key: cord-0946262-w1yska54 authors: Consorti, Lorenzo; Rashidi, Koorosh title: An enigmatic Maastrichtian small benthic Foraminifera of the Tarbur Formation (Iran, Zagros zone) date: 2020-07-08 journal: Cretac Res DOI: 10.1016/j.cretres.2020.104557 sha: 0919dde98ea6a155c418796abd859d04670a3203 doc_id: 946262 cord_uid: w1yska54 The Maastrichtian carbonates of the Tarbur Formation from the Zagros zone (SW Iran) are very rich in larger Foraminifera. Additionally, smaller benthic Foraminifera occur as well, one of them presented here as Covidaria pinnata n. gen., n. sp. It occurs abundantly at the Mandegan section within two levels corresponding to the lower photic zone. Based on the existence of a central pile along with an umbilical plate, and the lacks of true interiomarginal apertures, likely represented by a perforate surface, the suprageneric placing of Covidaria n. gen. remains controversial. The ultimate aperture is represented by a central elongate double-bifid slot that arguably lies on a finely perforated and heavy feathered apertural face. Based on the reduced dimensions and lack of dimorphism the new taxon could be considered an epifaunal or shallow-infaunal r-strategist. emplacement is interpreted to be driven by a regional Maastrichtian transgression 23 event (Saura et al., 2011) . Based on the common occurrence of larger Foraminifera, 24 rudists, corals and Dasycladacean green algae (Pirbaluti et al., 2013; Afghah, 2016 ; 25 Rashidi and Schlagintweit, 2017), these carbonates were presumably deposited under 26 oligotrophic or mesotrophic conditions, in the illuminated waters of the photic zone 27 . Diversity of Foraminifera reach a very high value and includes 28 both small and large species Consorti and Rashidi, 29 2018; 2019). Such as diversity was likely driven by the existence of several 30 environments, generated by food availability, bottom type and light penetration along 31 the shelf gradient (Hottinger, 1997; Hohenegger, 2000) . Going throughout the water 32 depth that received a few light penetration, number of small foraminifers is somewhat 33 very notable. The shape and dimension along with the facies of the embedding 34 limestone may lead, at a hasty eye, to point a keeled planktonic form such as 35 Globotruncana Cushman. A closer look in thin section reveals, instead, an umbilical 36 shell infilling (e.g. umbilical plug), among the other features, that can be frankly 37 associated to a benthic undescribed rotaliid Foraminifera. 38 Aim of the present contribution is to formally define this small Maastrichtian taxon 39 through a detailed architectural analysis of its shell architecture in thin sections. Some Biostratigraphy, facies analysis of Upper Cretaceous-Lower 210 Paleocene strata in south Zagros basin (southwestern Iran) Paleotectonic 213 Reconstruction of the Central Tethyan Realm Palinspastic maps from Late Permian to Pliocene A new evidence of passing the Maastichtian-Paleocene 217 boundary by larger benthic foraminifers: The case of Elazigina from the 218 Maastrichtian Tarbur Formation of Iran Maastrichtian of Zagros) and comments on the associated 222 rotaloidean and other lamellar perforate Foraminifera Maastrichtian-Paleocene larger Foraminifera 225 biostratigraphy and facies of the Şahinkaya Member Rotaloidean foraminifera from the Upper 229 Cretaceous carbonates of Central and Southern Italy and their 230 chronostratigraphic age A new Idalina (Milioloidea Foraminifera) and some associated fauna from the upper Maastrichtian Tarbur 233 Formation of SW Iran Morphology and microhabitat preferences of benthic foraminifera 235 from the northwest Atlantic Ocean Coenoclines of Larger Foraminifera Processes determining the distribution of larger foraminifera in 239 space and time Shallow benthic foraminiferal assemblages as signals for depth of 241 their deposition and their limitations Functional Morphology of Benthic Foraminiferal Shells, Envelopes 244 of Cells beyond Measure Learning from the past Discovery and spoliation of the Biosphere Illustrated glossary of terms used in foraminiferal research The depth-depending ornamentation of some lamellar-perforate 253 foraminifera Paleogene Larger Rotaliid Foraminifera from the Western and 255 Praestorrsella rostae (Visser), a foraminiferal index fossil 257 for Late Cretaceous deeper neritic deposits Stratigraphic Nomenclature of Iranian Oil Consortium 259 Benthic foraminiferal microhabitats below the sediment-water 261 interface Biostratigraphy and regional aspects of the Tarbur 264 Formation (Maastrichtian) in Central Zagros, Southwest Iran The influence of Late Cretaceous tectonic processes on 268 sedimentation patterns along the northeastern Arabian plate margin Paleoenvironmental 274 distribution of larger foraminifera in upper Cretaceous siliciclastic carbonate 275 deposits Basin architecture and growth folding of the NW Zagros early foreland basin 280 during the Late Cretaceous and early Tertiary Some new and poorly known benthic foraminifera 283 from late Maastrichtian shallow-water carbonates of the Zagros Zone Orbitolinid Foraminifera from the 286 Late Maastrichtian of the Tarbur Formation (Zagros Zone, SW Iran) Biostratigraphy and evolution of larger rotaliid foraminifera in the Cretaceous-290 Palaeogene transition of the southern Oman Mountains Comments and suggestions made by the Journal reviewers André Piuz (Geneva) and 207 Felix Schlagintweit (Munich) are gratefully acknowledged. 208 The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.The corresponding author in behalf of the second author Lorenzo Consorti