Eocene larger benthic foraminifera (alveolinids, nummulitids, and orthophragmines) from the eastern Alborz region (NE Iran): Taxonomy and biostratigraphy implications

Mehdi Hadi, G. Less, Mohammad Vahidinia

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Shallow marine Eocene successions are described and illustrated with major focus on the systematics and biostratigraphic interpretation of larger benthic foraminifera in two stratigraphic sections (Mojen & Kalateh) of the Ziarat Formation from the eastern Alborz zone (Iran). Based on the larger benthic foraminifera assemblages, six shallow benthic zones (SBZ8-SBZ10 and SBZ16?-SBZ17-SBZ18b) during the middle Ilerdian-early Cuisian and Late Lutetian?-Bartonian interval are identified for the first time. The Mojen section is mainly composed of Alveolina horizons as index markers, such as Alveolina decipiens (Schwager), A. tumida (Hottinger), A. ilerdensis (Hottinger), A. sp. cf. A. ilerdensis, A. laxa (Hottinger), A. citrea (Drobne), A. trempina (Hottinger), A. fornasinii (Checchia-Rispoli), A. canavarii (Checchia-Rispoli), A. cf. canavarii and A. aff. cayrazensis, which are consistent with the SBZ8 to SBZ10 interval, whilst the exact age of the top of the interval was not distinctly recognizable. The studied interval of the Kalateh section was assigned to the SBZ16?-SBZ17-SBZ18b with identifications of larger hyaline-lamellar foraminifera represented by Nummulites cf. deshayesi, N. lyelli (D'Archiac & Haime), Orbitoclypeus zitteli (Checchia-Rispoli) and Asterocyclina stella stella (Gümbel).

Original languageEnglish
JournalRevue de Micropaleontologie
DOIs
Publication statusPublished - Jan 1 2019

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benthic foraminifera
biostratigraphy
Eocene
Lutetian
foraminifera
marker
index

Keywords

  • Bartonian
  • Eastern Alborz
  • Ilerdian-Cuisian
  • Larger benthic foraminifera
  • Lutetian
  • Systematic paleontology

ASJC Scopus subject areas

  • Palaeontology

Cite this

@article{956dbf5191a84a83a69efc1fc8c55914,
title = "Eocene larger benthic foraminifera (alveolinids, nummulitids, and orthophragmines) from the eastern Alborz region (NE Iran): Taxonomy and biostratigraphy implications",
abstract = "Shallow marine Eocene successions are described and illustrated with major focus on the systematics and biostratigraphic interpretation of larger benthic foraminifera in two stratigraphic sections (Mojen & Kalateh) of the Ziarat Formation from the eastern Alborz zone (Iran). Based on the larger benthic foraminifera assemblages, six shallow benthic zones (SBZ8-SBZ10 and SBZ16?-SBZ17-SBZ18b) during the middle Ilerdian-early Cuisian and Late Lutetian?-Bartonian interval are identified for the first time. The Mojen section is mainly composed of Alveolina horizons as index markers, such as Alveolina decipiens (Schwager), A. tumida (Hottinger), A. ilerdensis (Hottinger), A. sp. cf. A. ilerdensis, A. laxa (Hottinger), A. citrea (Drobne), A. trempina (Hottinger), A. fornasinii (Checchia-Rispoli), A. canavarii (Checchia-Rispoli), A. cf. canavarii and A. aff. cayrazensis, which are consistent with the SBZ8 to SBZ10 interval, whilst the exact age of the top of the interval was not distinctly recognizable. The studied interval of the Kalateh section was assigned to the SBZ16?-SBZ17-SBZ18b with identifications of larger hyaline-lamellar foraminifera represented by Nummulites cf. deshayesi, N. lyelli (D'Archiac & Haime), Orbitoclypeus zitteli (Checchia-Rispoli) and Asterocyclina stella stella (G{\"u}mbel).",
keywords = "Bartonian, Eastern Alborz, Ilerdian-Cuisian, Larger benthic foraminifera, Lutetian, Systematic paleontology",
author = "Mehdi Hadi and G. Less and Mohammad Vahidinia",
year = "2019",
month = "1",
day = "1",
doi = "10.1016/j.revmic.2019.01.001",
language = "English",
journal = "Revue de Micropaleontologie",
issn = "0035-1598",
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TY - JOUR

T1 - Eocene larger benthic foraminifera (alveolinids, nummulitids, and orthophragmines) from the eastern Alborz region (NE Iran)

T2 - Taxonomy and biostratigraphy implications

AU - Hadi, Mehdi

AU - Less, G.

AU - Vahidinia, Mohammad

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Shallow marine Eocene successions are described and illustrated with major focus on the systematics and biostratigraphic interpretation of larger benthic foraminifera in two stratigraphic sections (Mojen & Kalateh) of the Ziarat Formation from the eastern Alborz zone (Iran). Based on the larger benthic foraminifera assemblages, six shallow benthic zones (SBZ8-SBZ10 and SBZ16?-SBZ17-SBZ18b) during the middle Ilerdian-early Cuisian and Late Lutetian?-Bartonian interval are identified for the first time. The Mojen section is mainly composed of Alveolina horizons as index markers, such as Alveolina decipiens (Schwager), A. tumida (Hottinger), A. ilerdensis (Hottinger), A. sp. cf. A. ilerdensis, A. laxa (Hottinger), A. citrea (Drobne), A. trempina (Hottinger), A. fornasinii (Checchia-Rispoli), A. canavarii (Checchia-Rispoli), A. cf. canavarii and A. aff. cayrazensis, which are consistent with the SBZ8 to SBZ10 interval, whilst the exact age of the top of the interval was not distinctly recognizable. The studied interval of the Kalateh section was assigned to the SBZ16?-SBZ17-SBZ18b with identifications of larger hyaline-lamellar foraminifera represented by Nummulites cf. deshayesi, N. lyelli (D'Archiac & Haime), Orbitoclypeus zitteli (Checchia-Rispoli) and Asterocyclina stella stella (Gümbel).

AB - Shallow marine Eocene successions are described and illustrated with major focus on the systematics and biostratigraphic interpretation of larger benthic foraminifera in two stratigraphic sections (Mojen & Kalateh) of the Ziarat Formation from the eastern Alborz zone (Iran). Based on the larger benthic foraminifera assemblages, six shallow benthic zones (SBZ8-SBZ10 and SBZ16?-SBZ17-SBZ18b) during the middle Ilerdian-early Cuisian and Late Lutetian?-Bartonian interval are identified for the first time. The Mojen section is mainly composed of Alveolina horizons as index markers, such as Alveolina decipiens (Schwager), A. tumida (Hottinger), A. ilerdensis (Hottinger), A. sp. cf. A. ilerdensis, A. laxa (Hottinger), A. citrea (Drobne), A. trempina (Hottinger), A. fornasinii (Checchia-Rispoli), A. canavarii (Checchia-Rispoli), A. cf. canavarii and A. aff. cayrazensis, which are consistent with the SBZ8 to SBZ10 interval, whilst the exact age of the top of the interval was not distinctly recognizable. The studied interval of the Kalateh section was assigned to the SBZ16?-SBZ17-SBZ18b with identifications of larger hyaline-lamellar foraminifera represented by Nummulites cf. deshayesi, N. lyelli (D'Archiac & Haime), Orbitoclypeus zitteli (Checchia-Rispoli) and Asterocyclina stella stella (Gümbel).

KW - Bartonian

KW - Eastern Alborz

KW - Ilerdian-Cuisian

KW - Larger benthic foraminifera

KW - Lutetian

KW - Systematic paleontology

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