Biostratigraphic analysis of Assilina and calcareous nannofossil assemblages from the lower part of the Jahrum Formation (Zagros zone, Iran): insight into systematic of Assilina d'Orbigny
- 1. Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran. E-mail: mehdi_hadi_s@yahoo.com
- 2. Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran. E-mail: parandavar.m@mail.um.ac.ir / National Iranian Oil Company, Exploration Directorate, Sheikh Bahaei Square, Tehran, Iran.
- 3. Department of Geology, Faculty of Sciences, University of Zanjan, Zanjan, Iran. E-mail: majid.mirzaie@znu.ac.ir
- 4. Department of Geology, Payame Noor University, Shiraz, Iran. E-mail: zare.geologist@gmail.com
Description
The present research is a study on the Assilina assemblages which are recorded from the lower part of the Jarum Formation in the Buldaji section, exposed in the Zagros region, southwest Iran. Studies on the systematic analysis and biostratigraphy of these assemblages resulted in diagnosis of three Assilina taxa: A. ex. interc. cuvillieri Schaub, 1981-tenuimarginata Heim, 1908, A. aspera Doncieux, 1948, and A. aff. aspera (Doncieux, 1948), associated with calcareous nannofossil assemblage. Biostratigraphically, we present new data assignable the SBZ13 and NP15/ CNE9-10 zones from the lower part of the Jahrum Formation (Zagros region) pertaining to the central Tethys. This integrated study indicates a precise correlation between Assilina and calcareous nannofossils zonations of the studied interval at a local stratigraphical scale, enabling us to make possible projections for future stratigraphic studies in the vicinity of Tethyan regions.
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