Biozonation and Paleobathymetry on Foraminifera Upper Cretaceous Deposites of Central Iran Basins (Isfahan, Baharestan Section)


In this study Late Cretaceous stratum in central Iran, Baharestan section in Isfahan area, was evaluated by biozonation and paleobathymetry. These sediments have 89 meters thick, and strata have been formed of marl and marl limestone. In order to indicate the ancient depth of Upper Cretaceous at this time, planktonic and benthic foraminifera were studied. The percentage of the total planktonic foraminifera to the whole sample of foraminifera after the removal of indwell benthic foraminifera (%P*) using the formula D = e(3.58718 + (0.03534 × %P*)) was identified and depth of 200 - 450 meters was achieved for them. In the present investigation, 30 planktonic species of 11 genus have been identified. The Upper Cretaceous deposit was divided to 6 biozones on the basis of planktonic foraminifera which are cosmopolitan and consist of: Biozone 1—Marginotruncana sigali-Dicarinella primitiva partial range zone; Biozone 2—Dicarinella concavata interval zone; Biozone 3—Dicarinella asymetrica total range zone; Biozone 4—Globotruncanita elevata partial range zone; Biozone 5—Globotruncana ventricosa interval zone; Biozone 6—Radotruncana calcarata interval zone. Based on planktonic foraminifera, the Upper Cretaceous sediments in the study area are of the Turonian-Late Campanian ages.

Share and Cite:

Shirazi, B. , Bakhshandeh, L. and Yazdi, A. (2014) Biozonation and Paleobathymetry on Foraminifera Upper Cretaceous Deposites of Central Iran Basins (Isfahan, Baharestan Section). Open Journal of Geology, 4, 343-353. doi: 10.4236/ojg.2014.48026.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Aghanabati, A. (2005) Iran’s Geology, Geological Survey of Iran.
[2] Loeblich Jr., A.R. and Tappan, H. (1988) Foraminiferal General and Their Classification: Van Nostrand Reinhold Company, New Yourk, 2 Volumes, 970 p.
[3] Robaszynski, F. and Caron, M. (1995) Foraminiferes planctoniques du Cretace: Commentaire dela zonation Europe-Mediterrane. Bulletin de la Societe Geologique de France, 166, 681-692.
[4] Robaszynski, F., Caron, M., Gonzales Donoso, J.M. and Wonders, A.A.H. (1984) Atlas of Late Cretaceous Globotruncanids. Revue de Micropaléontologie, 26, 145-305.
[5] Premoli Silva, I. and Verga, D. (2004) Practical Manual of Cretaceous Planktonic Foraminifera, Course 3. In: Verga, D. and Rettori, R., Eds., International School on Planktonic Foraminifera: Universities of Perugia and Milano, Tipografiadi di Pontefelcino, Perugia, 283 p.
[6] Bolli, H.M., Beckman, J.P. and Saunders, J.B. (1994) Benthic Foraminiferal Biostratigraphy of the South Caribbean Region. Cambridge University, Cambridge.
[7] Bolli, M.H., Saunders, J.B. and Perch-Nielsen, K. (1985) Plankton Stratigraphy. Vol. I. Cambridge University Press, Cambridge, 87-154.
[8] Li, L. and Keller, G. (1999) Variability in Late Cretaceous Climate and Deep Waters: Evidence from Stable Isotopes. Marine Geology, 161, 171-190.
[9] Caron, M. (1985) Cretaceous Planktonic Foraminifera. In: Boli, et al., Plankton Stratigraphy, Cambridge University Press, Cambridge, 17-86.
[10] Van der Zwaan, G.J., Jorissen, F.J. and De Stigter, H.C. (1990) The Depth-Dependency of Planktonic/Benthic Foraminiferal Ratios; Constraints and Applications. Marine Geology, 95, 1-16.
[11] Van der Zwaan, G.J., Duijnstee, I.A.P., Den Dulk, M., Ernst, S.R. and Kouwenhoven, N.T. (1999) Benthic Foraminifers: Proxies or Problems? A Review of Paleoecological Problems. Earth-Science Reviews, 46, 213-236.
[12] Holbourn, A., Kuhnt, W. and Soeding, E. (2001) Atlantic Paleobathymetry, Paleoproductivity and Paleocirculation in the Late Albian: The Benthic Foraminiferal Record. Palaeogeography, Palaeoclimatology, Palaeoecology, 170, 171- 196.
[13] Sliter, W.V. and Leckie, R.M. (1993) Cretaceous Planktonic Foraminifers and Depositional Environments from the Ontong Java Plateau with Emphasis on Sites 803 and 807. In: Berger, W.H., Kroenke, L.W., Mayer, L.A., et al., Proceedings ODP Science Results, 130, 63-84.
[14] Li, L., Keller, G. and Stinnesbeck, W. (1999) The Late Campanian and Maastrichtian in Northwestern Tunisia: Paleoenvironmental Inferences from Lithology, Macrofauna and Benthicforaminifera. Cretaceous Research, 20, 231-252.

Copyright © 2023 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.