Document Type : Original Research Paper


1 Ph. D. Student, Department of Geology, Faculty of Basic Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 Professor, Department of Geology, Faculty of Basic Sciences, Damavand Branch, Islamic Azad University, Damavand, Iran

3 Assistant Professor, Department of Geology, Faculty of Basic Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran

4 Associate Professor, Department of Geology, North Tehran Branch, Islamic Azad University, Tehran, Iran

5 Ph. D., Departement of Paleontological Studies and Researches, Exploration Directorate of NIOC, Tehran, Iran


Lithostratigraphy and biostratigraphy studies on the Sarvak Formation in type section (Tang- e Sarvak, Northwest of Behbahan) show that this Formation has 710 meter thicknesses that divided in to four lithostratigraphic units. The Sarvak Formation in type section rests on the Kazhdumi Formation conformably with gradational contact (black shales and black argillaceous limestone) and under the Gurpi Formation with disconformity boundary. In this study 8 genus and 9 species of planktonic foraminifera and 34 genera and 33 species of benthic foraminifera have been reported. Four biozones based on (wynd, 1965) and two biozone based on) Premoli Silva and Verga 2004) have been reported as follow; Four biozones based on Wynd 1965:  1- Favusella washitensis range Zone # 23,2- '' Oligostegina''  facies  # 26,3- Rudist debris # 24, 4- Nezzazata– Alveolinids Assemblage Zone #  25, Tow biozones based on Premoli Silva and Verga 2004: 1-Muricohedbergella planispira Zone, 2-Ticinella primula Zone. It can propose an Albian- Cenomanian age for Sarvak Formation based on these biozones and also it can recognize Albian-Cenomanian boundary on occurrence of Muricohedbergella planispira and Whiteinella sp. in lower part of this Formation.


Main Subjects

Adams, A. E., Khalili, M.and Khosravy, A., 1967- Stratigraphic significateof some Oligosteginids Assemblage form Lurestan prorince N. W. Iran. Iranian Oil Operating Companies, 55- 67.
Bolli, H. M., 1945- Zur stratigraphic der Oberen kreide in den hoheren Helvetisehen Dechen. Eclog. Helv. V. 37, 217- 328.
Bolli, H. M., 1959- Planktonic foraminifera from the Cretaceous of Trinidad. Bulletins of American paleontology. V. 39, New York, p. 179.
Bolli, H. M., 1966- Zonation of Cretaceous to Pliocene marine sediments based on planktonic foraminifera Bole Thin Informative Asociacion Venezolana De Geologia. Mineria y peteroleo, V. 9, 3- 32.
Bolz, H., 1977- Reappraisal of the biozonation of the Bangestan Group (Late Aptian- Early Campanian) of southwest Iran. Oil Service Company of Iran, Report No.1252 (Unpublished).
Caron, M., 1983- Taxonomic et. Phylogenic dela famille des Globotruncanidae. Zitteliana Munchen, V. 10, 81- 667.
Caron, M., 1985- Cretaceous Planktic Foraminifera. In: Bolli, H.M., Saunders, J. B., Perch Nielsen, K. (Eds.), Plankton Stratigraphy. Cambridge University press, Cambridge, p. 86.
Ghabeishavi, A., Vaziri- Moghadam, H., Taheri, A. and Taati, F., 2010- Microfacies and depositinal environment of the Cenomanian of the Bangestan anticline, SW Iran. Journal of Asian Earth Sciences, V. 37, 275- 285.
Khalili, M., 1976- the biostratigraphy synthesis of Bangestan Group in S. W. Iran. Iranian Oil Operating Companies, Report No. 1219 (Unpublished).
Loeblich, A. R. And  Tappan, H., 1988- Foraminiferal Genera and their classification. Van Nostrand Reinhold Company, New York, p. 970.
Loeblich, A. R. and Tappan, H., 1961- Cretaceous Planktonic forminofera. micropaleontology, V. 7(3). Part I, p. 257.
Loeblich, A. R. and Tappan, H., 1964- Foraminiferal classification and evolution. Journal of the Geological Society of India, V. 5, 6- 40.
Omidvar, M., Mehrabi, H., Sajjadi, F., Bahramizadeh Sajjadi, H., Rahimpour Bonab, H. and Ashrafzadeh, A., 2014- Revision of the foraminiferal biozonation scheme in Upper Cretaceous carbonates of the Dezful Embayment, Zagros, Iran: Integrated palaeontological, sedimentological and geochemical investigation. Revue de micropaléontologie, V. 238, 1- 20.
Postuma, J. A., 1971- Manual of Planktonic foraminifera. Elsevier, Amsterdam, p. 397.
Premoli- Silva, I and Verga, D., 2004- practical manual of cretaceous planktonic foraminifera, In: Verga, D., Rettori, R. (Eds.), Internation school on Planktonic foraminifera universities of Perugia and Milano. Tipografia pontefelcino, Perugia, Italy, p. 283.
Wynd, J. G., 1965- Biofacies of the Iranian consortium agreement area. Iranian Oil Operating Companies, Report 1082 (unpublished).