Biostratigraphy of Mesozoic-Cenozoic boundary based on calcareous nannofossils in Bulfars section, Southwest Iran
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
To study Mesozoic –Cenozoic boundary based on calcareous nannofossils, section of Tang-e- Bulfars in East Ramhormoz was studied. The fossil groups in determining the relative age of the Mesozoic and Cenozoic layers are important. In this interval, a thickness of 32 meters of shale and limestone were studied and for the first time 35 species of nannofossils were identified. As a result, the identified biozones includes Reinhardtites Levis Zone (UC18/CC24) and the base of Arkhangelskiella cymbiformis (CC25/UC19) with Late Cretaceous age and Heliolithus kleinpellii Zone (NP6) with Selandian/Thanetian age. Based on the identified zones, the transition period of Early Maastrichtian-Selandian/Thanetian and the boundary between the Cretaceous to Paleogene was determined as a discontinuity[z1] . The presence of index species of calcareous nannofossils indicates that the studied sediments in the section of Tang-e- Bulfars were deposited in the lower latitudes and under warm climatic conditions.
Keywords:
Language:
Persian
Published:
Iranian Journal of Geology, Volume:12 Issue: 46, 2018
Pages:
1 to 9
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