Hamed Yarahmadzahi

Islamic Azad University, Zahedan Branch

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Daniel Vachard

Centre National de la Recherche Scientifique

E. Ja. Leven

Geological Institute

Mahnaz Amirshahkarmi

Payame Noor University

Félix Schlagintweit

Film Independent

Hossain Ahmadi

Payame Noor University

Koorosh Rashidi

Yazd University

M. N. Gorgij

University of Sistan and Baluchestan

Andrej Ernst

Universität Hamburg

Sharam Habibimood

Islamic Azad University, Zahedan Branch

Zoya Tolokonnikova

Kuban State University

Cooperative Institutions

Islamic Azad University, Science and Research Branch

Payame Noor University

Geological Survey of Iran

Universität Hamburg

Islamic Azad University, Zahedan Branch

Bridge University

Centre National de la Recherche Scientifique

Unité Évolution, Écologie et Paléontologie

Université de Lille

Universidad Complutense de Madrid

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Lower Permian smaller foraminifers from the Rahdar section, Central Iran

Stratigraphy and Geological Correlation (2015)

Т. V. Filimonova M. N. Gorgij Hamed Yarahmadzahi E. Ja. Leven

Section (typography)

10.1134/s086959381503003x

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Citations (0)

First report of the benthic foraminifera from Maastrichtian in the Eastern of Iran (Tutak section)

Annales de Paléontologie (2024)

Hamed Yarahmadzahi Mohammadsadegh Dehghanian Shahram Habibi Mood

Section (typography)

10.1016/j.annpal.2024.102667

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Citations (0)

DISSOCLADELLA? CHAHTORSHIANA RASHIDI & SCHLAGINTWEIT N. SP., A NEW DASYCLADALE (GREEN ALGAE) FROM THE PALEOCENE OF IRAN

Acta Palaeontologica Romaniae (2019)

Félix Schlagintweit Koorosh Rashidi Hamed Yarahmadzahi Sharam Habibimood Mahnaz Amirshahkarmi

A new Dasycladale is described as Dissocladella? chahtorshiana Rashidi & Schlagintweit n. sp. from Selandian carbonates of Mount Chah Torsh, Central Iran (type locality). Other occurrence is from the Sistan Suture Zone of Eastern Iran (Selandian?, Thanetian?). The medium-sized taxon displays cylindrical to slightly claviform thalli with a relatively large main axis bearing alternating primaries of variable shape. The latter show either slowly widening towards the distal end or are club-shaped displaying very short secondaries. The morphological variability of the primaries, both typical and atypical for Dissocladella, account for some doubts on the generic assignment of the new species. Dissocladella? chahtorshiana occurs in bioclastic packstones with Cymopolia mayaense Johnson & Kaska, Acroporella cf. anceps Segonzac, Halimeda sp., and benthic foraminifera (e.g., soritiids) at its type locality.

Halimeda

Thallus

Type locality

10.35463/j.apr.2019.02.01

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Citations (4)

<i>Mackinneyella</i> (Morozova and Lisitsyn, 1996) Fenestrate Genus Described for the First Time from the Devonian Deposits

Open Journal of Geology (2013)

Hamed Yarahmadzahi Andrej Ernst Zoya Tolokonnikova Behrooz Sahebzadeh

Mackinneyella fenestrate genus has been reported first time from Lower Permian, Southern Urals (Russia) and then was found Lower Carboniferous to upper permian deposits from Australia, USA, Mongolia, China, Japan, Thailand and Tasmania. This genus is described for the first time from the Devonian deposits of the Kale Sardar section in Tabas area, Central Iran.

Devonian

Southern china

Section (typography)

10.4236/ojg.2013.34034

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The uppermost Carboniferous (Gzhelian)–Lower Permian (Asselian–Sakmarian) stratigraphy and smaller foraminifers of the Ozbak‐Kuh region (Tabas Block, east central Iran)

Geological Journal (2017)

Hamed Yarahmadzahi Daniel Vachard

The uppermost Carboniferous (Gzhelian)–Lower Permian (Asselian to Sakmarian) Anarak Group of the Zaladou section in central Iran is more than 180‐m thick and includes thick units of shale, calcareous sandstone, fusulinid limestone, sandy limestone, and dolomite. The Zaladou and Tigh‐e‐Madanu formations of this group were dated as Gzhelian to Sakmarian. A review of the smaller foraminifers of the Zaladou section is presented. Five foraminiferal subzones grouped in three biozones are proposed in this work: The first assemblage zone (I) is Gzhelian; the second zone (II) corresponds to the Gzhelian–Asselian boundary interval, and the third biozone (III) is Asselian in age. Biozone I is subdivided informally into two subzones: the Hemigordius spirilliniformis ‐ Bradyina cf. samarica subzone IA (probably early Gzhelian in age) and the Raphconilia modificata and Globivalvulina spp. subzone IB (middle to late Gzhelian); biozone II is the Nodosinelloides spp. zone; biozone III is subdivided informally into two subzones: IIIA with Pseudoacutella partoazari ‐ Bradyina lucida and IIIB with Planoendothyra persica n. sp.‐ Rectogordius sp. The studied assemblages are correlated with those from the Carnic Alps (Austria–Italy), East European Platform of Russia, the Urals (Russia), Darvas (Uzbekistan), the northern and central Pamirs (Tajikistan), northern Iran (Alborz), northern Afghanistan, and other classical regions of the Tethyan realm. The genera Raphconilia and Planoendothyra are revised, and Planoendothyra persica n. sp. is described.

Biozone

10.1002/gj.2909

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Citations (5)

Moscovian–asselian (middle Pennsylvanian–earliest Cisuralian) Smaller Foraminifers from the Asad-abad Section (sanandaj-sirjan Zone, Central Iran)

The Journal of Foraminiferal Research (2019)

Hamed Yarahmadzahi Daniel Vachard

Abstract Carboniferous and Permian strata crop out in Central Iran. The Asad-Abad section has yielded Gzhelian and Asselian fusulinid levels. Here we describe the smaller foraminifers of this section for the first time and introduce four biozones based on these taxa. Biozone I with Monotaxinoides? melanogaster n. sp. is interpreted to be early?-middle? Gzhelian in age (with possible reworkings affecting up to Moscovian/Kasimovian? levels) based upon the principle of superposition and of previous datings of the underlying series, but in the absence of direct datings by fusulinids of this lowermost part of the section. Further, Monotaxinoides? are generally known in the Bashkirian-Moscovian. Biozone II includes Raphconilia spp., Protonodosaria spp., and Rectogordius? minimus n. sp. and is interpreted as middle?-late Gzhelian in age. Biozone III includes Turrispiroides spp., Calcivertella anguinea, Calcitornella heathi, and Vervilleina crescenticamerata n. sp., and we base its early Asselian age on associated fusulinids. Finally, Biozone IV includes Cribrogenerina? sp. and Nodosinelloides longissima; its middle to late Asselian age, based on fusulinids, is confirmed by associated smaller foraminifers. The foraminiferal assemblages display marked differences in composition and stratigraphic distribution compared with those of Alborz and Tabas Block. Principally, they have unexpected similarities with several North American assemblages, especially the three new species: Monotaxinoides? melanogaster n. sp., Rectogordius? minimus n. sp., and Vervilleina crescenticamerata n. sp.

Biozone

Section (typography)

10.2113/gsjfr.49.2.107

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Citations (6)

Gzhelian (latest Carboniferous) Pseudoacutella partoazari foraminiferal assemblage from the Tabas Block (Central Iran)

Carnets de géologie (Notebooks on geology) (2023)

Hamed Yarahmadzahi Daniel Vachard

A foraminiferal assemblage is reported from the Zaladou Formation in the Tabas Block (Shishtu Section), Central Iran. This assemblage comprises 16 species belonging to 14 genera, and encompasses the fusulinids Pseudoacutella partoazari, Grovesella tabasensis, Gr. aff. australis, Gr. sphaerica, Gr. sphaerica var. quadrata, Gr. cf. staffelloides, Schubertina sp., Schubertella sp., and the smaller foraminifers Eotuberitina sp., Lasiodiscus tenuis, Raphconilia cf. minor, R. multihelicis, R. modificata, Tetrataxis cf. parviconica, Globivalvulina ex gr. bulloides, Gl. graeca, Calcivertella heathi, Tansillites sp., Palaeonubecularia? sp., Hemigordiellina sp., Nodosinelloides longa, and N. longissima. The age of this assemblage is considered to be Gzhelian. The assemblage is dominated by the fusulinid Pseudoacutella partoazari with a low total diversity of smaller foraminifers. This assemblage is compared to similar assemblages in other parts of Iran and well as the USA. An evolutionary lineage of Pseudoacutella partoazari is also proposed. It is confirmed that Pseudonovella differs from Pseudoacutella by the periphery rounded-carinate (carinate in Pseudoacutella), pseudochomata less developed, and the type of coiling (Pseudoacutella is truly planispiral involute). Pseudonovella is suggested here as the ancestor of Pseudoacutella. This assemblage bears one unusual attribute, the overwhelming dominance of the fusulinid Pseudoacutella and the relatively low total diversity, compared with similar foraminifera from Alborz, Sanandaj-Sirjan, Sabzevar and central Iran, which present warm and humid conditions during the Late Carboniferous.

Assemblage (archaeology)

Dominance (genetics)

10.2110/carnets.2023.2306

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THE LOWER CRETACEOUS TIRGAN FORMATION IN THE GELIAN SECTION (KOPET DAGH, NORTH IRAN): MICROFACIES, MICROFOSSILS, AND THEIR BIOSTRATIGRAPHIC SIGNIFICANCE

Acta Palaeontologica Romaniae (2019)

Ioan I. Bucur Hamed Yarahmadzahi Cristian Victor Mircescu

The carbonate succession of the Tirgan Formation was studied in the Gelian section located 25 km south of Shirvan town (central Kopet Dagh). In this section, the Tirgan Formation contains a rich assemblage of calcareous algae and foraminifera. Based mainly on the orbitolinid association a latest Barremian-ealy Aptian age was assigned to the Tirgan Formation in the Gelian section. Based on the available stratigraphic analyses and age assignments of the overlying Sarcheshmeh Formation by different authors, one should presume that both the Tirgan and the Sarchesh-meh formations are heterochronous across the Kopet Dagh basin.

Aptian

Section (typography)

Stratigraphic section

Assemblage (archaeology)

Carbonate platform

10.35463/j.apr.2019.01.02

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Citations (14)

STUDY OF THE BRYOZOA OF THE LOWER PART OF THE JAMAL FORMATION IN BAZMAN REGION (SARAB SECTION)

Hamed Yarahmadzahi A Mancini Ernest

Bryozoa

Section (typography)