Figure 5 - uploaded by Seyed Hamid Vaziri
Content may be subject to copyright.
Calcareous algae: (a) Arabicodium orientalis, (b) Cylindroporella sp., (c) Permocalculus sp., (d) Boueina hochstetteri, (e) Carpathoporella fontis, (f) Kopetdagaria sphaerica. with the following foraminifers: Dictyoconus pachymarginalis, Palorbitolina lenticularis, Orbitolina conoidea, Orbitolina discoidea, Rumanoloculina sp., Rumanoloculina robusta (Figure 6). Dictyoconus pachymarginalis Range Zone is specified with appearance and extinction of Dictyoconus pachymarginalis with a thickness of 39 m (Gs 35 to Gs 45) and the age of this biozone is Early Aptian. Calcareous Algae Biozone: 4) Boueina hochstetteri-Cylindroporella Assemblage Zone: This biozone is associated with the following calcareous algae: Boueina hochstetteri, Cylindroporella sp., Boueina pygmaea, Arabicodium orientalis, Boueina sp., Cylindropo
Similar publications
Citations
... 8 http://dx.doi.org/10.18268/BSGM2022v74n2a240322 2013c; Khodashenas et al., 2014;Yavarmanesh et al., 2017;Yazdi-Moghadam et al., 2017;Neamţu, 2019). This boundary also marked by the LOD of Clypeina gigantean, Rajkaella cf. ...
... In general, the identified foraminifera assemblage in the studied area shows higher diversity than other studied areas in CEIM, Alborz, Zagros and kopet Dagh structural zones (Yazdi-Moghadam and Amiri, 2010; Roozbahani, 2011;Rami et al., 2012;Bucur et al., 2013;Schlagintweit et al., 2013aSchlagintweit et al., , 2013bWilmsen et al., 2013;Khodashenas et al., 2014;Schlagintweit and Wilmsen, 2014;Babazadeh and Dehej, 2015;Hanifzadah et al., 2015;Hosseini et al., 2016;Hassani, 2016a, 2016b;Yavarmanesh et al., 2017;Yazdi-Moghadam et al., 2017;Gheiasvand et al., 2020;Moosavizadeh et al., 2020). ...
Detailed microbiostratigraphy and basin evolution of the Lower Cretaceous deposits in the Rayen area, south of Kerman Region, SE Iran are investigated for the first time in two sections. The section no. 1 is 324.6m in thickness and comprises five lithostratigraphic units. The section no. 2 is 218 m in thickness and includes three lithostratigraphic units. The identified fauna and flora include 41 benthic foraminifera and 11 calcareous algae species. The identified assemblage indicates that the marine strata in both sections were deposited during the Barremian to Albian. The microfacies analyses carried out on 22 carbonate and 2 clastic microfacies indicate that the deposits in the section no. 1 were deposited on a homoclinal carbonate ramp, whereas in the section no. 2 they were deposited on a rimmed carbonate shelf. Generally, the Cretaceous deposit in the two studied sections represent different sedimentary models and fossil content indicating different basin evolution histories. The paleogeographic setting of the studied area on the south eastern margin of the Central-East Iranian Microcontinent and the active tectonic history during the Mesozoic suggest that the syndepositional tectonism influenced the basement’s morphology and resulted in changes in the fossil diversity and sedimentary nature of adjacent sedimentary basins.
... We did not therefore record O. nikolovi from Bulgaria (type-locality) for the palaeobiogeographic reconstructions (see Gheiasvand et al., 2021). It is notable that Simplorbitolina manasi from the Tehr section, has been already found by other researchers from the northern and southern Neotethys in Iran (e.g., Afghah and Fanati Rashidi, 2007;Yavarmanesh et al., 2017;Fig. 11). ...
Biostratigraphy of the Tirgan and Taft formations (Lower Cretaceous successions) from the Kopet-Dagh Basin (NE Iran) and Yazd Block (Central Iran) has been described using the benthic foraminifera and colomiellids, which calibrated with the stable isotope records. They have demonstrated that ages at the base and top of the formations are diachrone, and these successions start in the Berriasian? to the lower Valanginian and end in the upper Aptian to Albian. Evidence for this diachrony in ages has been provided by geometry of the Tirgan and Taft formations and showing explicit onlap patterns for the deposits. Furthermore, comments have been recently published on some benthic foraminifera and age models of the Tirgan and Taft formations by Schlagintweit (2021). Here, we explain about accuracy of the paleontology of these species and demonstrate that discussion on the age models are wrongly addressed.
... Cuneolina sp. and Trocholina sp. are the common foraminifera from the Late Barremian to Early Aptian (Yavarmanesh et al. 2017). ...
... Cuneolina sp. and Trocholina sp. are the common foraminifera from the Late Barremian to Early Aptian (Yavarmanesh et al. 2017). ...
Early cretaceous microfossils associations (foraminifera, ostracoda,
calcareous algae, and coral) from the Garagu Formation, Duhok Area,
Kurdistan Region, Northern Iraq
... Cuneolina sp. and Trocholina sp. are the common foraminifera from the Late Barremian to Early Aptian (Yavarmanesh et al. 2017). ...
Abstract
Microfossils from an outcrop of the Garagu Formation at Gara Mountain, Duhok Governorate, Kurdistan Region, Northern Iraq,
indicate a shallow marinewith normal to hypersaline conditions, shelf lagoonal environment, and open platform. Twenty samples
were collected from unbroken succession of the Garagu Formation. The thickness of the succession is 90mand it consists mainly
of different colored limestone beds with different fauna contents. The lower boundary with a gradational and conformable nature
is with Chia Gara Formation (Tithonian-Berriasian) and the upper boundary is gradational with Sarmord Formation (Valanginian-
Aptian). The microbiota associations are mostly composed of species of foraminifera, ostracods, calcareous algae, and coral, with
dissociated elements and skeletal fragments of gastropods, pelecypods, bryozoans, sponge spicules, crinoid debris, and
echinodermata spines. Sixty species are recorded in this study; the combined stratigraphic ranges of the microfossil species
identified from the studied section of the Garagu Formation support an age determination of the Late Valanginian-Barremian.
Keywords Microfossils . Garagu formation . Early Cretaceous . Systematic description . Duhok . Kurdistan . Iraq
... Cuneolina sp. and Trocholina sp. are the common foraminifera from the Late Barremian to Early Aptian (Yavarmanesh et al. 2017). ...
This paper is a detailed research concerning the biostratigraphy and age determination of Garagu Formation from Kurdistan Region, Northern Iraq.
Lower Cretaceous carbonate successions outcrop extensively along the northern Tethyan margin in the Kopet-Dagh (NE Iran) and Yazd Block (Central Iran). These carbonate units are not well constraint in terms of stratigraphic, sedimentological, geochemical, and paleobiogeographic view point. To improve our knowledge, a detailed multidisciplinary study has been presented on two roughly coeval stratigraphic units in the two different areas, and correlated with other tethyan carbonates. The two stratigraphic units (Taft and Tirgan formations) have been deposited along a carbonate shelf with microfacies associations ranging from the outer-shelf to the inner-shelf settings. Diachrony in ages at the base and top of the stratigraphic units suggests the long-term subsidence effects during the Early Cretaceous, followed by a Cimmerian phase of epi-orogenesis, and also the remnant paleoreliefs. New biostratigraphic data coupled with stable isotope δ¹³C records shows that the onset of carbonate production started much earlier than previously thought (Valanginian rather than Barremian). Our results also permit us to correlate the lower Aptian stratigraphic units with the OAE1a. The worldwide distribution of index microfossils including benthic foraminifera and colomiellids reported on paleobiogeographic reconstructions. They have been used to define paleobiogeographic provinces for the Valanginian, Hauterivian and Aptian intervals and show predominant basin connections. Significantly, the allochem content of the lithostratigraphic units and their phosphorus accumulation show phases of important heterozoan to photozoan carbonate production, which are recorded in other localities of the Tethyan realm as the consequence of global paleoceanographic changes.
