a<br />
pseudobulloides (Plummer), Subbot<strong>in</strong>a trivalis (Subbot<strong>in</strong>a), Globanomal<strong>in</strong>a<br />
archeocompressa (blow), G. planocompressa (Shutskaya), Eoglobiger<strong>in</strong>a edita<br />
(Subbot<strong>in</strong>a), E. eobulloides Morozova, Praemurica taurica (Morozova),<br />
P.pseudo<strong>in</strong>constans (blow). In Qulka section slight different were existed <strong>in</strong><br />
planktonic assemblage as below: Chiloguembel<strong>in</strong>a morse (Kl<strong>in</strong>e), Ch.<br />
midwayensis (Cushman), Parasubbot<strong>in</strong>a pseudobulloides (Plummer), Subbot<strong>in</strong>a<br />
trivalis (Subbot<strong>in</strong>a), Globanomal<strong>in</strong>a archeocompressa (blow), G.<br />
planocompressa (Shutskaya), Eoglobiger<strong>in</strong>a edita (Subbot<strong>in</strong>a), E. eobulloides<br />
Morozova, E. simplicissma Blow Praemurica taurica (Morozova),<br />
P.pseudo<strong>in</strong>constans (blow). In Sirwan section similar assemblages were<br />
observed like: Parvularugoglobiger<strong>in</strong>a alabam<strong>in</strong>sis (Liu & Olsson),<br />
Rectoguembel<strong>in</strong>a cretacea Cushman, Woodr<strong>in</strong>g<strong>in</strong>a clytonensis (Loeblich &<br />
Tappan), W. hornerstownensis (Olsson), Chiloguembel<strong>in</strong>a morsei (Kl<strong>in</strong>e), CH.<br />
midwayensis (Cushman), Parasubbot<strong>in</strong>a pseudobulloides (Plummer), Subbot<strong>in</strong>a<br />
trivalis (Subbot<strong>in</strong>a), S. trilocul<strong>in</strong>oides (Plummer), Globanomal<strong>in</strong>a<br />
archeocompressa (blow), G. planocompressa (Shutskaya), Eoglobiger<strong>in</strong>a edita<br />
(Subbot<strong>in</strong>a), E. eobulloides Morozova, Praemurica taurica (Morozova), P.<br />
pseudo<strong>in</strong>constans (blow),<br />
Based on faunal similarities, the comb<strong>in</strong>ed P1 b Subzones <strong>of</strong> studied<br />
section could be equivalent to the upper part <strong>of</strong> Morozovella pseudobulloides<br />
Zone <strong>of</strong> Bolli, (1966), <strong>and</strong> Blow, (1979). To Caron (1985); Elnady & Shah<strong>in</strong>,<br />
(2001), Samir, (2002) from Egypt; Arenillas et al.,(2000) Tunisia; to the P1c <strong>of</strong><br />
Keller, (1988), <strong>and</strong> Keller et al., (1995), <strong>in</strong> Tunisia; to the S. trilocul<strong>in</strong>oides by<br />
Obaidalla, (2005) <strong>in</strong> Egypt; <strong>and</strong> also it is equivalent to the P1b <strong>of</strong> Berggren <strong>and</strong><br />
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