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    Biostratigraphic interpretation and systematics of Alveolina assemblages from the Ilerdian-Cuisian limestones of Southern Eskisehir, Central Turkey
    (PERGAMON-ELSEVIER SCIENCE LTD, 2007) Ozgen-Erdem, Nazire; Akyazi, Mehmet; Karabasoglu, Asli
    The Ilerdian-Middle Cuisian sedimentary succession of the Seyitgazi region, southern Eskisehir (Central Anatolia, Turkey) is composed of claystones, limestones and clayey limestones. It contains abundant benthic foraminifera, particularly species of Alveolina. From this succession, 28 species of Alveolina d'Orbigny are described and their comparative stratigraphic distribution with the Alveolina species in the Tethyan Eocene is documented. Generally, Ilerdian-Cuisian Alveolina assemblages of the Seyitgazi region have close affinities with coeval Alveolina assemblages described in different studies from the Tethyan Province. The Ilerdian unit of the study area is characterized by Alveolina species such as Glomalveolina lepidula, Glomalveolina minutula, G. karsica, Alveolina vredenburgi, A. ellipsoidalis, A. avellana, A. aff. minervensis, A. dedolia, A. moussoulensis, A. subpyrenaica, A. laxa, A. aragonensis, A. varians, A. ilerdensis, A. trempina, A. citrea, A. pisella and A. decipiens. Likewise, the Early Middle Cuisian unit is represented by G. minutula, A. oblonga, A. schwageri, A. haymanensis, A. canavarii, A. aff. coudurensis, A. ruetimeyeri, A. muscatensis, A. cremae, A. bayburtensis and A. lehneri. (c) 2006 Elsevier Ltd. All rights reserved.
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    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, Derya
    Rogerella 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).
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    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, Azam
    Benthic 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.
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    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, Bilal
    The 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.
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    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, Derya
    This 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.
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    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, Derya
    This 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.
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    Microfacies and Depositional Environment of the Ilerdian Carbonates in the North-Western Tosya (SE Kastamonu) Region, Northern Turkey
    (SPRINGER INDIA, 2019) Ozgen-Erdem, Nazire; Koc-Tasgin, Calibe
    Ilerdian (early Eocene) carbonates in the northwestern Tosya region, northern Turkey, are characterized by porcellaneous larger benthic foraminifera; Glomalveolina, Alveolina, Orbitolites, Opertorbitolites and Cyclopertorbitolites are common in the southeastern Kastamonu region, in facies deposited on a low-gradient carbonate ramp. The inner ramp comprises of Miliolid-soritid wackestone, Soritid wackestone, Alveolinid-soritid wackestone-packstone, Alveolinid wackestone, Alveolinid-Nummulitid wackestone-packstone, algal wackestone, and Coralline algal pack-grainstone microfacies. The middle ramp deposits are composed of Alveolinid-nummulitid wackestone-packstone and Nummulitid wackestone-packstone microfacies. Overall, the succession reflects a long term deepening trend.
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    Oligocene and early Miocene charophyte flora from the Sivas Basin (Central Anatolia, Turkiye). Biostratigraphy and palaeobiogeography
    (Elsevier, 2025) Sanjuan, Josep; Demirci, Elvan; Kangal, Ozgen; Ozgen-Erdem, Nazire
    A rich charophyte assemblage is described and illustrated here from the Upper Paleogene-Lower Neogene lacustrine and palustrine rocks of the Sivas Basin (central Anatolia, Turkiye). The flora was extracted from 3 stratigraphic sections located in the eastern part of the Sivas Basin in the localities of Emirhan, Egribucak, and Taslidere. Nine species belonging to two families (Characeae and Raskyllaceae) are identified here. The Characeae species from Emirhan and Taslidere (Emirhan and Karayun formations) are diverse and the assemblage is represented by Sphaerochara ulmensis, Sphaerochara sp., Chara molassica var. notata, Ch. cf. pappii, Chara sp., Hornichara sp., Lychnothamnus pinguis forma major and Nitellopsis (Tectochara) merianii. Several of these species display a wide biostratigraphic range in Europe spanning from the early Oligocene to middle Miocene. The cooccurrence of L. pinguis and Ch. molassica var. notata suggests that both the Emirhan and Karayun formations are upper Rupelian-lower Chattian (similar to 30-25 Ma). In terms of paleogeography, this flora displays a clear European affinity. The charophyte flora recovered from the Egribucak locality (Unit 3 of the Egribucak Formation) is composed of the single species Rantzieniella nitida which displays a limited biostratigraphic range within the Aquitanian (early Miocene). Accordingly, Unit 3 of the Egribucak Formation can be correlated with the homonymous European charophyte biozone as well as with the Mammal Neogene Zones MN1-2 (similar to 24-21 Ma). Moreover, the occurrence of this index species in central Anatolia confirms its Eurasian distribution highlighting the usefulness of R. nitida in intercontinental basin correlation.
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    Planktonic and benthic foraminiferal biostratigraphy of the Middle Eocene-Lower Miocene successions from the Sivas Basin (Central Anatolia, Turkey)
    (SLOVAK ACAD SCIENCES GEOLOGICAL INST, 2016) Hakyemez, Aynur; Ozgen-Erdem, Nazire; Kangal, Ozgen
    Planktonic and benthic foraminifera are described from the Middle Eocene-Lower Miocene successions in the Sivas Basin, Central Anatolia. An integrated foraminiferal zonation provides new age assignments in terms of a great number of taxa for the studied sections. Four biostratigraphical intervals are first recorded based on the concurrent ranges of sporadically occurring but well preserved planktonic foraminiferal assemblages. The first interval characterized by the co-occurrences of Acarinina bullbrooki, Truncorotaloides topilensis and Turborotalia cerroazulensis is referable to the E11 Zone of late Lutetian-early Bartonian. An assemblage yielding Paragloborotalia opima accompanied by Globigerinella obesa forms a basis for the late Chattian O5 Zone. The successive interval corresponds to the late Chattian O6 Zone indicated by the presence of Globigerina ciperoensis and Globigerinoides primordius along with the absence of Paragloborotalia opima. The early Aquitanian M1 Zone can be tentatively defined based mainly on the assemblage of Globigerina, Globigerinella, Globoturborotalita and Tenuitella. The biostratigraphical data obtained from the benthic foraminifera assign the studied sections to the SBZ 21-22, SBZ 23 and SBZ 24 ranging in age from Rupelian to Aquitanian. The SBZ 23 and 24 are well constrained biozones by the occurrences of Miogypsinella complanata and Miogypsina gunteri, respectively, whereas the SBZ 21-22 defined by nummulitids and lepidocylinids in the Tethyan Shallow Benthic Zonation is characterized dominantly by peneroplids, soritids and miliolids in the studied sections. Benthic foraminiferal assemblages suggest different paleoenvironments covering lagoon, algal reef and shallow open marine whereas planktonic foraminifera provides evidence for relatively deep marine settings on the basis of assemblages characterized by a mixture of small-sized simple and more complex morphogroups indicative for intermediate depths of the water column.
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    Systematics and biostratigraphy of Oligocene (Rupelian-Early Chattian) foraminifera from lagoonal-very shallow water limestone in the eastern Sivas Basin (central Turkey)
    (INST GEOLOSKA ISTRAZIVANJA, 2013) Sirel, Ercument; Ozgen-Erdem, Nazire; Kangal, Ozgen
    The aim of the present work is to describe the Oligocene (Rupelian-early Chattian) shallow water larger foraminifera from central Turkey (Sivas Basin). Among them is a new miliolid genus, Sivasina n. gen. SIREL & OZGEN-ERDEM (type species Sivasina egribucakensis n. gen. n. sp. SIREL & OZGEN-ERDEM), which occurs in the Egribucak, Bakimli, Tuzlagozu and Caygoren sections (E of Sivas). One new Rupelian-early Chattian lagoonal very shallow water peneroplid species Peneroplis flabelliformis n. sp. SIREL & OZGEN-ERDEM from the Egribucak, Tuzlagozu and Caygoren sections and Rupelian lagoonal two new peneroplid species Coscinospira sivasensis n. sp. SIREL & OZGEN-ERDEM, Coscinospira elongata n. sp. SIREL & OZGEN-ERDEM from the Egribucak section (E of Sivas), two new Rupelian very shallow water alveolinid species Praebullalveolina oligocenica n. sp. SIREL & OZGEN-ERDEM and Praebullalveolina minuta n. sp. SIREL & OZGEN-ERDEM from the Bakimli section are described and figured. Furthermore, details on several already known Oligocene species are given (soritids: Praearchaias diyarbakirensis SIREL, Praearchaias minimus SIREL, Archaias kirkukensis HENSON, Archaias asmaricus SMOUT & EAMES; austrotrillinids: Austrotrillina brunni MARIE). In addition, the biostratigraphy of four studied sections is discussed.