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- Title
Extending the stratigraphic range of Nummulites bormidiensis Tellini in the Neo-Tethys (Zagros basin, SE Iran) through biometry and calcareous nannofossil biostratigraphy.
- Authors
Hadi, Mehdi; Forouzande, Seyyed Khalil; Consorti, Lorenzo; Parandavar, Mohammad; Vahidinia, Mohammad
- Abstract
Abiometrical study on four reticulate Nummulites populations from the lower part of Asmari Formation of the Vazag section (Zagros zone) is carried out. The biostratigraphy obtained by studing the succession points to the Early Oligocene (Rupelian), indicating shallow benthic zones SBZ21 and SBZ22A by the occurrence of Operculina cf. complanata, Eulepidina formosoides, Nephrolepidina sp. The age assignment is calibrated with calcareous nannofossils biostratigraphy indicating the NP22–NP23 (=CNO2–CNO3) Zones. We have observed a stratigraphic trend related to Nummulites bormidiensis Tellini 1888 that results to be characterized by two populations composed of transitional Nummulites fichteli/bormidiensis with values of mean inner proloculus that exceeds by very little the boundary commonly established at 300 µm. Such a populations, indicated as Nummulites ex interc. bormidiensis et fichteli, span through the lower Rupelian where classically just N. fichteli is reported so far. The stratigraphic distribution ofNummulites bormidiensisis and related transitional forms is here stretched to the Rupelian (SBZ21 and SBZ22A), encompassing older ages than previously recorded throughout the Neo-Tethys Ocean.
- Subjects
IRAN; NANNOFOSSILS; BENTHIC zone; BIOMETRY; MARL; OLIGOCENE Epoch; BIOSTRATIGRAPHY
- Publication
Micropaleontology, 2023, Vol 69, Issue 4, p509
- ISSN
0026-2803
- Publication type
Article
- DOI
10.47894/mpal.69.4.06