University of Isfahan Journal of Stratigraphy and Sedimentology Researches 2008-7888 26 1 2010 04 21 Forminifera biostratigraphy of the Gurpi and Tarbur formations in northeast Jahrum Forminifera biostratigraphy of the Gurpi and Tarbur formations in northeast Jahrum 89 102 16711 FA Jahanbakhsh Daneshian1 Department of Geology, Science Faculty, Tarbiat Moallem University Leila Fazli2 Department of Geology, Damavand Islamic Azad University Daryush Baghbani Surface Geology office, Exploration section, National Iranian Oil Company Journal Article 2016 06 14 In order to study of stratigraphic distribution and biostratigraphy of foraminifera in the Gurpi and Tarbur Formations, Qutbabad well located at northeast of Jahrum in Fars province have been selected. The Gurpi Formation in Qutabad well composed of 450m argillaceous limestone and conformably overlies the Ilam Formation and unconformably underlies the Tarbur Formation. The Tarbur Formation in Qutbabad well composed of 105m limestone and dolomitic limestone, and recognition 15 genera and 28 species of planktonic foraminifera and 10 genera and 10 species of benthonic foraminifera. On the basis of stratigraphic distribution of index species, the age of the Gurpi Formation’s sediments is Campanian to Maastrichtian and age of the Tarbur Formation is Maastrichtian. Based on occurance and the stratigraphic distribution of planktonic foraminifera the Campanian- Maastrichtian sediments in the Qutbabad well are comparable to Robaszynski and Caron’s biozonation, and 6 biozones were identified. The biozones are as follows: Globotruncanita elevata Partial Range Zone (Early Campanian) Globotruncana ventricosa Interval Range Zone (Middle Campanian) Radotruncana calarata Total Range Zone (Late Campanian) Globotruncanella havanensis Partial Range Zone (Late Campanian) Globotruncana aegyptiaca Interval Range Zone (Late Campanian) Gansserina gansseri Interval Range Zone (late Late Campanian to Maastrichtian) Also the section is comparable with 3 biozones of Wynd’s biozonation : Globotruncanita elevata total range zone (Campanian) Globotruncanita stuarti- Pseudotexutularia varians assemblage zone (Maastrichtian) Omphalocyclus macroporus-Siderolites calcitrapoides- Loftusia sp. assemblage zone (Maastrichtian) In order to study of stratigraphic distribution and biostratigraphy of foraminifera in the Gurpi and Tarbur Formations, Qutbabad well located at northeast of Jahrum in Fars province have been selected. The Gurpi Formation in Qutabad well composed of 450m argillaceous limestone and conformably overlies the Ilam Formation and unconformably underlies the Tarbur Formation. The Tarbur Formation in Qutbabad well composed of 105m limestone and dolomitic limestone, and recognition 15 genera and 28 species of planktonic foraminifera and 10 genera and 10 species of benthonic foraminifera. On the basis of stratigraphic distribution of index species, the age of the Gurpi Formation’s sediments is Campanian to Maastrichtian and age of the Tarbur Formation is Maastrichtian. Based on occurance and the stratigraphic distribution of planktonic foraminifera the Campanian- Maastrichtian sediments in the Qutbabad well are comparable to Robaszynski and Caron’s biozonation, and 6 biozones were identified. The biozones are as follows: Globotruncanita elevata Partial Range Zone (Early Campanian) Globotruncana ventricosa Interval Range Zone (Middle Campanian) Radotruncana calarata Total Range Zone (Late Campanian) Globotruncanella havanensis Partial Range Zone (Late Campanian) Globotruncana aegyptiaca Interval Range Zone (Late Campanian) Gansserina gansseri Interval Range Zone (late Late Campanian to Maastrichtian) Also the section is comparable with 3 biozones of Wynd’s biozonation : Globotruncanita elevata total range zone (Campanian) Globotruncanita stuarti- Pseudotexutularia varians assemblage zone (Maastrichtian) Omphalocyclus macroporus-Siderolites calcitrapoides- Loftusia sp. assemblage zone (Maastrichtian)

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