Türkiye Jeoloji Bülteni
Türkiye Jeoloji Bülteni

Türkiye Jeoloji Bülteni

2009 NİSAN Cilt 52 Sayı 1
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Early Eocene (middle-late Cuisian) Molluscs Assemblage from the Harpactocarcinid Beds, in the Yoncalı Formation of the Çankırı Basin, Central Anatolia, and Implications for Tethys Paleogeography
Yavuz Okan İzzet Hoşgör
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Abstract: A diverse and abundant Early Eocene (middle-late Cuisian) molluscs assemblage from the YoncalıFormation of the Çankırı Basin in central Anatolia is documented for the first time in this study. Sixspecies of bivalves, four species of gastropods, and one species of scaphopod are described from theformation. The central part of the Yoncalı Formation consists mostly of sandstones, pelagic mudstoneand limestones with harpactocarcinids and the molluscs found were derived from this part. Associatedfauna found here included benthic foraminiferans, serpulids, undetermined echinoids and shark teeth,and dating was mainly based on the benthic foraminiferans. The distribution of bivalve, gastropod andscaphopod species suggest that this area has affinities with the East European Province of Turkey. Thecosmopolitian distribution of the recorded species is useful for paleobiogeographic reconstruction. Thisreveals that there was a direct connection throughout the Tethyan realm and a connection between theTethyan central Anatolia and Indo-Pasific realms, at least until the end of the Paleocene to Early Eocene(Early Tertiary), and this allowed the migration of benthic organisms.  

  • Çankırı Basin

  • Early Eocene

  • Molluscs

  • Paleogeography

  • Turkey


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    İbrahim Engin Meriç Niyazi Avşar Figen Mekik Baki Yokeş İpek F. Barut Osman Özcan Dora Fikret Suner Fulya Yücesoy Eryilmaz Mustafa Eryilmaz Feyza Dinçer Erol Kam
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    Abstract: Four core samples were collected from the vicinity of Alibey and Maden islands on the northwestern ofAyvalık. 91 sediment samples were obtained from the cores and were analyzed for their recentforaminifer content. High abundance of individuals with morphological abnormalities were observed inbenthic foraminifer species such as, Peneroplis pertusus, P. planatus, Lobatula lobatula, Ammoniacompacta, A. parkinsoniana, Challengerella bradyi, Elphidium complanatum, E. crispum. Theintroduction and deposition of heavy metal with terrestrial origin in marine biota result in anenvironmental risk for aquatic life. Environmental pollution became common mainly in the second halfof 20th century, because of dumping of materials, such as manganese, lead and iron to terrestrial andmarine environments. Also managing the ore beds led to significant morphological changes inforaminiferal assemblages. The abnormal test development observed in foraminifers and presented inthis study are suggested to be the result of biological effects of the heavy metals that reached marineenvironment, and this phenomenon can be used as a practical indicator to determine the naturalenvironmental pollution. The aim of this study is to find out the possible reasons of these morphologicalabnormalities, and compare with other factors which are known to cause similar deformations. 

  • abnormal individuals

  • Alibey and Maden islands (Ayvalık)

  • benthic foraminifera

  • radioactivity

  • sediment geochemistry


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  • Ostracoda Assemblage and Environmental Interpretation of the Bartonian-Priabonian Seydiler Formation (Kastamonu-Northern Turkey)
    Nazan Yeşilyurt Cemal Tunoğlu İbrahim Kadri Ertekin
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    Abstract: The study area comprises about 40 km2 and is located in the north of Seydiler town near Kastamonucity. The unit, that is widely exposed in the region, is named for the first time “Seydiler Formation”.This formation conformably overlies the Lutetian Gürleyikdere Formation at the base while it is overlainby Recent and Quaternary alluvium deposits with an unconformity at the top. Seydiler Formation isrepresented by thin bedded sandstone-marl alternations at the base and by medium to thick-bedded, darkgrey marls in the upper parts. The thickness of the formation varies from 30 to 215 meters.Paleontological examinations were carried out on 184 samples collected from 7 stratigraphic sections.Overall, 19 taxa belonging to 11 ostracod genera in 9 different families were determined. Among thefamilies Cytherellidae, Bairdiidae and Krithidae, were the dominant genera. One species“Echinocythereis anatolica n.sp.” is proposed as a new species. Cytherella and Krithe are very abundantand dominant within the ostracoda assemblage. Based on the ostracod assemblage examined, the age ofthis unit is assigned as Bartonian-Priabonian. This assignment is also supported by the dating ofplanktonic foraminifers, nannoplanktons and dinoflagellates. All paleontological data of the study areaindicate neritic to bathyal marine depositional conditions with normal salinities.  

  • Ostracoda

  • Bartonian-Priabonian

  • Seydiler Formation

  • Kastamonu

  • Turkey


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  • A Late Pliocene-Quaternary Pinched Crustal Wedge in NW Central Anatolia, Turkey: A Neotectonic Structure Accommodating the Internal Deformation of the Anatolian Plate
    Gürol Seyitoğlu Bahadir Aktuğ Levent Karadenizli Bülent Kaypak Şevket Şen Nizamettin Kazanci Veysel Işik Korhan Esat Oktay Parlak Baki Erdoğan Varol Gerçek Saraç İlker İleri
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    Abstract: The Neo-Tethyan suture zone in the western margin of the Çankırı basin (NW central Anatolia, Turkey)has been reactivated as a pinched crustal wedge due to a NW – SE compression created by the rightlateral North Anatolian Fault Zone and the Kırıkkale – Erbaa Fault Zone. This neotectonic structure, theEldivan-Elmadağ pinched crustal wedge-(EPCW), having a thrusted eastern and normal faulted westernmargin, has accommodated a 2.8 km shortening since the Late Pliocene. This result accords with themodel in which the Anatolian plate is squeezed from the east rather than pulled from the southwest. TheEPCW, a recently active structure, should be regarded as a potential source in the earthquake riskassessment of central Anatolia, particularly for the capital city Ankara and for Çankırı.

  • Neotectonics

  • Central Anatolia

  • GPS

  • Seismicity

  • Turkey


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