Document Type : Original Research Paper


1 Ph.D. Student, Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran

2 Professor, Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran

3 Assistant Professor, Department of Geology, Payame Noor University, Tehran, Iran

4 Associate Professor, Department of Geology, Birjand University, Birjand, Iran


In the present study, Baghamshah Formation in Baghdadeh section located in the eastern margin of Lut Block to biostratigraphic studies based on calcareous nannofossils was sampled. Thickness of Baghamshah Formation in this section is 253m and mainly contains of shale and marl. According to the paleontological studies, 43 nannofossil species belong to 20 genera with well to moderate preservation in Baghdadeh section were identified and photographed. Based on the index calcareous nannofossils and assemblages species, CC1-CC5 biozones of Sissingh (1977) were determined. According to determined biozones, age of the Baghamshah Formation in Baghdadeh section Early Berriasian to Early Barremian was suggested.


Main Subjects

Aghanabati, A., 1977 - Étude géologique de la région de Kalmard (w. Tabas). - Geological Survey of Iran Report 35, 1- 230.
Applegate, J. L. and Bergen, J. A., 1988- Cretaceous calcareous nannofossil biostratigraphy of sediments recovered from the Galicia Margin, ODP Leg 103. In Boillot, G., Winterer, E.L., et al., Proc. ODP, Sci. Results, 103: College Station, TX (Ocean Drilling Program), 293–348.
Bown, P. R. and Young, J. R., 1997- Mesozoic calcareous nannoplankton classification. J. Nannoplankton Res., 19: 21–36.
Bronnimann, P., 1955- Microfossils incertae sedis from the Upper Jurassic and Lower Cretaceous of Cuba. Micropaleontology, 1: 28-51.
Hashemi-Yazdi, F. and Sajjadi, F., 2015- A new lycophyte miospore species from the Middle jurassic of  Iran, Rev. bras. paleontol. 2: 251-260.
Kallanxhi, E., Falahatgar, M., Javidan, M., Sarfi, M. and Parvizi, T., 2016- Calcareous nannofossils- and ammonites-based biostratigraphy of the Baghamshah Formation (Central Iran Basin, Iran). Studia UBB Geologia 1: 29 – 42.
Mukherjee, D. and Fürsich, F. T., 2014- Jurassic brachiopods from east-central Iran. Beringeria44: 107-127, 9 textfis., 9 tabs, 2 pls; Erlangen.
Nowroozi, A. A., 1972- Focal mechanism of earthquakes in Persia, Turkey, West Pakistan and Afghanistan and plate tectonics of the Middle East. Bulletin of Seismological Society America, 62 (3): 823- 850
Pandey, D. K. and Fürsich, F. T., 2003- Jurassic corals of east-central Iran. Beringeria, Heft 32,138pp.
Perch-Nielsen, K., 1983- Recognition of Cretaceous stage boundaries by means of calcareous nannofossils. In: Birkelund, T., et al., (eds.), Symposium on Cretaceous Stage Boundaries, Copenhagen, Abstracts, 152-156.
Perch-Nielsen, K., 1985- Mesozoic calcareous nannofossils. In Bolli, H.M., Saunders, J.B., and Perch-Nielsen, K. (Eds.), Plankton Stratigraphy: Cambridge (Cambridge Univ. Press), 329–426.
Roth, P. H., 1978- Cretaceous nannoplankton biostratigraphy and oceanography of the northwestern Atlantic Ocean. In Benson, W.E., Sheridan, R.E., et al., Init.Repts. DSDP, 44: Washington (U.S. Govt. Printing Office), 731–759.
Roth, P. H., 1983- Jurassic and Lower Cretaceous calcareous nannofossils in the western North Atlantic (Site 534): biostratigraphy, preservation, and some observations on biogeography and paleoceanography. In Sheridan, R.E., Gradstein, F.M., et al., Init.Repts. DSDP, 76: Washington (U.S. Govt. Printing Office), 587–621.
Seyed-Emami, K., Chairer, S. G. and Aghanabati, S. A., 1997- Ammonitenaus der Baghamshah Formation (Callov, Mittlerer Jura), NW Tabas (Zentraliran). Mitteilungen der Bayerischen Staatssammlung fur Palaeontologie und historische Geologie, 37: 24–40.
Seyed-Emami, K., Fürsich, F. T. and Schairer, G., 2001- Lithostratigraphy, ammonite faunas and palaeoenvironments of Middle Jurassic strata in North and Central Iran. - Newsletters on Stratigraphy 38: 163-184.
Seyed-Emami, K., Fursich, F. T. and Wilksen, M., 2004- Documentation and significance of tectonic events in the northern Tabas Block (east – central Iran) during the Middle and late Jurassic. Riv. Ital. Paleont. Strat. 1: 163-171.
Seyed-Emami, K., Fursich, F. T. and Wilksen, M., 2006- New evidence on the lithostratigraphy of the Jurassic System in the northern Tabas Block, east-central Iran. Geosciences, 15: 75–97.
Seyed-Emami, K., Schairer, G., Aghanabati, A. and Fazl, M., 1991- Ammoniten aus dem Bathon von Zentraliran (TabasNayband Region).- Müncher Geowiss. Abhandlungen A,19, 65-100.
Seyed-Emami, K., Schairer, G., FÜrsich, F. T., Wilmsen, M. and Majidifard, M. R., 2002- Reineckeidae (Ammonoidea) from the Callovian (Middle Jurassic) of the Shotori Range (East Central Iran). Neues Jahrbuch für Geologie und Paläontologie, Monatshefte, 3: 184-192.
Sissingh, W., 1977- Biostratigraphy of Cretaceous calcareous nannoplankton. Geol. Mijnbouw, 56:37–65.
Stocklin, J. and Nabavi, M. H., 1973- Tectonic map of Iran. Geological Survey of Iran.
Stocklin, J., 1968- Structural history and tectonics of Iran: A review American Association Petrology. Geologists Bulletin, 7: 1229-1258.
Stocklin, J., 1972- Lexique Stratigraphique International. Geological Survey of Iran, Fascicule 9b, Iran
Stocklin, J., Eftekhar-Nezhad,J. and Hushmand-Zadeh, A., 1965- Geology of the Shotori Range (Tabas area, East Iran). Geol. Surv. Iran Rep. 3, 69pp.
Taylor, R., 1982- Lower Cretaceous calcareous nannofossils. In: Lord, A.R. (ed.), A stratigraphical index of calcareous Nannofossils. British Micropaleontology Society, 40-80.
Thierstein, H. R., 1971- Tentative Lower Cretaceous calcareous nannoplankton zonation.Eclogae Geol. Helv., 64:458–488.
Thierstein, H. R., 1973- Lower Cretaceous calcareous nannoplankton biostratigraphy.Abh. Geol. Bundesanst. (Austria), 29:1–52.
Thierstein, H. R., 1976- Mesozoic calcareous nannoplankton biostratigraphy of marine sediments. Mar. Micropaleontol., 1:325–362.
Wilmsen, M., Fürsich, F. T., Seyed-Emami, K. and Majidifard, M. R., 2009- An overview of the stratigraphy and facies development of the Jurassic System on the Tabas Block, east-central Iran. Geological Society, London, Special Publications 312: 323–343.