Öz The Riva-Çayağzı Creek (İstanbul, Black Sea) pours into the Black Sea from the coasts of Turkey. In the drainage basin of this creek, both deep and shallow drillings were undertaken, and the minimum thickness of Holocene stratigraphy was determined as 30 m. The Holocene young deposits are mainly composed of fine-grained sediments and clay, which has the most prominent thickness. The energy of water during the sedimentation process was low and stagnant in the Riva-Çayağzı Creek basin. When the marine mollusc fossils obtained from the shallow boring cores are evaluated, it can be deduced that the sea level in the study area had drawdown to -21 m in elevation. Ostracod, foraminifer, and diatom fossils determined in all cores of shallow borings are the same or similar to Mediterranean origin euryhaline forms. According to this outcome, the presence of brackish water in the study area is the result of the sea level rise that occurred at ca. 9.4 ka due to the Mediterranean origin fluctuations passing through the Dardanelles and Bosphorus straits into the Black Sea. Thus, it is understood that the sea level entered from the present Riva (İstanbul)-Black Sea coastline to at least 13 km south of the Çayağzı Creek drainage basin. The Early Holocene transgression has been defined for the first time here in the specific location of the Black Sea coast of Turkey. Accordingly, in the Riva-Çayağzı Creek basin, a lagoon sedimentation environment with low energy and stagnant water, having mainly brackish water with partial seasonal change and sea connection, was determined.
Algan O, Ergin M, Keskin Ş, Gökaşan E, Alpar B et al. (2007). Sealevel changes during the late Pleistocene-Holocene on the southern shelves of the Black Sea. In: Yanko-Hombach V, Gilbert AS, Panin N, Dolukhanov P (editors). The Black Sea Flood Question: Changes in Coastline, Climate, and Human Settlement. New York, NY, USA: Springer, pp. 603-631.
Altınsaçlı S, Perçin PF, Altınsaçlı S (2018). Assessments of environmental variables affecting the spatiotemporal distribution and habitat preferences of living Ostracoda (Crustacea) species in the Enez Lagoon Complex (Enez-Evros Delta, Turkey). Ecologica Montenegrina 19: 130-151.
Andrussov NÝ (1896). Expedition of ‘Selanica’ in the Sea of Marmara in 1894. Marmara Sea, Notes on Russian Islands Geography 33: 2 (in Russian).
Arslanov KA, Lokshin NV, Mamedov AV (1988). On the age of Khazarian, Khvalynian and New Caspian deposits of the Caspian Sea. Bulletin of Commission Investigation in Russian Quaternary Period 57: 28-38.
Badertscher S, Fleitmann D, Cheng H, Edwards RL, Göktürk OM et al. (2011). Pleistocene water intrusions from the Mediterranean and Caspian seas into the Black Sea. Nature Geoscience 4: 236- 239.
Bahr A, Lamy F, Arz H, Kuhlman H, Wefer G (2005). Late glacial to Holocene climate and sedimentary history in the NW Black Sea. Marine Geology 214: 309-322.
Balabanov IP (2006). Holocene sea-level changes in the Northern Black Sea. Extended Abstract. In: Second Plenary Meeting, Project IGCP-521. Odessa, Ukraine: Astroprint, pp. 21-23.
Balabanov IP (2007). Holocene sea-level changes of the Black Sea. In: Yanko-Hombach V, Gilbert AS, Panin N, Dolukhanov P (editors). The Black Sea Flood Question: Changes in Coastline, Climate, and Human Settlement. New York, NY, USA: Springer, pp. 711-730.
Ballard RD, Coleman DF, Rosenberg GD (2000). Further evidence of abrupt Holocene drowning of the Black Sea shelf. Marine Geology 110: 253-261.
Bonaduce G, Ciampo G, Masoli M (1975). Distribution of Ostracoda in the Adriatic Sea. Naples, Italy: Pubblicazioni della Stazione Zoologica di Napoli.
Breman E (1975). The Distribution of Ostracodes in the Bottom Sediments of the Adriatic Sea. Amsterdam, the Netherlands: Vrije Universiteit te Amsterdam, Krips Repro, Meppel.
Briceag A, Yanchilina A, Ryan WB, Stoica M, Melinte‐Dobrinescu MC (2019). Late Pleistocene to Holocene paleoenvironmental changes in the NW Black Sea. Journal of Quaternary Science 34 (2): 87-100.
Bronshtein ZS (1947). Freshwater Ostracoda Fauna of the U.S.S.R. – Crustaceans, Vol. II, No: 1. Moscow, USSR: Academy of Sciences of the USSR Publishers (in Russian).
Büyükmeriç Y (2016). Postglacial floodings of the Marmara Sea: molluscs and sediments tell the story. Geo-marine Letters 36 (4): 307-321.
Büyükmeriç Y, Tekin E, Herece E, Sözeri K, Akca N et al (2018). Early Pliocene molluscs from the easternmost Mediterranean region (SE Turkey): biostratigraphic, ecostratigraphic, and palaeobiogeographic implications. Turkish Journal of Earth Sciences 27: 127-151.
Çağatay MN, Görür N, Algan O, Eastoe C, Chepalyga A et al. (2000). Late Glacial-Holocene palaeoeanography of the Sea of Marmara: timing of connections with the Mediterranean and the Black Seas. Marine Geology 167: 191-206.
Chekhovskaya MP, Stepanova AY, Khusid TA, Matul AS, Rakowski AZ (2014). Late Pleistocene – Holocene ostracod assemblages of the Northern Caspian Sea Shelf. Oceanology 54: 212-221.
Chepalyga A (1995). Plio-Pleistocene Black sea basins and the connections with the Mediterranean. In: Meriç E (editor). Quaternary Sequence of İzmit Bay. İstanbul, Turkey: Deniz Harb Okulu Komutanlığı Basımevi, pp. 303-311 (in Turkish).
Cohn N (1996). Noah’s Flood. The Genesis Story in Western Thought. New Haven, CT, USA: Yale University Press. Danukalova GA (1996). Bivalves and Aktschagylian Stratigraphy. Moscow, Russia: Nauka (in Russian).
Degens ET, Ross, DA (1972). Chronology of the Black Sea over the last 25 000 years. Chemical Geology 10: 1-16.
Fedorov PV (1978). Pleistocene of the Ponto-Caspian Region. Moscow, USSR: Nauka (in Russian).
Folk RL, Ward WC (1957). Brazos River bar: a study in the significance of grain-size parameters. Journal Sedimentary. Petrology 27: 3-26.
Görür N, Çağatay NM, Emre Ö, Alpar B, Sakınç M et al. (2001). Is the abrupt drowning of the Black Sea shelf at 7150 yr BP a myth? Marine Geology 176: 65-73.
Hiscott RN, Aksu AE, Mudie PJ, Kaminski MA, Abrajano T et al. (2007). The Marmara Sea gateway since ~16 ky BP: noncatastrophic causes of palaeoceanographic events in the Black Sea at 8.4 and 7.15 ky BP. In: Yanko-Hombach V, Gilbert AS, Panin N, Dolukhanov P (editors). The Black Sea Flood Question: Changes in Coastline, Climate, and Human Settlement. New York, NY, USA: Springer, pp. 89-117.
Horne DJ, Boomer I (2000). The role of Ostracoda in saltmarsh meiofaunal communities. In: Sherwood BR, Gardiner BG, Harris T (editors). British Saltmarshes. Cardigan, UK: Forrest Text (for the Linnean Society of London).
Huvaj Y, Huff W (2016). Clay mineralogy and geochemistry of three offshore wells in the southwestern Black Sea, northern Turkey: the effect of burial diagenesis on the conversion of smectite to illite. Turkish Journal of Earth Sciences 25: 592-610.
İslamoğlu Y (2002). Neoeuxinian–Holocene molluscan fauna of the southern part of the Marmara Sea between Gemlik and Bandırma Bay (NW Turkey). In: Yılmaz A (editor). Oceanography of the Eastern Mediterranean and Black Sea - Similarities and Differences of Two Interconnected Basins. Ankara, Turkey: TÜBİTAK, pp. 953-960 (in Turkish).
İslamoğlu Y, Chepalyga AL (1998). The environmental changes determined with Molluscan assemblages during the Neoeuxinian-Holocene stages in the Sea of Marmara. Geological Bulletin of Turkey 41: 55-62.
İslamoğlu Y, Harzhauser M, Gross M, Jiménoz-Moreno G, Coric S et al. (2008). From Tethys to Eastern Paratethys: Oligocene depositional environments, paleoecology and paleobiogeography of the Thrace Basin (NW Turkey). International Journal of Earth Science 99: 183-200.
Ivanova EV, Murdmaa IO, Karpuk MS, Schornikov EI, Marret F et al. (2012). Paleoenvironmental changes on the northeastern and southwestern Black Sea shelves during the Holocene. Quaternary International 261: 91-104.
Klie W (1938). Ostracoda, Muschelkrebse. In: Dahl M, Bischoff H (editors). Die Tierwelt Deutschlands und der angrenzenden Meeresteile nach ihren Merkmalen und nach ihrer Lebensweise (Krebstiere oder Crustacea). Jena, Germany: Gustav Fischer, p. 230 (in German).
Konikov E (2007). Sea-level fluctuations and coastline migration in the Northwestern Black Sea area over the last 18 ky based on high resolution lithologicalgenetic analysis of sediment architecture. In: Yanko-Hombach V, Gilbert AS, Panin N, Dolukhanov P (editors). The Black Sea Flood Question: Changes in Coastline, Climate, and Human Settlement. New York, NY, USA: Springer, pp. 405-435.
Koral H (2007). Sea-level changes modified the Quaternary coastlines in the Marmara region, northwestern Turkey: What about tectonic movements? In: Yanko-Hombach V, Gilbert AS, Panin N, Dolukhanov P (editors). The Black Sea Flood Question: Changes in Coastline, Climate, and Human Settlement. New York, NY, USA: Springer, pp. 571-601.
Krijgsman W, Tesakov A, Yanina T, Lazarev S, Danukalova G et al. (2019). Quaternary time scales for the Pontocaspian domain: interbasinal connectivity and faunal evolution. Earth Science Reviews 188: 1-40. Kubanç C (2003). Ostracoda (Crustacea) fauna of the Black Sea Coasts of İstanbul. Turkısh Journal Marine Science 9: 147-162. Kubanç C (2005). New records of recent Ostracoda (Crustacea) for the marine fauna of Turkey. Zoology in the Middle East 36 (1): 43-50.
Kvasov DD (1975). Late Quaternary History of Large Lakes and Closed Seas of Eastern Europe. Moscow, USSR: Nauka (in Russian).
Lericolais G, Guichard F, Morigi C, Minereau A, Popescu I, et al. (2010). A post Younger Dryas Black Sea regression identified from sequence stratigraphy correlated to core analysis and dating. Quaternary International 225: 199-209.
Lericolais G, Guichard F, Morigi C, Popescu I, Bulois C et al. (2011). Assessment of Black Sea water-level fluctuations since the Last Glacial Maximum. In: Buynevich IV, Yanko-Hombach V, Gilbert AS, Martin RE (editors). Geology and Geoarchaeology of the Black Sea Region: Beyond the Flood Hypothesis. Boulder, CO, USA: GSA, pp. 33-50.
Lericolais G, Popescu I, Guichard F, Popescu SM (2007). A Black Sea Lowstand at 8500 yr BP Indicated by a Relict Coastal Dune System at a Depth of 90 m Below Sea Level. Boulder, CO, USA: Special Paper of the Geological Society of America.
Major C, Ryan W, Lericolais G, Hajdas I, (2002). Constraints on Black Sea out flow to the Sea of Marmara during the last glacialinterglacial transition. Marine Geology 190: 19-34.
Manheim FT, Chan KM (1974). Interstitial Waters of Black Sea Sediments: New Data and Review: Water. In: Degens ET (editor). The Black Sea–Geology, Chemistry, and Biology. Boulder, CO, USA: GSA, pp. 155-180.
Martin RE, Yanko-Hombach V (2011). Repeated freshwater discharge events stimulated rapid sea-level change in the Black Sea during the Holocene. In: Buynevich IV, Yanko-Hombach V, Gilbert AS, Martin RE (editors). Geology and Geoarchaeology of the Black Sea Region: Beyond the Flood Hypothesis. Boulder, CO, USA: GSA, pp. 51-58.
Mayewski PA, Rohling EE, Stager JC, Karlén W, Maasch KA et al. (2004). Holocene climate variability. Quaternary Research 62 (3): 243-255.
Mazzini I, Rossi V, Da Prato S, Ruscito V (2017). Ostracods in archaeological sites along the Mediterranean coastlines: three case studies from the Italian peninsula. In: Williams M, Hill T, Boomer I, Wilkinson IP (editors). The Archaeological and Forensic Applications of Microfossils: A Deeper Understanding of Human History. London, UK: Special Publications of the Geological Society, pp. 121-142.
Meisch C (2000). Crustacea: Ostracoda. In: Schwoerbel J, Zwick P (editors). Süßwasserfauna von Mitteleuropa. Heidelberg, Germany: Spektrum Akademischer Verlag, p. 522 (in German).
Mertens KN, Bradley LR, Takano Y, Mudie PJ, Marret F et al. (2012). Quantitative estimation of Holocene surface salinity variation in the Black Sea using dinoflagellate cyst process length. Quaternary Science Reviews 39: 45-59.
Mischke S, Schudack U, Bertrand S, Leroy SA (2012). Ostracods from a Marmara Sea lagoon (Turkey) as tsunami indicators. Quaternary International 261: 156-161.
Mudie PJ, Yanko-Hombach VV, Kadurin SV (2014). The Black Sea dating game and Holocene marine transgression. Open Journal of Marine Science 4: 1-7.
Nazik A, Evans G, Gürbüz K (1999). Sedimentology and paleontology with special reference to the Ostracoda fauna of Akyatan Lagoon (Adana-SE Turkey). Geosound Special Issue 35: 127-148.
Neubauer TA, Harzhauser M, Mandic O, Georgopoulou E, Kroh A (2016). Paleobiography and historical biogeography of the nonmarine caenogastropod family Melanopsidae. Paleogeography, Paleoclimatology, Paleoecology 444: 124-143.
Nevesskaja LA (1965). Late Quaternary Bivalve Molluscs of the Black Sea, Their Systematics and Ecology. Trudy Paleontologicheskogo Instituta Akademii Nauk SSSR 105. Moscow, USSR: Nauka (in Russian).
Nevesskaja LA (1974). Molluscan shells in deep-water sediments of Black Sea. In: Degens ET (editor). The Black Sea–Geology, Chemistry, and Biology. Boulder, CO, USA: GSA, pp. 349-352.
Ostrovsky AB, Izmaylov YA, Scheglov AP (1977). New data on a stratigraphy and geochronology of the Pleistocene marine terraces of the Black Sea coast of the Caucasus and KerchTaman area. In: Paleogeography and Deposits of the Pleistocene of the Southern Seas of the USSR. Moscow, USSR: Nauka, pp. 61-68 (in Russian).
Özgül N (2012). Stratigraphy and some structural features of the İstanbul Paleozoic. Turkish Journal of Earth ScienceS 21: 817- 866.
Perçin F, Kubanç C (2005). The coastal Ostracoda (Crustacea) fauna of the bay of İskenderun. Istanbul University Journal of Fisheries Aquatic Sciences 19: 41-54.
Pint A, Frenzel P, Fuhrmann R, Scharf B, Wennrich V (2012). Distribution of Cyprideis torosa (Ostracoda) in Quaternary athalassic sediments in Germany and its application for palaeoecological reconstructions. International Review of Hydrobiology 97: 330-355.
Ryan WBF (2007). Status of the Black sea flood hypothesis. In: YankoHombach V, Gilbert AS, Panin N, Dolukhanov P (editors). The Black Sea Flood Question: Changes in Coastline, Climate, and Human Settlement. New York, NY, USA: Springer, pp. 63-88.
Ryan WBF, Pitman WC 3rd, Major CO, Shimkus K, Maskalenko V et al. (1997). An abrupt drowning of the Black Sea shelf. Marine Geology 138: 119-126.
Ryan WBF, Pitman W (1998). Noah’s Flood: The New Scientific Discoveries about Events that Changed History. New York, NY, USA: Simon and Schuster.
Ryan WBF, Vachtman D, McHugh C, Çağatay MN, Mart Y (2014). A channeled shelf fan initiated by flooding of the Black Sea. In: Goffredo S, Dubinsky Z (editors). The Mediterranean Sea. Dordrecht, the Netherlands: Springer, pp. 11-27.
Şafak Ü (2003). Recent ostracodes of the Yumurtalık Gulf. Mineral Research Exploration Bulletin 126: 1-10.
Selivanov AO (1996). Changes of Global Sea Level in the Pleistocene - the Holocene and Development of Sea Coasts. Moscow, Russia: Institute of Water Problems (in Russian).
Soulet G, Delaygue G, Vallet-Coulomb C, Böttcher ME, Sonzogni C et al. (2010). Glacial hydrologic conditions in the Black Sea reconstructed using geochemical pore water profiles. Earth and Planetary Science Letters 296: 57-66.
Soulet G, Ménot G, Lericolais G, Bard E (2011). A revised calendar age for the last reconnection of the Black Sea to the global ocean. Quaternary Science Reviews 30 (9-10): 1019-1026.
Stoica M, Floroiu A (2008). Recent ostracod faunas from MD04- 2770 (Black Sea). In: Gilbert A, Yanko-Hombach V (editors). Extended Abstracts of the Fourth Plenary Meeting and Field Trip of IGCP-521 “Black Sea and Mediterranean Corridor during the Last 30 ky: Sea Level Change and Human Adaptation” (2005-2010) and INQUA 0501 “Caspian-Black Sea-Mediterranean Corridor during Last 30 ky: Sea Level Change and Human Adaptive Strategies” (2005-2011). Bucharest, Romania and Varna, Bulgaria, p. 173.
Svitoch AA (2010). The Neoeuxinian basin of the Black Sea and the Khvalinian transgression of the Caspian Sea. Quaternary International 225: 230-234.
Svitoch AA, Parunin OB, Yanina TA (1994). Radio-carbon chronology of deposits and events of the late Pleistocene of the Ponto-Caspian. In: Geochronology of the Quaternary Period. Moscow, Russia: Nauka, pp. 75-82 (in Russian).
Svitoch AA, Parunin OB, Yanina TA (1995). Marine Holocene of the coast of Bulgaria (biostratigraphy, chronology, correlation). In: Correlation of the Paleogeographical Events: The Continent - the Shelf - the Ocean. Moscow, Russia: Moscow University, pp. 203-217 (in Russian).
Svitoch AA, Selivanov AO, Yanina TA (1998). Paleogeographical Events in the PontoCaspian and Mediterranean Regions: Materials on Reconstructions and Correlations. Moscow, Russia: RASKhN Press (in Russian).
Taviani M, Angeletti L, Çağatay MN, Gasperini L, Polonia A et al. (2014). Sedimentary and faunal signatures of the post-glacial marine drowning of the Pontocaspian Gemlik lake (Sea of Marmara). Quaternary International 345: 11-17.
Taviani M, Wesselingh FP, Angeletti L, Çağatay N (2013). Changing biogeographic identity: Mediterranean vs Pontocaspian mollusc turnover in the record of the Gulf of Gemlik marks the post-glacial marine inundation of a secluded embayment of the Sea of Marmara. In: Abstracts Volume IGCP 610, From the Caspian to Mediterranean: Environmental Change and Human Response during the Quaternary, 12–19 October 2013, Tbilisi, Georgia, pp. 139-140.
Tawfık M, El-Sorogy A, Moussa M (2017). Relationships between sequence stratigraphy and diagenesis of corals and foraminifers in the Middle Eocene, northern Egypt. Turkish Journal of Earth Sciences 26: 147-169.
Tchepalyga AL (1980). Paleogeographiya i paleoecologiya basseinov Chernogo i Kaspiyskogo morey (Ponto-Kaspiya) v PlioPleistotsene. PhD, Institute of Geography, Moscow, USSR (in Russian).
Vinogradov AP (1969). Atlas of Lithological-Paleogeographical Maps of the Soviet Union. Moscow, USSR. Vses. Aerogeol. Trest Mingeol. (in Russian).
Voskoboinikov VM, Rotar MF, Konikov EG (1982). Sviaz’ritmichnosti stroeniia tolshch golotsenovykh otlozhenii Prichernomorskikh limanov s kolebatel’nym rezhimom urovnia Chernogo moria Moscow, USSR: Moscow State University, pp. 264-274 (in Russian).
Yanchilina AG, Ryan WBF, McManus JF, Dimitrov P, Dimitrov D et al. (2017). Compilation of geophysical, geochronological, and geochemical evidence indicates a rapid Mediterranean-derived submergence of the Black Sea’s shelf and subsequent substantial salinification in the early Holocene. Marine Geology 383: 14- 34.
Yanina TA (2012). Correlation of the Late Pleistocene paleogeographical events of the Caspian Sea and Russian Plain. Quaternary International 271: 120-129.
Yanina TA (2014). The Ponto-Caspian region: Environmental consequences of climate change during the Late Pleistocene. Quaternary International 345: 88-99.
Yanko V, Gramova L (1990). Stratigraphy of the Quaternary sediments of the Caucasian shelf and continental slope of the Black Sea on microfauna (Foraminifera and Ostracoda). Journal of Soviet Geoscience 2: 60-72 (in Russian).
Yanko VV (1990a). Stratigraphy and palaeogeography of marine Pleistocene and Holocene deposits of the southern seas of the USSR. Memorie – Italian Geological Society 44: 167-187.
Yanko VV (1990b). Quaternary foraminifera of genus Ammonia of the Pontian-Caspian region. Paleontological Journal 1: 18-26.
Yanko-Hombach V (2007). Controversy over Noah’s Flood in the Black Sea: geological and foraminiferal evidence from the shelf. In: Yanko-Hombach V, Gilbert AS, Panin N, Dolukhanov P (editors). The Black Sea Flood Question: Changes in Coastline, Climate, and Human Settlement. New York, NY, USA: Springer, pp. 149-203.
Yanko-Hombach V, Gilbert AS, Dolukhanov PM (2007). Controversy over the great flood hypothesis in the Black Sea in light of geological, paleontological, and archaeological evidence. Quaternary International 167-168: 91-113.
Yanko-Hombach V, Kislov A (2018). Late Pleistocene-Holocene sealevel dynamics in the Caspian and Black Seas: data synthesis and paradoxical interpretations. Quaternary International 465: 63-71.
Yanko-Hombach V, Mudie PJ, Kadurin S, Larchenkov E (2014). Holocene marine transgression in the Black Sea: new evidence from the northwestern Black Sea shelf. Quaternary International 345: 100-118.