Calcareous nannofossil biostratigraphy of Baghamshah Formation in Eastern Iran, Lut Block (Birg Section)

Authors

  • Ensieh Behdani Stratigraphy and Paleontology, Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran.
  • Fatemeh Hadani Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran.
  • Marziyeh Notghi Moghaddam Department of Geology, Payame Noor University, Tehran, I.R of Iran.
  • Ahmadreza Khazaei Department of Geology, University of Birjand, Birjand, Iran.

DOI:

https://doi.org/10.4072/rbp.2022.1.04

Abstract

Biostratigraphic studies of the Baghamshah Formation from the Birg section in the northwest of Birjand (Lut Block) are done here for the first time based on the calcareous nannofossils. In the studied section, 82 samples were taken, and smear slides were prepared. The examination of the collected samples resulted in the identification of 65 calcareous nannofossil and 11 didemnid ascidian spicules species belonging to 38 genera corresponding from CC1 to CC4b biozones with the age of early Berriasian to early Hauterivian, according to the Sissingh biozonation. The calcareous nannofossil assemblages are dominated by the following genera: Watznaueria, Nannoconus,
Conusphaera, and Cyclagelosphaera.

Keywords: Birjand, Baghamshah Formation, biozonation, Biostratigraphy, Early Berriasian, Early Hauterivian.

RESUMO – Estudos bioestratigráficos da Formação Baghamshah da seção Birg no noroeste de Birjand (Lut Block) são descritos aqui pela primeira vez com base nos nanofósseis calcários. No setor estudado, foram retiradas 82 amostras e preparadas lâminas de esfregaço. O exame de amostras coletadas resultou na identificação de 65 espécies de nanofósseis calcários e 11 espécies de espículas de ascídia didenídeos pertencentes a 38 gêneros correspondentes às biozonas CC1 a CC4b com a idade do início de Berriasiano ao início de Hauteriviano, de acordo com a biozonação de Sissingh. As associações de nanofósseis calcários são dominadas pelos seguintes gêneros: Watznaueria, Nannoconus, Conusphaera e Cyclagelosphaera.

Palavras-chave: Birjand, Formação Baghamshah, biozonação, Bioestratigrafia, Berriasiano Inferior, Hauteriviano Inferior.

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Published

2022-04-12

How to Cite

Behdani, E., Hadani , F. ., Notghi Moghaddam, M. . ., & Khazaei , A. . (2022). Calcareous nannofossil biostratigraphy of Baghamshah Formation in Eastern Iran, Lut Block (Birg Section). Revista Brasileira De Paleontologia, 25(1), 51-60. https://doi.org/10.4072/rbp.2022.1.04