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Chapter Three Biostratigraphy Silva and Sliter, 1995, 1999) from Italy. (Abdel-Kareem & Samir. 1995), Egypt. (Fig. 3.12) The Pseudotextularia intermedia Zone spans about 0.73Myr (69.06- 68.33Ma), (730Ky/19) meters estimating absolute ages based on magnetochron ages with (38.5 Ky/meter) of moderate rate of deposition (Fig.3. 12 – 3. 13), (Fig,5.11) Age: Late Early Maastrichtian. Note: it is important to mention that the Pseudotextularia intermedia Zone was recorded also from the other studied sections (only the upper part) in which the lower limit not studied. This biozone represented by moderate diversity of planktonic foraminiferal assemblage by 43 species in Sirwan section, (Fig.3.1), 44 species in Qulka section (Fig.3.5) and Low diversity planktonic foraminiferal assemblage by (27) species in Qishlagh section, (Fig.3.4) 3.2.1.5- Racemiguembelina fructicosa Interval Zone (CF4) Racemiguembelina fructicosa zone (CF4) was introduced by Li and Keller (1998 a and b) as a biostratigraphic interval between FAD of Racemiguembelina fructicosa (Egger) at the base and the FAD of Pseudoguembelina hariaensis at the top. The FAD of Racemiguembelina fructicosa (Egger) in the studied section recorded from the upper most part of reddish to pale brown unit and covers the basal part of the Tanjero Formation (sample no.38) to the FAD of Pseudoguembelina hariaensis Nederbragt within Tanjero Formation (sample no.58). (plate. 1, Fig. 9). Attaining a thickness of 23m. at Gali section (Fig 3.7) 110 meters Sirwan section (Fig 3.1) 32 meters Kato section (Fig 3.3) 83 meters Qulka section (Fig 3.5), while the upper limit of this zone in Qishlagh section not recorded due to change of environmental parameters which is represented by thick bedded interfingering limestone of Aqra Formation at the upper part of Tanjero Formation It is important to mention that the zonal scheme of Cretaceous foraminifera (CF) proposed by Li and Keller (1998 a&b), which replaces the Abathomphalus mayaroensis zone with four zones (R. fructicosa zone, P. hariaensis Zone, P. palpebra Zone, P. hantkeninoides Zone), for a much improved age estimate for 60
Chapter Three Biostratigraphy the late Maastrichtian (Fig. 3.12). The total range zone of A. mayaroensis Zone characterized the Upper Maastrichtian in low latitude regions as well as the Tethyan paleogeographic realm. However it has been found that A. mayaroensis is very rare or absent in high latitude regions (Blow, 1979) and in the present section also, consequently it is more accurate to use the new zonal scheme. Most of the workers in the zonal scheme placed Racemiguembelina fructicosa zone at the lower Late Maastrichtian (Li and Keller, 1998a&b), (Abramovich et al., 2002), at DSDP Site 525A. (Keller et al., 1995), from Tunisia. (Obaidalla 2005), and (Samir 2002), Egypt. As defined above, the present Biozone (CF4) is correlatable with the lower part of A. mayaroensis of (Abawi et al., 1982 and Abdel-Kareem 1986), (Premoli Silva and Sliter 1995, 1999),Italy. (Caron 1985), and (Robaszynski et al., 1984), general. (Fig. 3.12). This zone covered abundant occurrence of the nominate species, in addition to the index planktonic 55 species identified from Gali section, e.g: Heterohelix navarroensis Loeblish, H. globulosa (Ehrenberg), H. striata (Ehrenberg), H. punctulats (Cushman), H. nauttalli (Voorwijk), H. reussi (Cyshman), H. pulchra (Brotzen) , Planoglobulina carseyae (Plummer), P. brazoensis Martin, P. acervulinoides (Egger), Rugoglobigerina rugosa (Plummer), R. scotti (Bronnimann), R. hexacamerata Bronnimann, R. macrocephala Bronnimann, R. pennyi Bronnimann, R. milamensis Smith & Pessango, R. reicheli Bronnimann, Gansserina gansseri (Reuss), Globotruncanita stuartiformis Dalbez, G. conica White, G. pettersi Gandolfi, G. angulata Tilev, Globotruncana aegyptiaca Nakkady, Glt. falsostuarti Sigal, Glt. dupeublie Caron et al., Glt. lapparenti Boli, Glt. arca (Cushman), Contusotruncana contusa (Cushman), C. plicata White, C. Patelliformis (Gandolfi), C. walfischensis Todd, C. sp. (nov. sp?), Rugotruncana circumnodifer (Gandolfi), R. subcircumnodifer (Gandolfi), Globotruncanella petaloidea (Gandolfi), G. pschadae (Keller), Globigerinelloides volutes (White), G. subcarinatus Bronnimann, G. prairiehillensis Pessango, Pseudotextularia elegans (Rzehak), P. deformis (kikoine), P. intermedia (De Klasz), Racemiguembelina fructicosa (Egger), R. poweli Smith & Pessango, Pseudoguembelina costulata (Cushman), P. palpebra, P. excolata (Cushman), Hedbergella 61
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BIOSTRATIGRAPHY AND PALEOECOLOGY OF
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IV Dedicated: To My Wife My Daughte
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VI Abstract The Cretaceous / Tertia
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VIII successions from the upper par
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3.2.1.4- Pseudotextularia intermedi
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XII Table No. Title Page Table (3.1
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XIV Fig (4.11): Sedimentation rate
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Chapter one Introduction such as pl
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Chapter one Introduction Fig. (1.1)
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Chapter one Introduction lithologic
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Chapter one Introduction The Shiran
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Chapter Four Depositional Environme
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Chapter Five CHAPTER FIVE Conclusio
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Chapter Five Conclusion Paleontolog
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Chapter Five Conclusion (Late Maast
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Chapter Five Conclusion E- Kato sec
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Chapter Five Conclusion 16- The ter
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REFERENCES Abawi, T. S. Abdel-Kiree
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Northwestern Iraq. Rafidain Journal
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Bandy, O. L., 1967. Cretaceous plan
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limestone from the accretionary pri
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Cretaceous of the south Constantine
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James, G. A. and Wynd, J. G., 1965.
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Kassab, I. I. M., 1975c. Planktonic
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Liu, C. and Olsson, R. K., 1992. Ev
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Molina, E. Arenillas, I. and Arz, J
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Petters, S. W. EL-Nakhal, H. A. and
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Sissakian, V. K., 2000. Geological
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EXPLANATION OF THE PLATES PLATE -1
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PLATE -3 Scale bar represents magni
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PLATE -11 Scale bar represents magn
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PLATE -17 Figs 1- 3 Globotruncana a
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PLATE -19 Figs. 1 Gansserina wieden
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PLATE -21 Figs 1-2 Abathomphalus ma
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PLATE -23 Fig. 1 Globigerinelloides
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