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Öğe Crustose red algae in deep time environments: Palaeoecological insights from northeastern India and Türkiye (Turkey)(Elsevier B.V., 2024) Sarkar, Suman; Sinanoglu, Derya; Özgen-Erdem, NazireCrustose red calcareous algae are key organisms in benthic ecosystems worldwide with critical functions like reef-building and substrate stabilization. Coralline algae thrived as major carbonate producers, with corals and/or larger benthic foraminifera (LBF) in numerous shallow-marine Tethyan carbonate platforms from the early Palaeogene to the Neogene. The Palaeocene–Eocene limestone successions in the Jaintia and Khasi Hills, Meghalaya, northeastern India, encompass two principal community types — algal-foraminiferal and coralline algal, with no associated colonial corals, while the Oligocene–Miocene carbonates from the Sivas basin and Siirt province in Türkiye are characterized by an algal-foraminifera assemblage with bryozoans, corals, and molluscs as other noteworthy components pertinent to the carbonate platform environment. We found that the diversity and ecology of these algal communities were influenced by systematic structure of the algal assemblage, sediment input, substrate stability, water depth, and hydrodynamic energy. The algal assemblages from different epochs and varying localities diverge based on the sedimentary regime, environmental settings, and the predominant taxa. The climatic transition from the Palaeocene–Eocene greenhouse to the Oligocene–Miocene icehouse corresponded to a shift from crustose algal assemblages dominated by Sporolithales to assemblages dominated by Hapalidiales. © 2024 Elsevier B.V. and Nanjing Institute of Geology and Palaeontology, CASÖğe Dictyoconus aydimi (Gallardo-Garcia and Serra-Kiel, 2016) comb. nov., larger benthic foraminifera from the Middle-Upper Eocene of the Middle East (SE Turkey, Iraq, SW Iran, Oman): New evidence for Arabian Plate faunal provincialism(Tubitak Scientific & Technological Research Council Turkey, 2021) Ozgen-Erdem, Nazire; Schlagintweit, Felix; Sinanoglu, DeryaRogerella aydimi Gallardo-Garcia and Serra-Kiel was described from the Priabonian Haluf Member of the Aydim Formation, Oman. Based on new finds from the Bartonian Hoya Formation of SE Turkey and the Jahrum Formation of Iran, its taxonomic status is discussed herein. It is concluded that it represents a species of Dictyoconus with a simple subepidermal network (1 rafter, 1 intercalary beam) below a thin epiderm. The stratigraphic range of D. aydimi known thus far is Bartonian-Priabonian or Shallow Benthic Zone 1720. The distribution of D. aydimi gives further evidence for a Middle-Late Eocene faunal provincialism of the Arabian Plate (Somalia, Oman, Iran, Iraq, SE Turkey).Öğe Distribution of Alveolina assemblages in the Ypresian (Herdian-Cuisian) successions from Iran and Turkey central and western Tethys): biostratigraphic implications for regional correlation(Micro Press, 2020) Hadi, Mehdi; Ozgen-Erdem, Nazire; Sinanoglu, Derya; Sarkar, Suman; Zareh, AzamBenthic foraminiferal assemblages dominated by Alveolina species from the Ypresian (Herdian-Cuisian) are studied herein from numerous localities of Iran and Turkey. From these successions, highly diversified assemblage of 58 alveolinid species are identified along with their detailed biostratigraphical application, which resulted in the recognition of eight shallow benthic zones (SBZ5-SBZ 12). Our findings are based upon the distribution ranges ofAlveolina from the Ilerdian-Cuisian sediments in Iran (Central Tethys) that are considered to have a strong affinity with their coeval fauna in Turkey (Western Tethys). In this study, the wide expansion ranges of Alveolina permit us to achieve a high-resolution biostratigraphy and apply the shallow benthic zones of the peri-Mediterranean region (Western Tethys) to the Ilerdian-Cuisian successions in Iran (Central Tethys). Nevertheless, the distribution of some Alveolina species, even the zonal markers consisting of Glomalveolina lepidula, Alveolina ellipsoidalis, A. pisifonnis, A. laxa, A. subpyrenaica, A. varians, A. fornasinii and A . canavarii are found occurring at younger stratigraphic levels in Iran and/or Turkey than in the western European shallow marine deposits.Öğe Foraminifera from the Maastrichtian Garzan and Lower Germav formations of the Arabian Platform (Batman, SE Turkey)(Micro Press, 2020) Sinanoglu, Derya; Ozgen-Erdem, Nazire; Sari, BilalThe Upper Cretaceous successions of the Arabian Platform in Batman and surroundings (SE Turkey) comprise the Garzan and Lower Germav formations. Shallow water limestones of the Garzan Formation contain rich benthic foraminiferal assemblages. The conformably overlying Lower Germav Formation consists mostly of marls and includes planktonic foraminifera, which suggest a relatively deeper marine environment. Benthic and planktonic foraminiferal assemblages from both formations were studied in 28 samples collected from a 155-m-thick measured section. Diverse benthic foraminiferal assemblages are mainly dominated by Orbitoides megaloformis Papp and Kupper, O. media (d'Archiac), Omphalocyclus anatoliensis Ozcan, Dicyclina schlumbergeri Munier-Chalmas, Trochospira avnimelechi Hamaoui, Nezzazata simplex Omara, Nezzazatinella picardi (Henson), Antalyna korayi Farinacci and Koyluoglu, Fleuryana adriatica (DeCastro), Biconcava bentori Hamaoui, Cuneolina pavonia d'Orbigny, C. ketini Inan, Moncharmontia apenninica (DeCastro), M. compressa (De Castro), Fissoelphidium operculiferum Smout and Vandenbroekia munieri Marie. The majority of Late Cretaceous taxa are long-ranging. Orbitoides media and O. megaloformis within this assemblage have been documented both in the upper Campanian and Maastrichtian strata from the Tethyan Province. The age of the Garzan Formation is determined to be Maastrichtian based on the presence of Antalyna korayi, C. ketini and Fleuryana adriaticia. The abundance of opportunist planktonic foraminifera (i.e., biserial heterohelicids and rugoglobigerinids) throughout the Lower Germav Formation shows that the environment was not very deep during the deposition of the unit. Maastrichtian taxa such as Globotruncanita conica (White) and Globotruncanella minuta Caron and Gonzales Donoso appear in the middle part of the Lower Germav Formation, but these are absent from the lower part of the formation.Öğe FORAMINIFERAL DESCRIPTION OF THE MIOCENE SHALLOW-WATER LIMESTONE FROM THE DIYARBAKIR AND SIIRT AREAS OF SOUTHEAST TURKEY(Palaeontological Soc India, 2020) Sirel, Ercument; Ozgen-Erdem, Nazire; Sinanoglu, DeryaThis study presents the descriptive palaeontology of two very shallow-water Miocene successions with benthic foraminifera located in the DiyarbakirSiirt region of southeastern Turkey. Two rows of apertural foramina and alternating Y-shaped septula with supplementary chamberlets were identified. As a result, Borelis curdica (Reichel) was transferred to Praebullalveolina Sirel and Acar as Praebullalveolina curdica (Reichel). Furthermore, two Holocene archaiasinid genera, Androsina Levy and Cyclorbiculina Silvestri, of the new species were described and figured as Cyclorbiculina minima n. sp. and Androsina diyarbakirensis n. sp. from the very shallow-water Miocene limestone of the Derge section. The Oligocene hauerinid species Sivasina egribucakenssis Sirel and Ozgen-Erdem and Sivasina batmanensis n. sp. were also defined from the shallow-water Miocene limestone of the Derge and Baysu sections.Öğe Hasankeyf (Batman) Site From Cultural Geological Perspective(TMMOB JEOLOJI MUHENDISLERI ODASI, 2017) Sinanoglu, Derya; Siyako, Muzaffer; Karadogan, Sabri; Ozgen Erdem, NazireHasankeyf, a district of Batman, is positioned near Tigris river, assigned as protected area and consists hundreds of residents which are located in carved rocks. Although, Hasankeyf has lost its importance today, it was containing many civilizations, culture and knowledge in the region before. Hasankeyf is unique since, geologic and geomorphologic structure has been used wisely in accordance with today's conditions. Firstly, defense of the premises had a crucial role while Hasankeyf had been shaped. Carved rocks in there, sheltered thousands of people within a complex organization. Not only the geomorphologic structure, but also the characteristics of rocks have an effect on the generation of carved rock settlements. Hasankeyf should be considered as a cultural geologic heritage owing to, the magnificent appearance of carved rock settlements, the richness of geologic-geomorphologic elements and their effects on the settlement's continuity.Öğe Lutetian-Bartonian (Middle Eocene) micropalaeontology, biostratigraphy and palaeoecology of the Mengen Coal Basin, Northwest Turkiye (Turkey)(Elsevier, 2025) Durak, Sariye Duygu; Akkiraz, Mehmet Serkan; Ozgen-Erdem, Nazire; Nazik, Atike; Yagmurlu, Fuzuli; Sinanoglu, DeryaThis study focuses on the upper Lutetian-lower Bartonian Tokmaklar Formation in the Mengen Basin of Northwest Turkiye (Turkey), examining various aspects such as biostratigraphy, palaeoecology, and isotope data (S18O and S13C), providing insights into the geological history and environmental conditions during this interval. Moreover, the study incorporates coal petrography on four samples to explore a potential correlation between the coalification process and the preservation of palynomorphs. The formation is informally divided into two distinct categories: a coal-bearing sequence positioned at the base of the formation and a coal-free sequence above it. However due to dense vegetation and soil cover in the area, the availability of suitable outcrops for measured sections and obtaining samples is severely limited. Therefore, we relied on drilling data from Turkish Coal Enterprises (TCE) for the purpose of coal exploration, as well as two partial sections (Ender and C,orak) from underground mining. Microapalaeontological evidences involving benthic foraminiferans, ostracods, and palynomorphs, along with isotope data (S18O and S13C), suggest that the Tokmaklar Formation was deposited as a result of a local transgressive process during the late Lutetian-early Bartonian. Furthermore, palynological data, particularly the existence of mangroves such as Nypa, lepidocaryoid palm and Acrostichum aureum, coupled with quantitative palaeoclimate analysis, the negative S18O values, and the lower S13C values indicate a warm, probably tropical climate under high rainfall. (c) 2024 Elsevier B.V. and Nanjing Institute of Geology and Palaeontology, CAS. All rights are reserved, including those for text and data mining, AI training, and similar technologies.Öğe Mid-Eocene (Bartonian) larger benthic foraminifera from southeastern Turkey and northeastern Egypt: New evidence for the palaeobiogeography of the Tethyan carbonate platforms(PERGAMON-ELSEVIER SCIENCE LTD, 2018) Sallam, Emad S.; Erdem, Nazire Ozgen; Sinanoglu, Derya; Ruban, Dmitry A.Larger benthic foraminiferal assemblages from the mid-Eocene (Bartonian) sedimentary successions of the Tethyan carbonate platforms have been studied in southeastern Turkey and northeastern Egypt. In the Hazro-Diyarbakir section (SE Turkey), small-medium miliolids and textularinids are identified from the lower intervals of the Hoya Formation, whereas alveolinids and soritids (porcellaneous) and orbitolinids (agglutinated) increase in diversity and abundance in the upper intervals. The Dictyoconus aegyptiensis (Chapman) and Somalina stefaninii Silvestri are recorded for the first time from the Hoya Formation. The larger benthic foraminiferal assemblage from the Hoya Formation shows a significant similarity to those reported from the Observatory Formation (coeval with the Sannor Formation) in the Cairo-Suez district (NE Egypt). The studied foraminiferal assemblages imply restricted lagoonal-tidal flat palaeoenvironments. Palaeobiogeographically, the larger benthic foraminiferal assemblages recorded in southeastern Turkey and northeastern Egypt carbonate platforms display a strong affinity to the Arabian, Middle East and African platforms. The position of the global sea-level and the plate tectonic organization of the studied region during the Bartonian were the main factors that facilitated faunal exchange within the carbonate platforms. (C) 2018 Elsevier Ltd. All rights reserved.Öğe Shallow Marine Benthic Foraminifera Assemblage of the Early Eocene Succession in the Northern Arac (Kastamonu) and Paleoecological Interpretation(TMMOB JEOLOJI MUHENDISLERI ODASI, 2016) Ozgen Erdem, Nazire; Canbolat, M. Yasin; Sinanoglu, DeryaSoganli Formation of Early Eocene age in the northeastern of Arac (Kastamonu) has been investigated in order to determine their paleontology and palaeoecology. The sequence consists of gray, yellowish, clayey limestone, rich in larger benthic foraminifers. The lower parts of clayey limestone are dominated by porcellaneous foraminifera such as Alveolina and Orbitolites and by dascylad algae. The top of the section is characterized by hyaline calcareous foraminifers such as Assilina and Nummulites. Idalina sinjarica Grimsdale, Glomalveolina lepidula Schwager, A. cemali Sirel & Acar, A. rotundata kazancii Sirel & Acar, A. erki Acar, A. ankarensis Sirel, A. pieroi Sirel & Acar, Lockhartia conditi (Nuttall), L. tipperi (Davies), Orbitolites complanatus Lamarck, Cyclopertorbitolites tokerae Ozgen-Erdem, Assilina spinosa Davies & Pinfold, Nummulites sp., Cribrobulimina sp., Kathina sp., Neorotalia sp., Triloculina sp. have been decribed along the section. The distribution of the larger benthic foraminifera indicates Early Eocene age. According to these assemblages, we interpret that deposition of the unit started in a restricted shallower environment and continued in a shallow high energy environment.
