Revision of Middle Devonian conodont biostratigraphy in the Negheleh section, Central Iran

Hossein Gholamalian; Vachik Hairapetian; Mohammad Poosti

doi:10.4072/rbp.2021.4.02

Revision of Middle Devonian conodont biostratigraphy in the Negheleh section, Central Iran

Autores/as

Hossein Gholamalian Department of Geology, Faculty of Sciences, University of Hormozgan, Po. Box 3995, Bandar Abbas, I.R. Iran.
Vachik Hairapetian Department of Geology, Islamic Azad University, Khorasgan (Esfahan) Branch, Esfahan, I.R. Iran
Mohammad Poosti Department of Geology, Faculty of Sciences, University of Hormozgan, Po. Box 3995, Bandar Abbas, I.R. Iran.

DOI:

https://doi.org/10.4072/rbp.2021.4.02

Resumen

Fifteen conodont species and subspecies from the Negheleh section, Soh area, north of Esfahan represent early Eifelian to middle Givetian time interval. Five biozones: costatus to australis, kockelianus, ensensis to hemiansatus, timorensis and rhenanus to ansatus are recognized. The present study suggests the Eifelian age for the base of Bahram Formation in the Sanandaj-Sirjan and the western part of Central Iran Microplate. The oldest known occurrence of thelodont turiinid species, Neoturinia hutkensis is reported from the early Eifelian strata of the Negheleh section. New age range from the late Eifelian to late Frasnian is proposed for Icriodus excavatus Weddige.

Keywords: Middle Devonian, Eifelian, Givetian, conodonts, biostratigraphy.

RESUMO – Quinze espécies e subespécies de conodontes da seção Negheleh, área de Soh, ao norte de Esfahan representam o intervalo de tempo Eifeliano inferior a Givetiano médio. Cinco biozonas: costatus a australis, kockelianus, ensensis a hemiansatus, timorensis e rhenanus a ansatus são reconhecidas. O presente estudo sugere a idade Eifeliana para a base da Formação Bahram em Sanandaj-Sirjan e na parte ocidental da Microplaca Central Iraniana. A ocorrência mais antiga conhecida da espécie turiinidae thelodonte, Neoturinia hutkensis, é relatada nos estratos eifelianos da seção Negheleh. Uma nova faixa de idade do Neoeifeliano ao Neofrasniano é proposta para Icriodus excavatus Weddige.

Palavras-chave: Devoniano Médio, Eifeliano, Givetiano, conodontes, bioestratigrafia.

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Publicado

2022-02-22

Cómo citar

Gholamalian, H., Hairapetian, V., & Poosti, M. (2022). Revision of Middle Devonian conodont biostratigraphy in the Negheleh section, Central Iran. Revista Brasileira De Paleontologia, 24(4), 311–322. https://doi.org/10.4072/rbp.2021.4.02

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Número

Vol. 24 Núm. 4 (2021): Revista Brasileira de Paleontologia

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