173 research outputs found
Ostracode fauna of quaternary sequence at Küçüksu Palace (Anadolu Hisarı - İstanbul
No full textBu araştırmada amaç; Küçülcsu Kasrı (Anadolu Hisarı-İstanbul) temel sondajlarından alınan 98 örneğin ostrakod içeriğini incelemek ve tanımlanan ostrakod cins ve türlerine göre Kuvaterner döneminde inceleme alanındaki paleoekolojik koşulları açıklamaktır. Boğazın Anadolu tarafında bulunan inceleme alanından alınan örneklerde tanımlanan 24 ostrakod cinsi ve 40 türü bölgede brahik- brahik/denizele geçiş-denizel olarak 3 farklı ortamın varlığını belirlemektedir.The aim of this study is to examine Ostracoda fauna of 98 samples collected from foundation drillings ofKüÇüksu Palace (Anadolu Hisarı-İstanbul) and to explain the paleoecological conditions based on these ostracode species and genera in the study area during the Quaternary. 24 genera and 40 species of ostracodes, obtained from the study area located on the Anatolian side of the Bosphorus, explain that 3 various environment conditions in the region; brackish, brackish- marine, marine
First Records of Late Devonian Entomozoacean Ostracods in North-western Turkey
No full textEntomozoacean ostracods (pelagic so-called fi ngerprint-ostracods) have recently been observed for the fi rst
time in Upper Devonian sediments of the Darlık B Section from the İstanbul region, north-western Turkey. Th ese
new assemblages consist of Entomoprimitia nitida, Entomoprimitia sartenaeri, Entomoprimitia concentrica, Franklinella
calcarata, Waldeckella erecta?, Rabienella n. sp. c, aff . reichi sensu Rabien & Rabitz 1958, Rabienella reichi, Richterina
(Volkina) zimmermanni and Nehdentomis pseudorichterina and can be dated as Late Frasnian Entomoprimitia sartenaeri
Zone (= variostriata Zone sensu Rabien 1954).
Th ese entomozoacean ostracods indicate a faunal relationship with Germany (Rhenish Schiefergebirge, Harz Mountains,
Th uringia), Poland (Holy Cross Mountains), N France-Belgium (Ardennes), Volgo-Ural Region and South China in the
Late Devonian
New observations on the age and environmental features of the Bakırköy formation based on ostracoda fauna (Küçükçekmece-İstanbul)
No full textBu araştırmada amaç; Avcılar, Cennet mahallesi ile Bahçelievler'de açılan yarmalarda yüzlek veren Bakırköy formasyonu'nun ostrakodlarını incelemek, yaş değerlendirmesi ve ortamsal yorum yapmaktır. Küçükçekmece'de, Avcılar'daki yüzlekten ölçülen kesitte İstanbul yeşil kili denilen Güngören formasyonu üzerinde uyumlu olarak Bakırköy formasyonunun killi kireçtaşı, kiltaşı ve fosilli kireçtaşı seviyeleri gözlenmiştir. En üstte de bitkisel toprak dolgu bulunmaktadır. Doğuya doğru Cennet mahallesi'nde Bakırköy formasyonu yine killerin üstünde kireçtaşı ve killi kireçtaşı ile temsil edilir. Bahçelievlerde ölçülen kesitte istif; kavkılı kireçtaşı, killi kireçtaşı ile kiltaşlarının ardalanmasından oluşmakta ve üstte de kumlu kireçtaşı ile son bulmaktadır. Araştırmada, birimden derlenen 43 örnek üzerinde çalışılmıştır. Bu örneklerde yapılan paleontolojik çalışmalar sonucunda tuzluluk açısından iki grup ostrakod topluluğu tanımlanmıştır. Bunlar; Leptocythere nodigera Pokorny, Leptocythere castanae (Sars), Loxoconcha rhombovalis Pokorny, Loxoconcha granifera (Reuss), Xestoleberis reymenti Ruggieri, Xestoleberis ventricosa Mueller, Cyprideis heterostigma sublittoralis Pokorny, Cyprideis sublittoralis Pokorny, Cyprideis torosa (Jones), Cyprideis trituberculata (Krstic)'den oluşan brahik ortam topluluğu ile Heterocypris salina salina (Brady), llyocypris bradyi (Sars), Cyclocypris sp., Candona candida (O.F.Muller), Candona neglecta Sars, Candona (Candona) parallela pannonica Zalanyi, Candona decimal Freels, Darwinula cylindrica Straub, Darwinula stevensoni (Brady ve Robertson) tatlısu ortamı topluluğudur. Bu fosillere göre adı geçen formasyonun oluşum ortamının, kıyı çizgisi boyunca gelişmiş karadan beslenmeli bir lagün olduğu söylenebilir. Sonuçta, bu çalışmada Sarmasiyen olarak bilinen Bakırköy formasyonu'nun yaşı, değinilen fosil topluluğu ve inceleme alanının doğusundaki İstanbul yeşil kiline verilen Messiniyen=Ponsiyen yaşı ile de deneştirilerek Ponsiyen olarak değerlendirilmiştir.The aim of this study is to determine of ostracode fauna, to do their chronostratigraphical and environmental evolution of Bakırköy formation Which crops out BahÇelievler, Cennet Mahallesi and Avcılar (İs-tanbul-KüÇükmece) according to new observations. Argillaceous limestone, claystone and fossiliferous limestone levels of Bakırköy formation have been observed which concordantly overly Güngören formation that named as İstanbul green clay in measured section of Avcılar, KüÇükÇekmece. Bakırköy formation also is represented by limestones and argillaceous limestones which those overlying claystones at Cennet Mahallesi which is located in the eastern part of investigated area. Bakırköy formation consists of the alternation of fossiliferous, argilleous limestone, claystone and sandy limestone at the uppermost of BahÇelievler measured section. 43 samples have been collected and studied from this unit with this research As a result of paleontological studies, two different ostracode associations have been described according to the percentage of salinity. Leptocythere nodigera Pokorny, Leptocythere castanae (Sars), Loxoconcha rhombovalis Pokorny, Loxoconcha granifera (Reuss), Xestoleberis reymenti Ruggieri, Xestoleberis ventricosa Mueller, Cyprideis heterostigma sublittoralis Pokorny, Cyprideis sublittoralis Pokorny, Cyprideis torosa (Jones), Cyprideis trituberculata (Krstic) are brakisch ostracodes and Heterocypris salina salina (Brady), llyocypris bradyi (Sars), Cyclocypris sp.,Candona Candida (O.F.Muller), Candona neglecta Sars, Candona (Candona) parallela pannonica Zalanyi, Candona decimal Freels, Darwinula cylindrica Straub, Darwinula stevensoni (Brady ve Robertson) are from the freshwater association. According to this microfauna content, Bakırköy formation has been deposited in a lagoon which has mostly continental in put. Finally, Bakırköy formation which is dated Sarmatian in the previous studies, has been evaluated Pontian in age according to the ostracode fauna and by the correlation of Messinian-Pontian aged green clays of Istanbul from the eastern part of the study area
Notes on beyrichiacean ostracodes from the Early Devonian of NW Turkey andtheir palaeobiogeographical relations
No full textRecently found materials of large beyrichiacean ostracodes from the Early Devonian of the Darlık, Korucuköy, and Kabalakdere sections in NW Anatolia stimulated the restudy of ostracode collections from the İstanbul area, including the Toula collection (GBA Vienna) and Endriss collection (previously in GPI Marburg and currently in SMF Frankfurt), and their biostratigraphical and palaeogeographical significance. The species Gibba kayseri, Gibba schmidti, Zygobeyrichia roemeri, Zygobeyrichia subcylindrica, and Zygobeyrichia onusta are documented and beyrichiid gen. et sp. indet. is described. There are great similarities with ostracode faunas from Early Devonian shallow-water sediments of Europe and North Africa (in Germany from the Rhenish Schiefergebirge to Thuringia, northern France, Spain, Poland, Bohemia, Podolia, Moravia, and North-West Africa). Therefore, this distribution questions the presence of a deeper and wider Rheic Ocean, which would be difficult for shallow-water benthic organisms to cross
Late Tertiary ostracodes of Salbaş- İmamoğlu (Adana) region
No full textBu çalışmanın amacı, Adana Baseni, Salbaş-İmamoğlu yöresinde. Geç Tersiyer yaşlı ostrakod faunasını incelemek ve sistematik olarak tanıtmaktır. Bu amaçla, Geç Tersiyer yaşlı birimler olan Kuzgun ve Handere formasyonlarından 5 kesit ölçülmüş ve 150 örnek derlenmiştir. Yapılan çalışmalar sonucunda 32 cins ve 53 tür saptanmıştır. Bu ostrakodlara göre inceleme alanının Geç Tersiyer döneminde ılık, tuzlu ve sığ denizel bir ortamın etkisi altında kaldığı belirlenmiştir.The aim of this study is to describe the late Tertiary aged Ostracoda fauna around Salbaş-İmamoğlu, Adana basin, and to introduce systematically them. In this aim 5 stratigraphical section have been measured and 150 paleontological samples have been collected from late Tertiary aged Kuzgun and Handere formation. As a result, 32 genera and 53 species of ostracodes have been fixed in late Tertiary aged units. According to these ostracodes, the study area have been affected from, warm, salty and shallow marine environment in late Tertiary time
Sedimentology and paleontology with special reference to the ostracoda fauna of Akyatan lagoon(Adana-SE Turkey)
No full textAkyatan, a lagoon on the Seyhan-Ceyhdn-Tarsus deltaic plain lies between Karataş and Tuzla approximately 42 km south of Adana. It is elongate, parallel to the shoreline with an inlet providing access to the sea in the sputh east. It is separated from the adjacent Mediterranean by a beach dune ridge fringed with reed beds. The mainland shore is formed of algal flats with thick reed beds where fresh water canals enter the lagoon. Water depths vary 80-100 cm and increase towards the inlet; they vary with the season. The lagoon is floored with silty clays and clayey silts. The uppermost sediments are at least 2620+70 yrs BP (as determined by radiocarbon dating of thin buried peat layer). Water temperatures vary from 11-12 ° C in winter, 18-23 ° C spring to 30 ° C in summer. Salinities vary from 30-45 %o in winter to 9-12 %o in spring (due to the heavy rain and influx of fresh water through canals) to 25-50 %o in summer. pH of the lagoon water varies from 7.5-9. The most extreme conditions are found in the north westerly inner lagoon away from the inlet and fresh water canal influx. A study has been completed of 4 cores (79 samples) along the axis of the lagoon which were collected by G.Evans and N.Görür of Imperial College with help from staff METU and MTA in 1975. 15 Ostracoda species were determined. These species are Cyprideis torosa (Jones), Neocyprideis subulata (Brady), Heterocypris salina (Brady), Eucypris dulcifons (Diebel and Pietrzenuik), Eucypris nsp., Loxoconcha elliptica Brady, Leptocythere lacertosa (Hirschmann), Candona neglecta Sars, Candona angulata G.W.Mueller, Candona (C.) parallela pannonica (Zdlanyi), Darwinula stevensoni (Brady and Robertson), Ilyocypris gibba (Ramdhor), I. biplicata (Koch), Lymnocythere inopinata (Baird), Aurila convexa (Baird), Candona sp. 1, Candona sp.2 Generally, the assemblage was of great abundance and low diversity: In addition, Pelecypoda, Gastropoda, benthic Foraminiferida, and Charophyta also accompany the Ostracoda association. The lagoon supports a rich fish population which is actively exploited and is a valuable site for resident flocks of flamingoes and migrant birds.Akyatan, a lagoon on the Seyhan-Ceyhdn-Tarsus deltaic plain lies between Karataş and Tuzla approximately 42 km south of Adana. It is elongate, parallel to the shoreline with an inlet providing access to the sea in the sputh east. It is separated from the adjacent Mediterranean by a beach dune ridge fringed with reed beds. The mainland shore is formed of algal flats with thick reed beds where fresh water canals enter the lagoon. Water depths vary 80-100 cm and increase towards the inlet; they vary with the season. The lagoon is floored with silty clays and clayey silts. The uppermost sediments are at least 2620+70 yrs BP (as determined by radiocarbon dating of thin buried peat layer). Water temperatures vary from 11-12 ° C in winter, 18-23 ° C spring to 30 ° C in summer. Salinities vary from 30-45 %o in winter to 9-12 %o in spring (due to the heavy rain and influx of fresh water through canals) to 25-50 %o in summer. pH of the lagoon water varies from 7.5-9. The most extreme conditions are found in the north westerly inner lagoon away from the inlet and fresh water canal influx. A study has been completed of 4 cores (79 samples) along the axis of the lagoon which were collected by G.Evans and N.Görür of Imperial College with help from staff METU and MTA in 1975. 15 Ostracoda species were determined. These species are Cyprideis torosa (Jones), Neocyprideis subulata (Brady), Heterocypris salina (Brady), Eucypris dulcifons (Diebel and Pietrzenuik), Eucypris nsp., Loxoconcha elliptica Brady, Leptocythere lacertosa (Hirschmann), Candona neglecta Sars, Candona angulata G.W.Mueller, Candona (C.) parallela pannonica (Zdlanyi), Darwinula stevensoni (Brady and Robertson), Ilyocypris gibba (Ramdhor), I. biplicata (Koch), Lymnocythere inopinata (Baird), Aurila convexa (Baird), Candona sp. 1, Candona sp.2 Generally, the assemblage was of great abundance and low diversity: In addition, Pelecypoda, Gastropoda, benthic Foraminiferida, and Charophyta also accompany the Ostracoda association. The lagoon supports a rich fish population which is actively exploited and is a valuable site for resident flocks of flamingoes and migrant birds
Kuvaterner sedimentlerinin ortamsal yorumu: Küçüksu Kasrı ( İstanbul Boğazı, Anadolu Hisarı - Türkiye )
No full textBu çalışmada, Küçüksu Kasrı temel sondajlarından alınan örneklerin ostrakod ve foraminifer içeriği incelenmiştir. Sondajlar, Paleozoyik temel üzerinde Kuvatemer istifini tamamen kesmektedir. Kuvatemer istifinin kalınlığı 12.5 m ile 25.1 m arasında değişmektedir. Bu istif, çakıllı kum, ince-iri taneli kum, silt ve çamuriu seviyelerie karekteristiktir. 8 sondajdan alınan örneklerin 82 tanesi ostrakod, 77 tanesi de foraminifer içermektedir. Kuvatemer sedimentlerinin ortamsal yorumu, en yaygın olarak görülen ostrakod cinsleri (Cyprideis, Tyrrenocythere, Xestoleberis, Loxoconcha, Callistocythere and Aurila) ve foraminifer cinslerine (Rosalina, Lobatula and Ammonia) göre yapılmıştır. Belirtilen cinsler sedimentlerin depolanma ortamının denizel ve brahik koşullarda olduğunu göstermektedir. .The ostracodes and foraminifera included in the samples coming from the foundation boreholes drilled at KüÇüksu Palace (Istanbul) were studied. These drillings penetrated through the Quaternary sediments underlain by the Palaeozoic basement. Thickness of the Quaternary sequence ranges from 12.5 to 25.1 meters. This sequence is characterized by pebbly sand, coarse to fine sand, silt and mud levels. 82 samples recovered from 8 drillings contain ostracodes, while 77 samples have foraminifera. Environmental interpretation of the Quaternary sediments was given depending on dominant ostracode genera (Cyprideis, Tyrrenocythere, Xestoleberis, Loxoconcha, Callistocythere and Aurila) and foraminifer genera (Rosalina, Lobatula and Ammonia). Existence of genera mentioned, above indicates that the depositional environment corresponds to the marine and brackish water conditions
Vertical distribution of Holocene ostracoda at Anadolu Hisarı (Bosphorus-İstanbul)
No full textThe vertical distribution of the Holocene ostracods of Anadolu Hisarı has been studied for 36 sediment samples from four boreholes. Forty-four Ostracoda species were determined. Four ostracod assemblages were identified from these species. These assemblages are dominated respectively by; Aurila convexa (Baird); Xestoleberis aurantia (Baird); X. depressa Sars; andTyrrenocythere amnicola (Sars). In general, the fauna exhibits low diversity and richness. Finally, Q-mode cluster analysis was applied to the Bray-Curtis measure of similarity.The vertical distribution of the Holocene ostracods of Anadolu Hisarı has been studied for 36 sediment samples from four boreholes. Forty-four Ostracoda species were determined. Four ostracod assemblages were identified from these species. These assemblages are dominated respectively by; Aurila convexa (Baird); Xestoleberis aurantia (Baird); X. depressa Sars; andTyrrenocythere amnicola (Sars). In general, the fauna exhibits low diversity and richness. Finally, Q-mode cluster analysis was applied to the Bray-Curtis measure of similarity
Evidences about Messinian Salinity Crisis in the Upper Miocene-Pliocene sequence of the Adana Basin
No full textBu çalışmada; Adana Baseni sedimanter istifine ait Geç Miyosen-Pliyosen zaman aralığındaki jeolojik olaylar sedimantolojik ve paleontolojik veriler kullanılarak incelenmiştir. Adana Baseni Üst Miyosen-Pliyosen istifi, "Messiniyen Tuzluluk Krizi" olarak bilinen katastrofik bir olayın izlerini taşımaktadır. Geç Miyosen'de tektonikçe kontrol edilen bu olaylar, Akdeniz çevresindeki tüm havzaları etkilemiştir. "Messiniyen Tuzluluk Krizi" yaklaşık 6 milyon yıl önce, Akdeniz'in kurumaya başlamasıyla oluşmuştur. Ortaya çıkan olağanüstü ortamsal değişim ise biyotayı olumsuz etkilemiştir. Çalışma bölgesinde Üst Miyosen istifinin özellikle Tortoniyen bölümünde fosil türleri sayıca çoktur, ancak Geç Miyosen-Pliyosen geçişinde türlerin sayıca azaldıkları veya yokoldukları saptanmıştır. Tortoniyen-Messiniyen geçişindeki kırıntılı istif içerisinde planktik foraminiferlerden Globorotalia suterae Catalona ve Sprovieri tanımlanmış olup, bu form bölgenin kriz sürecine girdiğini göstermektedir. Messiniyen'de bölgede, bazılarına akarsuların kırıntılı sediman getirdiği lagünler yeralmıştır. Bu dönem için herhangi bir biyolojik faaliyetin izleri saptanamamıştır. İnceleme alanındaki Pliyosen istifi kanal dolguları şeklindeki akarsu konglomerasıyla başlar, üste doğru sığ denizel kumtaşı-çamurtaşı ardalanmasına geçer, ince taneli bu birimlerin bazı seviyelerinin planktik foraminiferce zengin olduğu görülmüştür. Erken Pliyosen yaşlı Atlantik Provensi'nde Globorotalia margarita margarita Zonu'na karşılık gelen Sphaeroidenellopsis seminulina (Schwager) ve S. dehiscens (Parker ve Jones) planktik foraminiferleri saptanmıştır.In this study, the geological events of the late Miocene-Pliocene units in the Adana Basin have been investigated by using the sedimentological and paleontological data. The Upper Miocene-Pliocene units of the Adana Basin have geological records of a catastrophic event known as -Messinian Salinity Crisis-. These events, controlled by tectonics, affected all the sedimentary basins around the Mediterranean. -Messinian Salinity Crisis- occurred as a result of designation of Mediterranean approximately 6 million years ago. This unusual environmental change negatively affected the biota. In the study area, species were numerous particularly during Tortonian, but it was determined that species either decreased or disappeared at the boundary of the late Miocene and Pliocene. Globorotalia suterae Catalona and Sprovieri from planktic foraminifera were recognized within the clastic unit at the boundary of Tortonian-Messinian. This form indicated that the study area had been entered in a crisis time. At the Messinian, the study area was a lagoonal-fluvial environment. There was no biological events observed during this time interval. The Pliocene units of the study area start with channellised fluvial conglomerates and passes up into shallow marine sandstone-mudstone intercalations. Some levels of these fine-grained units are rich in planktic foraminifera. Early Pliocene aged Sphaeroidenellopsis seminulina (Schwager) and S. dehiscens (Parker and Jones) planktic foraminifers which represent Globorotalia margarita margarita Zone of Atlantic province have been identified among these fossils
Holocene coastal change in the ancient harbor of Yenikapi-Istanbul and its impact on cultural history
No full textWOS: 000292175700004An extensive rescue excavation has been conducted in the ancient harbor of Istanbul (Yenikapi) by the Sea of Marmara, revealing a depositional sequence displaying clear evidence of transgression and coastal progradation during the Holocene. The basal layer of this sequence lies at 6 m below the present sea level and contains remains of a Neolithic settlement known to have been present in the area, indicating that the sea level at similar to 8-9 cal ka BP was lower than 6 m below present. Sea level advanced to its maximum at similar to 6.8-7 cal ka BP, drowning Lykos Stream and forming an inlet at its mouth. After similar to 3 cal ka BP, coastal progradation became evident. Subsequent construction of the Byzantine Harbor (Theodosius; 4th century AD) created a restricted small basin and accumulation of fine-grained sediments. The sedimentation rate was increased due to coastal progradation and anthropogenic factors during the deposition of coarse-grained sediments at the upper parts of the sequence (7th-9th centuries AD). The harbor was probably abandoned after the 11th century AD by filling up with Lykos Stream detritus and continued seaward migration of the coastline. (C) 2011 University of Washington. Published by Elsevier Inc. All rights reserved.Istanbul UniversityIstanbul University [ONAP-472]We are grateful to Directors Dr. Ismail Karamut, Zeynep Kiziltan, chief archeologists Metin Gokcay and Yasar Anihr, and site archeologist Sim Comlekci for their valuable and kind help at the field study. We thank Dr. Baki Yokes for identifying mollusk samples for radiocarbon analysis. We are indebted to Prof. Peter Kuniholm and Dr. Charlotte Pearson for improving the English language of the manuscript. We acknowledge two anonymous reviewers and Senior Editor Dr. D. B. Booth for their constructive comments on the earlier version of the manuscript. The present work was supported by the Research Fund of Istanbul University, project number ONAP-472
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