Articles | Volume 21, issue 8
https://doi.org/10.5194/cp-21-1405-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-21-1405-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
01 Aug 2025
Research article |
| 01 Aug 2025
| 01 Aug 2025
The Eocene–Oligocene Transition in the Paratethys: boreal water ingression and its paleoceanographic implications
Department of Geological Engineering, Middle East Technical University, Ankara, 06800, Türkiye
present address: Geological Institute, RWTH Aachen University, Aachen, Germany
Henk Brinkhuis
Oceans Systems Research (OCS), NIOZ Royal Netherlands Institute of Sea Research, Texel, 1790 AB, the Netherlands
Department of Earth Sciences, Laboratory of Palaeobotany and Palynology, Faculty of Geosciences, Utrecht University, 3584 CB Utrecht, the Netherlands
Chiara Fioroni
Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Modena e Reggio Emilia, Modena, 41121, Italy
Serdar Görkem Atasoy
Department of Geological Engineering, Middle East Technical University, Ankara, 06800, Türkiye
Alexis Licht
Aix-Marseille Université, CNRS, IRD, INRAE, Collège de France, CEREGE, Technopôle de l'Arbois-Méditerranée, BP80, 13545 Aix-en-Provence, France
Dirk Nürnberg
GEOMAR Helmholtz Centre for Ocean Research Kiel, 24148 Kiel, Germany
Taylan Vural
Department of Geological Engineering, Middle East Technical University, Ankara, 06800, Türkiye
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Cited articles
Abels, H. A., Dupont-Nivet, G., Xiao, G., Bosboom, R., and Krijgsman, W.: Step-wise change of Asian interior climate preceding the Eocene–Oligocene Transition (EOT), Palaeogeogr. Palaeocl., 299, 399–412, https://doi.org/10.1016/j.palaeo.2010.11.028, 2011.
Abelson, M. and Erez, J.: The onset of modern-like Atlantic meridional overturning circulation at the Eocene-Oligocene transition: Evidence, causes, and possible implications for global cooling, Geochem. Geophy. Geosy., 18, 2177–2199, https://doi.org/10.1002/2017GC006826, 2017.
Agnini, C., Fornaciari, E., Raffi, I., Catanzariti, R., Palike, H., Backman, J., and Rio, D.: Biozonation and biochronology of Paleogene calcareous nannofossils from low and middle latitudes, Newsl. Stratigr., 47, 131–181, https://doi.org/10.1127/0078-0421/2014/0042, 2014.
Aubry, M. P.: Late Paleogene Calcareous Nannoplankton Evolution: A Tale of Climatic Deterioration, in: Eocene-Oligocene Climatic and biotic evolution, edited by: Prothero D. R. and Berggren W. A., Princeton University Press, Princeton, USA, 272–309, http://www.jstor.org/stable/j.ctt7zvp65.18, 1992.
Auer, G., Piller, W. E., and Harzhauser, M.: High-resolution calcareous nannoplankton palaeoecology as a proxy for small-scale environmental changes in the Early Miocene, Mar. Micropaleontol., 111, 53–65, https://doi.org/10.1016/j.marmicro.2014.06.005, 2014.
Baatsen, M., von der Heydt, A. S., Huber, M., Kliphuis, M. A., Bijl, P. K., Sluijs, A., and Dijkstra, H. A.: The middle to late Eocene greenhouse climate modelled using the CESM 1.0.5, Clim. Past, 16, 2573–2597, https://doi.org/10.5194/cp-16-2573-2020, 2020.
Backman, J.: Quantitative Calcareous Nannofossil Biochronology of Middle Eocene through Early Oligocene Sediment from DSDP Sites 522 and 523, Abh. Geol. Bundesanst., 39, 21–31, 1987.
Barrier, E., Vrielynck, B., Brouillet, J. F., and Brunet, M. F.: Paleotectonic Reconstruction of the Central Tethyan Realm. Tectonono-Sedimentary-Palinspastic maps from Late Permian to Pliocene, Paris, Atlas of 20 maps (scale: 1
Bartol, M., Pavšič, J., Dobnikar, M., and Bernasconi, S. M.: Unusual Braarudosphaera bigelowii and Micrantholithus vesper enrichment in the Early Miocene sediments from the Slovenian Corridor, a seaway linking the Central Paratethys and the Mediterranean, Palaeogeogr. Palaeocl., 267, 77–88, https://doi.org/10.1016/j.palaeo.2008.06.005, 2008.
Bati, Z.: Dinoflagellate cyst biostratigraphy of the upper Eocene and lower Oligocene of the Kirmizitepe Section, Azerbaijan, South Caspian Basin, Rev. Palaeobot. Palyno. 217, 9–38, https://doi.org/10.1016/j.revpalbo.2015.03.002, 2015.
Bijl, P. K., Brinkhuis, H., Egger, L. M., Eldrett, J. S., Frieling, J., Grothe, A., Houben, A. J. P., Pross, J., Śliwińska, K. K., and Sluijs, A.: Comment on “Wetzeliella and its allies–the “hole” story: a taxonomic revision of the Paleogene dinoflagellate subfamily Wetzelielloideae” by Williams et al. (2015), Palynology, 41, 423–429, https://doi.org/10.1080/01916122.2016.1235056, 2017.
Brinkhuis, H.: Late Eocene to early Oligocene dinoflagellate cysts from the Priabonian type-area (Northeast Italy): biostratigraphy and paleoenvironmental interpretation, Palaeogeogr. Palaeocl., 107, 121–163, https://doi.org/10.1016/0031-0182(94)90168-6, 1994.
Brinkhuis, H. and Biffi, U.: Dinoflagellate cyst stratigraphy of the Eocene/Oligocene transition in central Italy, Mar. Micropaleontol., 22, 131–183, https://doi.org/10.1016/0377-8398(93)90007-K, 1993.
Brinkhuis, H. and Visscher, H.: The upper boundary of the Eocene Series: a reappraisal based on dinoflagellate cyst biostratigraphy and sequence stratigraphy, in: Geochronology, Time Scales and Global Stratigraphic Correlation, edited by: Berggren, W. A., Kent, D. V., Aubry, M.-P., and Hardenbol, J., SEPM, Special Publication, SEPM Society for Sedimentary Geology, 54, 295–304, https://doi.org/10.2110/pec.95.04.0295, 1995.
Brinkhuis, H., Schouten, S., Collinson, M. E., Sluijs, A., Damsté, J. S. S., Dickens, G. R., Huber, M., Cronin, T. M., Onodera, J., Takahashi, K., Bujak, J. P., Stein, R., van der Burgh, J., Eldrett, J. S., Harding, I. C., Lotter, A. F., Sangiorgi, F., van Konijnenburg-van Cittert, H., de Leeuw, J. W., Matthiessen, J., Backman, J., Moran, K., and Expedition 302 Scientists: Episodic fresh surface waters in the Eocene Arctic Ocean, Nature, 441, 606–609, https://doi.org/10.1038/nature04692, 2006.
Bordiga, M., Henderiks, J., Tori, F., Monechi, S., Fenero, R., Legarda-Lisarri, A., and Thomas, E.: Microfossil evidence for trophic changes during the Eocene–Oligocene transition in the South Atlantic (ODP Site 1263, Walvis Ridge), Clim. Past, 11, 1249–1270, https://doi.org/10.5194/cp-11-1249-2015, 2015.
Boulila, S., Dupont-Nivet, G., Galbrun, B., Bauer, H., and Châteauneuf, J.-J.: Age and driving mechanisms of the Eocene–Oligocene transition from astronomical tuning of a lacustrine record (Rennes Basin, France), Clim. Past, 17, 2343–2360, https://doi.org/10.5194/cp-17-2343-2021, 2021.
Bown, P. R.: Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project Sites 1 to 10, 2003-4), J. Nannoplankton Res., 27, 21–95, https://doi.org/10.58998/jnr2031, 2005.
Bown, P. R. and Pearson, P.: Calcareous plankton evolution and the Paleocene/Eocene thermal maximum event: New evidence from Tanzaniam, Mar. Micropaleontol., 71, 60–70, https://doi.org/10.1016/j.marmicro.2009.01.005, 2009.
Bown, P. R. and Young, J. R.: Techniques, in: Calcareous nannofossil biostratigraphy, edited by: Bown, P. R., Chapman & Hall, Cambridge, UK, 16–28, ISBN 0-412-78970-1, 1998.
Brown, R. E., Koeberl, C., Montanari, A., and Bice, D. M.: Evidence for a change in Milankovitch forcing caused by extraterrestrial events at Massignano, Italy, Eocene-Oligocene boundary GSSP, in: The Late Eocene Earth-Hothouse, Icehouse, and Impacts, edited by: Koeberl, C. and Montanari, A., Geol. Soc. Am. Bull., 452, 1–19, https://doi.org/10.1130/2009.2452(08), 2009.
Catanzariti, R., Rio, D., and Martelli, L.: Late Eocene to Oligocene calcareous nannofossil Biostratigraphy in Northern Apennines: the Ranzano sandstone, Mem. Sci. Geol., 49, 207–253, 1997.
Cattò, S., Cavazza, W., Zattin, M., and Okay, A. I.: No significant Alpine tectonic overprint on the Cimmerian Strandja Massif (SE Bulgaria and NW Turkey), Int. Geol. Rev., 60, 513–529, https://doi.org/10.1080/00206814.2017.1350604, 2018.
Catuneanu, O. (Ed.): Principles of sequence stratigraphy, Elsevier, Amsterdam, the Netherlands, 375 pp., ISBN 9780444515681, 2006.
Caves, J. K., Jost, A. B., Lau, K. V., and Maher, K.: Cenozoic carbon cycle imbalances and a variable weathering feedback, Earth Planet Sc. Lett., 450, 152–163, https://doi.org/10.1016/j.epsl.2016.06.035, 2016.
Chekar, M., Slimani, H., Jbari, H., Guédé, K. E., Mahboub, I., Asebriy, L., and Aassoumi, H.: Eocene to Oligocene dinoflagellate cysts from the Tattofte section, western External Rif, northwestern Morocco: Biostratigraphy, paleoenvironments and paleoclimate, Palaeogeogr. Palaeocl., 507, 97–114, https://doi.org/10.1016/j.palaeo.2018.07.004, 2018.
Coxall, H. K. and Pearson, P. N.: The Eocene-Oligocene transition, in: Deep Time Perspectives on Climate Change: Marrying the Signal From Computer Models and Biological Proxies, edited by: Williams, M., Haywood, A. M., Gregory, F. J., and Schmidt, D. N, The Micropalaeontological Society, Special Publications, Geological Society of London, 2, 351–387, https://doi.org/10.1144/TMS002.16, 2007.
Coxall, H. K. and Wilson, P. A.: Early Oligocene glaciation and productivity in the eastern equatorial Pacific: Insights into global carbon cycling, Paleoceanography, 26, 1–18, https://doi.org/10.1029/2010PA002021, 2011.
Coxall, H. K., Wilson, P. A., Pälike, H., Lear, C. H., and Backman, J.: Rapid stepwise onset of Antarctic glaciation and deeper calcite compensation in the Pacific Ocean, Nature, 433, 53–57, https://doi.org/10.1038/nature03135, 2005.
Coxall, H. K., Huck, C. E., Huber, M., Lear, C. H., Legarda-Lisarri, A., O'regan, M., Sliwinska, K. K., van de Flierdt, T., de Boer, A. M., Zachos, J. C., and Backman, J.: Export of nutrient rich Northern Component Water preceded early Oligocene Antarctic glaciation, Nat. Geosci., 11, 190–196, https://doi.org/10.1038/s41561-018-0069-9, 2018.
Cramwinckel, M. J., Coxall, H. K., Śliwińska, K. K., Polling, M., Harper, D. T., Bijl, P. K., Brinkhuis, H., Eldrett, J. S., Houben, A. J. P., Peterse, F., Schouten, S., Reichart, G.-J., Zachos, J. C., and Sluijs, A.: A warm, stratified, and restricted Labrador Sea across the Middle Eocene and its climatic optimum, Paleoceanogr. Paleocl., 35, 1–27, https://doi.org/10.1029/2020PA003932, 2020.
Cunha, A. S. and Shimabukuro, S.: Braarudosphaera blooms and anomalous enrichments of Nannoconus: Evidence from the Turonian South Atlantic, Santos Basin, Brazil, J. Nannoplankton Res., 19, 51–55, https://doi.org/10.58998/jnr2217, 1997.
Dall'Antonia, B., Bossio, A., and Guernet, C.: The Eocene/Oligocene boundary and the psychrospheric event in the Tethys as recorded by deep-sea ostracods from the Massignano Global Boundary Stratotype Section and Point, Central Italy, Mar. Micropaleontol., 48, 91–106, https://doi.org/10.1016/S0377-8398(02)00163-9, 2003.
Dansgaard, W.: Stable isotopes in precipitation, Tellus, 16, 436–468, https://doi.org/10.3402/tellusa.v16i4.8993, 1964.
De Kaenel, E. and Villa, G.: Oligocene-Miocene calcareous nannofossil biostratigraphy and paleoecology from the Iberia Abyssal Plain, in: Proceedings-Ocean Drilling Program Scientific Results vol. 149, edited by: Whitmarsh, R. B., Sawyer, D. S., Klaus, A., and Masson, D. G., College Station, TX, 79–146, https://doi.org/10.2973/odp.proc.sr.149.208.1996, 1996.
De Lira Mota, M. A., Dunkley Jones, T., Sulaiman, N., Edgar, K. M., Yamaguchi, T., Leng, M. J., Adloff, M., Greene, S. E., Norris, R., Warren, B., Duffy, G., Farrant, J., Murayama, M., Hall, J., and Bendle, J.: Multi-proxy evidence for sea level fall at the onset of the Eocene-Oligocene transition, Nat. Commun., 14, 4748, https://doi.org/10.1038/s41467-023-39806-6, 2023.
Dickson, A. J., Bagard, M. L., Katchinoff, J. A., Davies, M., Poulton, S. W., and Cohen, A. S.: Isotopic constraints on ocean redox at the end of the Eocene, Earth Planet Sc. Lett., 562, 116814, https://doi.org/10.1016/j.epsl.2021.116814, 2021.
Diester-Haass, L. and Zahn, R.: Eocene-Oligocene transition in the Southern Ocean: History of water mass circulation and biological productivity, Geology, 24, 163–166, https://doi.org/10.1130/0091-7613(1996)024<0163:EOTITS>2.3.CO;2, 1996.
Dohmann, L.: Die unteroligozänen Fischschiefer im Molassebecken, Dissertation, Ludwig-Maximilian-Universität, Munich, Germany, 365 pp., 1991.
Dunkley Jones, T., Bown, P. R., Pearson, P. N., Wade, B. S., Coxall, H. K., and Lear, C. H.: Major shifts in calcareous phytoplankton assemblages through the Eocene-Oligocene transition of Tanzania and their implications for low-latitude primary production, Paleoceanography, 23, 1–14, https://doi.org/10.1029/2008PA001640, 2008.
El Beialy, S. Y., Head, M. J., El Atfy, H., and El Khoriby, E. M.: Dinoflagellate cyst evidence for the age and palaeoenvironments of the Upper Eocene–Oligocene Dabaa Formation, Qattara Depression, north Western Desert, Egypt, Palynology, 43, 268–291, https://doi.org/10.1080/01916122.2018.1434696, 2019.
Eldrett, J. S., Harding, I. C., Firth, J. V., and Roberts, A. P.: Magnetostratigraphic calibration of Eocene–Oligocene dinoflagellate cyst biostratigraphy from the Norwegian–Greenland Sea, Mar. Geol., 204, 91–127, https://doi.org/10.1016/S0025-3227(03)00357-8, 2004.
Eldrett, J. S., Greenwood, D. R., Harding, I. C., and Huber, M.: Increased seasonality through the Eocene to Oligocene transition in northern high latitudes, Nature, 459, 969–973, https://doi.org/10.1038/nature08069, 2009.
Ferreira, E. P., Alves, C. F., Sanjinés, A. E. S., and Alves, M. C.: Ascidian spicules of Quaternary sediments from the lower slope of the Campos Basin (Brazil), Quatern. Int., 508, 116–124, https://doi.org/10.1016/j.quaint.2018.11.008, 2019.
Fioroni, C., Villa, G., Persico, D., and Jovane, L.: Middle Eocene-Lower Oligocene calcareous nannofossil biostratigraphy and paleoceanographic implications from Site 711 (equatorial Indian Ocean), Mar. Micropaleontol., 118, 50–62, https://doi.org/10.1016/j.marmicro.2015.06.001, 2015.
Frieling, J. and Sluijs, A.: Towards quantitative environmental reconstructions from ancient non-analogue microfossil assemblages: Ecological preferences of Paleocene–Eocene dinoflagellates, Earth-Sci. Rev., 185, 956–973, https://doi.org/10.1016/j.earscirev.2018.08.014, 2018.
Gat, J. R.: Oxygen and hydrogen isotopes in the hydrologic cycle, Annu. Rev. Earth Planet. Sc., 24, 225–262, https://doi.org/10.1146/annurev.earth.24.1.225, 1996.
Gavrilov, Y. O., Shchepetova, E. V., Shcherbinina, E. A., Golovanova, O. V., Nedumov, R. I., and Pokrovsky, B. G.: Sedimentary environments and geochemistry of Upper Eocene and Lower Oligocene rocks in the northeastern Caucasus, Lithol. Miner. Resour., 52, 447–466, https://doi.org/10.1134/S0024490217060037, 2017.
Gradstein, F. M., Ogg, J. G., Schmitz, M. D., and Ogg, G. E. (Eds.): The geologic time scale, Boston, USA, 1144 pp., ISBN 978-0-444-59425-9, 2012.
Guerreiro, C., Cachão, M., and Drago, T.: Calcareous nannoplankton as a tracer of the marine influence on the NW coast of Portugal over the last 14000 years, J. Nannoplankton Res., 27, 159–172, https://doi.org/10.58998/jnr2107, 2005.
Haidar, A. T. and Thierstein, H. R.: Coccolithophore dynamics off Bermuda (N. Atlantic), Deep-Sea Res. Pt. II, 48, 1925–1956, https://doi.org/10.1016/S0967-0645(00)00169-7, 2001.
Haq, B. U.: Biogeographic history of Miocene calcareous nannoplankton and paleoceanography of the Atlantic Ocean, Micropaleontology, 26, 414–443, https://doi.org/10.2307/1485353, 1980.
Hegewald, A. and Jokat, W.: Relative sea level variations in the Chukchi region-Arctic Ocean-since the late Eocene, Geophys. Res. Lett., 40, 803–807, https://doi.org/10.1002/grl.50182, 2013.
Hou, M., Zhuang, G., Ellwood, B. B., Liu, X. L., and Wu, M.: Enhanced precipitation in the Gulf of Mexico during the Eocene–Oligocene transition driven by interhemispherical temperature asymmetry, Geol. Soc. Am. Bull., 134, 2335–2344, https://doi.org/10.1130/B36103.1, 2022.
Houben, A. J., van Mourik, C. A., Montanari, A., Coccioni, R., and Brinkhuis, H.: The Eocene–Oligocene transition: Changes in sea level, temperature or both?, Palaeogeogr. Palaeocl., 335, 75–83, https://doi.org/10.1016/j.palaeo.2011.04.008, 2012.
Hutchinson, D. K., de Boer, A. M., Coxall, H. K., Caballero, R., Nilsson, J., and Baatsen, M.: Climate sensitivity and meridional overturning circulation in the late Eocene using GFDL CM2.1, Clim. Past, 14, 789–810, https://doi.org/10.5194/cp-14-789-2018, 2018.
Hutchinson, D. K., Coxall, H. K., O'Regan, M., Nilsson, J., Caballero, R., and de Boer, A. M.: Arctic closure as a trigger for Atlantic overturning at the Eocene-Oligocene Transition, Nat. Commun., 10, 3797, https://doi.org/10.1038/s41467-019-11828-z, 2019.
Hutchinson, D. K., Coxall, H. K., Lunt, D. J., Steinthorsdottir, M., de Boer, A. M., Baatsen, M., von der Heydt, A., Huber, M., Kennedy-Asser, A. T., Kunzmann, L., Ladant, J.-B., Lear, C. H., Moraweck, K., Pearson, P. N., Piga, E., Pound, M. J., Salzmann, U., Scher, H. D., Sijp, W. P., Śliwińska, K. K., Wilson, P. A., and Zhang, Z.: The Eocene–Oligocene transition: a review of marine and terrestrial proxy data, models and model–data comparisons, Clim. Past, 17, 269–315, https://doi.org/10.5194/cp-17-269-2021, 2021.
Hyeong, K., Kuroda, J., Seo, I., and Wilson, P. A.: Response of the Pacific inter-tropical convergence zone to global cooling and initiation of Antarctic glaciation across the Eocene Oligocene Transition, Sci. Rep., 6, 30647, https://doi.org/10.1038/srep30647, 2016.
Iakovleva, A. I.: Organic walled dinoflagellate cyst biostratigraphy of the Bartonian/Priabonian GSSP Alano di Piave section, NE Italy, Rev. Palaeobot. Palyno., 332, 105233, https://doi.org/10.1016/j.revpalbo.2024.105233, 2025.
Iakovleva, A. I., Zakrevskaya, E. Y., and Shcherbinina, E. A.: Middle Eocene to earliest Oligocene dinoflagellate cysts from southern Armenia: biostratigraphy and palaeoecology, Palynology, 48, 2343902, https://doi.org/10.1080/01916122.2024.2343902, 2024.
Jaramillo-Vogel, D., Strasser, A., Frijia, G., and Spezzaferri, S.: Neritic isotope and sedimentary records of the Eocene–Oligocene greenhouse–icehouse transition: The Calcare di Nago Formation (northern Italy) in a global context, Palaeogeogr. Palaeocl., 369, 361–376, https://doi.org/10.1016/j.palaeo.2012.11.003, 2013.
Jarsve, E. M., Eidvin, T., Nystuen, J. P., Faleide, J. I., Gabrielsen, R. H., and Thyberg, B. I.: The Oligocene succession in the eastern North Sea: basin development and depositional systems, Geol. Mag., 152, 668–693, https://doi.org/10.1017/S0016756814000570, 2015.
Jones, A. P., Dunkley Jones, T., Coxall, H., Pearson, P. N., Nala, D., and Hoggett, M.: Low-latitude calcareous nannofossil response in the Indo-Pacific warm pool across the Eocene-Oligocene transition of Java, Indonesia, Paleoceanogr. Paleocl., 34, 1833–1847, https://doi.org/10.1029/2019PA003597, 2019.
Jovane, L., Florindo, F., Sprovieri, M., and Pälike, H.: Astronomic calibration of the late Eocene/early Oligocene Massignano section (central Italy), Geochem. Geophy. Geosy., 7, 1–10, https://doi.org/10.1029/2005GC001195, 2006.
Jovane, L., Sprovieri, M., Florindo, F., Acton, G., Coccioni, R., Dall'Antonia, B., and Dinarès-Turell, J.: Eocene-Oligocene paleoceanographic changes in the stratotype section, Massignano, Italy: Clues from rock magnetism and stable isotopes, J. Geophys. Res.-Sol. Ea., 112, B11101, https://doi.org/10.1029/2007JB004963, 2007.
Katz, M. E., Miller, K. G., Wright, J. D., Wade, B. S., Browning, J. V., Cramer, B. S., and Rosenthal, Y.: Stepwise transition from the Eocene greenhouse to the Oligocene icehouse, Nat. Geosci, 1, 329–334, https://doi.org/10.1038/ngeo179, 2008.
Kim, S. L., Eberle, J. J., Bell, D. M., Fox, D. A., and Padilla, A.: Evidence from shark teeth for a brackish Arctic Ocean in the Eocene greenhouse, Geology, 42, 695–698, https://doi.org/10.1130/G35675.1, 2014.
Kocsis, L., Ozsvárt, P., Becker, D., Ziegler, R., Scherler, L., and Codrea, V.: Orogeny forced terrestrial climate variation during the late Eocene–early Oligocene in Europe, Geology, 42, 727–730, https://doi.org/10.1130/G35673.1, 2014.
Konno, S., Harada, N., Narita, H., and Jordan, R. W.: Living Braarudosphaera bigelowii (Gran & Braarud) Deflandre in the Bering Sea, J. Nannoplankton Res., 29, 78–87, https://doi.org/10.58998/jnr2152, 2007.
Langton, S. J., Rabideaux, N. M., Borrelli, C., and Katz, M. E.: Southeastern Atlantic deep-water evolution during the late-middle Eocene to earliest Oligocene (Ocean Drilling program site 1263 and Deep Sea Drilling project site 366), Geosphere, 12, 1032–1047, https://doi.org/10.1130/GES01268.1, 2016.
Less, G., Özcan, E., and Okay, A.: Stratigraphy and larger foraminifera of the Middle Eocene to Lower Oligocene shallow-marine units in the northern and eastern parts of the Thrace Basin, NW Turkey, Turk. J. Earth Sci., 20, 793–845, https://doi.org/10.3906/yer-1010-53, 2011.
Li, S., Xing, Y., Valdes, P. J., Huang, Y., Su, T., Farnsworth, A., Lunt, D. J., Tang, H., Kennedy, A. T., and Zhou, Z.: Oligocene climate signals and forcings in Eurasia revealed by plant macrofossil and modelling results, Gondwana Res., 61, 115–127, https://doi.org/10.1016/j.gr.2018.04.015, 2018.
Licht, A., Folch, A., Sylvestre, F., Yacoub, A. N., Cogné, N., Abderamane, M., Guihou, A., Kisne, N. M., Fleury, J., Rochette, P., Nké, B. E. B., Zagalo, A. H., Poujol M., and Deschamps, P.: Provenance of aeolian sands from the southeastern Sahara from a detrital zircon perspective, Quaternary Sci. Rev., 328, 108539, https://doi.org/10.1016/j.quascirev.2024.108539, 2024.
Mahboub, I., Slimani, H., Toufiq, A., Chekar, M., Djeya, K. L., Jbari, H., and Chakir, S.: Middle Eocene to early Oligocene dinoflagellate cyst biostratigraphy and paleoenvironmental interpretations of the Ben Attaya section at Taza, eastern External Rif, Morocco, J. Afr. Earth Sci., 149, 154–169, https://doi.org/10.1016/j.jafrearsci.2018.08.006, 2019.
Marchev, P., Raicheva, R., Jicha, B., Guillong, M., Ivanova, R., Bachmann, O., Spikings, R., Okay, A., and Ozsvárt, P: The large Rupelian Rhodope Massif eruptions as the source of airfall tuffs in SE, S and Central Europe: 40Ar/39Ar and U–Pb age constraints, Int. J. Earth Sci., 113, 1619–1641, https://doi.org/10.1007/s00531-024-02457-z, 2024.
Marino, M. and Flores, J. A.: Middle Eocene to early Oligocene calcareous nannofossil stratigraphy at Leg 177 Site 1090, Mar. Micropaleontol., 45, 383–398, https://doi.org/10.1016/S0377-8398(02)00036-1, 2002.
Marret, F. and De Vernal, A.: Dinoflagellate cysts as proxies of environmental, ocean and climate changes in the Atlantic realm during the quaternary, Front. Ecol. Environ., 12, 1378931, https://doi.org/10.3389/fevo.2024.1378931, 2024
Martini, E.: Standard Tertiary and Quaternary calcareous nannoplankton zonation, in: Proceedings second planktonic conference, Rome, Italy, 1970, 739–785, 1971.
Miller, K. G., Wright, J. D., and Fairbanks, R. G.: Unlocking the ice house: Oligocene-Miocene oxygen isotopes, eustasy, and margin erosion, J. Geophys. Res.-Sol. Ea., 96, 6829–6848, https://doi.org/10.1029/90JB02015, 1991.
Miller, K. G., Browning, J. V., Aubry, M. P., Wade, B. S., Katz, M. E., Kulpecz, A. A., and Wright, J. D.: Eocene–Oligocene global climate and sea-level changes: St. Stephens Quarry, Alabama, Geol. Soc. Am. Bull., 120, 34–53, https://doi.org/10.1130/B26105.1, 2008.
Miller, K. G., Browning, J. V., Schmelz, W. J., Kopp, R. E., Mountain, G. S., and Wright, J. D.: Cenozoic sea-level and cryospheric evolution from deep-sea geochemical and continental margin records, Sci. Adv., 6, eaaz1346, https://doi.org/10.1126/sciadv.aaz1346, 2020.
Monechi, S., Buccianti, A., and Gardin, S.: Biotic signals from nannoflora across the iridium anomaly in the upper Eocene of the Massignano section: evidence from statistical analysis, Mar. Micropaleontol., 39, 219–237, https://doi.org/10.1016/S0377-8398(00)00022-0, 2000.
Natal'in, B. and Say, A. G.: Eocene–Oligocene stratigraphy and structural history of the Karaburun area, southwestern Black Sea coast, Turkey: transition from extension to compression, Geol. Mag., 152, 1104–1122, https://doi.org/10.1017/S0016756815000229, 2015.
Okay, A. I. and Nikishin, A. M.: Tectonic evolution of the southern margin of Laurasia in the Black Sea region, Int. Geol. Rev., 57, 1051–1076, https://doi.org/10.1080/00206814.2015.1010609, 2015.
Okay, A. I., Özcan, E., Hakyemez, A., Siyako, M., Sunal, G., and Kylander-Clark, A. R.: The Thrace Basin and the Black Sea: the Eocene–Oligocene marine connection, Geol. Mag., 156, 39–61, https://doi.org/10.1017/S0016756817000772, 2019.
Okay, A. I., Simmons, M. D., Özcan, E., Starkie, S., Bidgood, M. D., and Kylander-Clark, A. R.: Eocene-Oligocene succession at Kıyıköy (Midye) on the Black Sea coast in Thrace, Turk. J. Earth. Sci., 29, 139–153, https://doi.org/10.3906/yer-1907-5, 2020.
O'Regan, M., Williams, C. J., Frey, K. E., and Jakobsson, M.: A synthesis of the long-term paleoclimatic evolution of the Arctic, Oceanography, 24, 66–80, https://doi.org/10.5670/oceanog.2011.57, 2011.
Ozsvárt, P., Kocsis, L., Nyerges, A., Győri, O., and Pálfy, J.: The eocene-oligocene climate transition in the central Paratethys, Palaeogeogr. Palaeocl., 459, 471–487, https://doi.org/10.1016/j.palaeo.2016.07.034, 2016.
Palcu, D. V. and Krijgsman, W.: The dire straits of Paratethys: Gateways to the anoxic giant of Eurasia, in: Straits and Seaways: Controls, Processes and Implications in Modern and Ancient Systems, edited by: Rossi, V. M., Longhitano, S. G., Olariu, C., and Chiocci, F. L., Geological Society, London, Special Publications, 523, https://doi.org/10.1144/SP523-2021-73, 2023.
Pälike, H., Norris, R. D., Herrle, J. O., Wilson, P. A., Coxall, H. K., Lear, C. H., Shackleton, N. J., Tripati, A. K., and Wade, B. S.: The heartbeat of the Oligocene climate system, Science, 314, 1894–1898, https://doi.org/10.1126/science.1133822, 2006.
Pearson, P. N., McMillan, I. K., Wade, B. S., Jones, T. D., Coxall, H. K., Bown, P. R., and Lear, C. H.: Extinction and environmental change across the Eocene-Oligocene boundary in Tanzania, Geology, 36, 179–182, https://doi.org/10.1130/G24308A.1, 2008.
Pekar, S. and Miller, K. G.: New Jersey Oligocene “Icehouse” sequences (ODP Leg 150X) correlated with global δ18O and Exxon eustatic records, Geology, 24, 567–570, https://doi.org/10.1130/0091-7613(1996)024<0567:NJOISO>2.3.CO;2, 1996.
Pekar, S. F., Christie-Blick, N., Kominz, M. A., and Miller, K. G.: Calibration between eustatic estimates from backstripping and oxygen isotopic records for the Oligocene, Geology, 30, 903–906, https://doi.org/10.1130/0091-7613(2002)030<0903:CBEEFB>2.0.CO;2, 2002.
Peleo-Alampay, A. M., Mead, G. A., and Wei, W.: Unusual Oligocene Braarudosphaera-rich layers of the South Atlantic and their palaeoceanographic implications, J. Nannoplankton Res., 21, 17–26, https://doi.org/10.58998/jnr2190, 1999.
Perch-Nielsen, K.: Cenozoic calcareous nannofossils, in: Plankton Stratigraphy, edited by: Bolli, H. M., Saunders, J. B., and Perch-Nielsen, K., Cambridge University Press, Cambridge, UK, 427–554, ISBN-10:0521235766, 1985.
Pross, J. and Brinkhuis, H.: Organic-walled dinoflagellate cysts as paleoenvironmental indicators in the Paleogene, a synopsis of concepts, Paläontol. Z., 79, 53–59, https://doi.org/10.1007/BF03021753, 2005.
Popov, S. V., Akhmetiev, M. A., Bugrova, E. M., Lopatin, A. V., Amitrov, O. V., Andreyeva-Grigorovich, A. S., Zaporozhets, N. I., Zherikhin, V. V., Krasheninnikov, V. A., Nikolaeva, I. A., Sytchevskaya, E. K., and Shcherba, I. G.: Biogeography of the Northern Peri-Tethys from the Late Eocene to the Early Miocene: Part 2. Early Oligocene, Paleontol. J., 36, 185–259, 2002.
Popov, S. V., Rozanov, A. Y., Rögl, F., Steininger, F. F., Shcherba, I. G., and Kovac, M.: Lithological-paleogeographic maps of Paratethys, CFS Courier Forschungsinstitut Senckenberg, Stuttgart, 250, 46 pp., ISBN 978-3-510-61370-0, 2004.
Popov, S. V., Antipov, M. P., Zastrozhnov, A. S., Kurina, E. E., and Pinchuk, T. N.: Sea-level fluctuations on the northern shelf of the Eastern Paratethys in the Oligocene-Neogene, Stratigr. Geol. Correl., 18, 200–224, https://doi.org/10.1134/S0869593810020073, 2010.
Raffi, I., Catelli, V., Fioroni, C., Righi, D., Villa, G., and Persico, D.: Calcareous nannofossils from the Paleogene Southern Ocean (IODP Site U1553, Campbell Plateau), Newsl. Stratigr., 57, 475–495, https://doi.org/10.1127/nos/2024/0854, 2024.
Sachsenhofer, R. F., Popov, S. V., Bechtel, A., Coric, S., Francu, J., Gratzer, R., Grunert, P., Kotarba, M., Mayer, J., Pupp, M., Rupprecht B. J., and Vincent, S. J.: Oligocene and Lower Miocene source rocks in the Paratethys: palaeogeographical and stratigraphic controls, Geological Society, London, Special Publications, 464, 267–306, https://doi.org/10.1144/SP464.1, 2018.
Salamy, K. A. and Zachos, J. C.: Latest Eocene–Early Oligocene climate change and Southern Ocean fertility: inferences from sediment accumulation and stable isotope data, Palaeogeogr. Palaeocl., 145, 61–77, https://doi.org/10.1016/S0031-0182(98)00093-5, 1999.
Sancay, R. H. and Batı, Z.: Late Eocene to Early Oligocene palynostratigraphy of the Western Black Sea, Eastern Paratethys, Turk. J. Earth Sci., 29, 115–138, https://doi.org/10.3906/yer-1905-10, 2020.
Scher, H. D., Bohaty, S. M., Zachos, J. C., and Delaney, M. L.: Two-stepping into the icehouse: East Antarctic weathering during progressive ice-sheet expansion at the Eocene–Oligocene transition, Geology, 39, 383–386, https://doi.org/10.1130/G31726.1, 2011.
Schulz, H. M., Bechtel, A., and Sachsenhofer, R. F: The birth of the Paratethys during the Early Oligocene: from Tethys to an ancient Black Sea analogue?, Global Planet. Change, 49, 163–176, https://doi.org/10.1016/j.gloplacha.2005.07.001, 2005.
Simmons, M. D., Bidgood, M. D., Connell, P. G., Coric, S., Okay, A. I., Shaw, D., Tulan, E., Mayer, J., and Tari, G. C.: Biostratigraphy and paleoenvironments of the Oligocene succession (İhsaniye Formation) at Karaburun (NW Turkey), Turk. J. Earth Sci., 29, 28–63, https://doi.org/10.3906/yer-1907-7, 2020.
Slimani, H., Mahboub, I., Toufiq, A., Jbari, H., Chakir, S., and Tahiri, A.: Bartonian to Priabonian dinoflagellate cyst biostratigraphy and paleoenvironments of the M'karcha section in the Southern Tethys margin (Rif Chain, Northern Morocco), Mar. Micropaleontol., 153, 101785, https://doi.org/10.1016/j.marmicro.2019.101785, 2019.
Slimani, H. and Chekar, M.: Dinoflagellate-based age control and biostratigraphic correlations of the Eocene and Oligocene (Lutetian–Chattian) sediments in the El Habt tectonic Unit, western External Rif Chain, Morocco (NW Africa), Newsl. Stratigr., 56, 257–305, https://doi.org/10.1127/nos/2022/0704, 2023.
Śliwińska, K. K.: Early Oligocene dinocysts as a tool for palaeoenvironment reconstruction and stratigraphical framework – a case study from a North Sea well, J. Micropalaeontol., 38, 143–176, https://doi.org/10.5194/jm-38-143-2019, 2019.
Śliwińska, K. K. and Heilmann-Clausen, C.: Early Oligocene cooling reflected by the dinoflagellate cyst Svalbardella cooksoniae, Palaeogeogr. Palaeocl., 305, 138–149, https://doi.org/10.1016/j.palaeo.2011.02.027, 2011.
Śliwińska, K. K., Thomsen, E., Schouten, S., Schoon, P. L., and Heilmann-Clausen, C.: Climate-and gateway-driven cooling of Late Eocene to earliest Oligocene sea surface temperatures in the North Sea Basin, Sci. Rep., 9, 4458, https://doi.org/10.1038/s41598-019-41013-7, 2019.
Slotnick, B. S. and Schellenberg, S. A.: Biotic response of Tethyan bathyal ostracodes through the Eocene–Oligocene Transition: The composite faunal record from the Massicore and Massignano Global Stratotype Section and Point (east central Italy), Mar. Micropaleontol., 103, 68–84, https://doi.org/10.1016/j.marmicro.2013.03.005, 2013.
Sluijs, A. and Brinkhuis, H.: High Arctic late Paleocene and early Eocene dinoflagellate cysts, J. Micropalaeontol., 43, 441–474, https://doi.org/10.5194/jm-43-441-2024, 2024.
Sluijs, A., Pross, J., and Brinkhuis, H.: From greenhouse to icehouse; organic-walled dinoflagellate cysts as paleoenvironmental indicators in the Paleogene, Earth-Sci. Rev., 68, 281–315, https://doi.org/10.1016/j.earscirev.2004.06.001, 2005.
Soták, J.: Paleoenvironmental changes across the Eocene-Oligocene boundary: insights from the Central-Carpathian Paleogene Basin, Geol. Carpath., 61, 393–418, https://doi.org/10.2478/v10096-010-0024-1, 2010.
Soutter, E. L., Kane, I. A., Martínez-Doñate, A., Boyce, A. J., Stacey, J., and Castelltort, S.: The Eocene-Oligocene climate transition in the Alpine foreland basin: Paleoenvironmental change recorded in submarine fans, Palaeogeogr. Palaeocl., 600, 111064, https://doi.org/10.1016/j.palaeo.2022.111064, 2022.
Stärz, M., Jokat, W., Knorr, G., and Lohmann, G.: Threshold in North Atlantic-Arctic Ocean circulation controlled by the subsidence of the Greenland-Scotland Ridge, Nat. Commun., 8, 15681, https://doi.org/10.1038/ncomms15681, 2017.
Stockmarr, J.: Determination of spore concentration with an electronic particle counter, Danmarks Geol. Undersøl., Raekke, 15, 87–89, https://doi.org/10.22008/gpub/38152, 1973.
Stover, L. E. and Hardenbol, J.: Dinoflagellates and depositional sequences in the lower Oligocene (Rupelian) Boom clay formation, Belgium, Bulletin de la Société belge de Géologie, 102, 5–77, 1993.
Straume, E. O., Steinberger, B., Becker, T. W., and Faccenna, C.: Impact of mantle convection and dynamic topography on the Cenozoic paleogeography of Central Eurasia and the West Siberian Seaway, Earth. Planet. Sc. Lett., 630, 118615, https://doi.org/10.1016/j.epsl.2024.118615, 2024.
Street, C. and Bown, P. R.: Palaeobiogeography of early Cretaceous (Berriasian–Barremian) calcareous nannoplankton, Mar. Micropaleontol., 39, 265–291, https://doi.org/10.1016/S0377-8398(00)00024-4, 2000.
Švábenická, L.: Braarudosphaera-rich sediments in the Turonian of the Bohemian Cretaceous Basin, Czech Republic, Cretaceous Res., 20, 773–782, https://doi.org/10.1006/cres.1999.0182, 1999.
Thierstein, H. R., Cortés, M. Y., and Haidar, A. T.: Plankton community behavior on ecological and evolutionary time-scales: when models confront evidence, in: Coccolithophores: from molecular processes to global impact, edited by: Thierstein, H. R. and Young, J. R., Springer, Berlin Heidelberg, 455–479, https://doi.org/10.1007/978-3-662-06278-4_17, 2004.
Toffanin, F., Agnini, C., Rio, D., Acton, G., and Westerhold, T.: Middle Eocene to early Oligocene calcareous nannofossil biostratigraphy at IODP Site U1333 (equatorial Pacific), Micropaleontology, 59, 69–82, http://www.jstor.org/stable/24413317, 2013.
Toledo, F. A., Cachão, M., Costa, K. B., and Pivel, M. A.: Planktonic foraminifera, calcareous nannoplankton and ascidian variations during the last 25 kyr in the Southwestern Atlantic: A paleoproductivity signature?, Mar. Micropaleontol., 64, 67–79, https://doi.org/10.1016/j.marmicro.2007.03.001, 2007.
Tulan, E., Sachsenhofer, R. F., Tari, G., Flecker, R., Fairbank, V., Pupp, M., and Ickert, R. B.: Source rock potential and depositional environment of the Lower Oligocene İhsaniyeFormation in NW Turkey (Thrace, Karaburun), Turk. J. Earth Sci., 29, 64–84, https://doi.org/10.3906/yer-1906-14, 2020.
Turgut, S.: Evolution of the Thrace sedimentary basin and its hydrocarbon prospectivity, in: Generation, accumulation, and production of Europe's hydrocarbons, edited by: Spencer, M. A., Springer Berlin, Heidelberg, 415–437, ISBN 978-3-662-07417-6, 1991.
Vahlenkamp, M., Niezgodzki, I., De Vleeschouwer, D., Lohmann, G., Bickert, T., and Pälike, H.: Ocean and climate response to North Atlantic seaway changes at the onset of long-term Eocene cooling, Earth Planet. Sc. Lett., 498, 185–195, https://doi.org/10.1016/j.epsl.2018.06.031, 2018.
van Der Boon, A., van der Ploeg, R., Cramwinckel, M. J., Kuiper, K. F., Popov, S. V., Tabachnikova, I. P., Palcu, D. V., and Krijgsman, W.: Integrated stratigraphy of the Eocene-Oligocene deposits of the northern Caucasus (Belaya River, Russia): Intermittent oxygen-depleted episodes in the Peri-Tethys and Paratethys, Palaeogeogr. Palaeocl., 536, 109395, https://doi.org/10.1016/j.palaeo.2019.109395, 2019.
Van Mourik, C. A. and Brinkhuis, H.: The Massignano Eocene-Oligocene golden spike section revisited, Stratigraphy, 2, 13–30, https://doi.org/10.29041/strat.02.1.01, 2005.
Van Simaeys, S., Brinkhuis, H., Pross, J., Williams, G. L., and Zachos, J. C.: Arctic dinoflagellate migrations mark the strongest Oligocene glaciations, Geology, 33, 709–712, https://doi.org/10.1130/G21634.1, 2005.
Varol, O.: Didemnid ascidian spicules from the Arabian Peninsula, J. Nannoplankton Res., 28, 35–55, https://doi.org/10.58998/jnr2258, 2006.
Vermeesch, P.: IsoplotR: A free and open toolbox for geochronology, Geosci. Front., 9, 1479–1493, https://doi.org/10.1016/j.gsf.2018.04.001, 2018.
Vermeesch, P.: On the treatment of discordant detrital zircon U–Pb data, Geochronology, 3, 247–257, https://doi.org/10.5194/gchron-3-247-2021, 2021.
Viganò, A., Coxall, H. K., Holmström, M., Vinco, M., Lear, C. H., and Agnini, C.: Calcareous nannofossils across the Eocene-Oligocene transition at Site 756 (Ninetyeast Ridge, Indian Ocean): implications for biostratigraphy and paleoceanographic clues, Newsl. Stratigr., 56, 187–223, https://doi.org/10.1127/nos/2022/0725, 2023a.
Viganò, A., Westerhold, T., Bown, P. R., Jones, T. D., and Agnini, C.: Calcareous nannofossils across the Eocene-Oligocene transition: Preservation signals and biostratigraphic remarks from ODP Site 1209 (NW Pacific, Shatsky Rise) and IODP Hole U1411B (NW Atlantic Ocean, Newfoundland Ridge), Palaeogeogr. Palaeocl., 629, 111778, https://doi.org/10.1016/j.palaeo.2023.111778, 2023b.
Viganò, A., Dallanave, E., Alegret, L., Westerhold, T., Sutherland, R., Dickens, G. R., Newsam, C., and Agnini, C.: Calcareous nannofossil biostratigraphy and biochronology across the Eocene-Oligocene transition: the record at IODP Site U1509 (Tasman Sea) and a global overview, Newsl. Stratigr., 57, 1–23, https://doi.org/10.1127/nos/2023/0751, 2024a.
Viganò, A., Dallanave, E., Alegret, L., Westerhold, T., Sutherland, R., Dickens, G. R., Newsam, C., and Agnini, C.: Calcareous nannofossils and paleoclimatic evolution across the Eocene-Oligocene transition at IODP Site U1509, Tasman Sea, Southwest Pacific Ocean, Paleoceanogr. Paleoclimatol., 39, e2023PA004738, https://doi.org/10.1029/2023PA004738, 2024b.
Villa, G., Fioroni, C., Pea, L., Bohaty, S., and Persico, D.: Middle Eocene–late Oligocene climate variability: calcareous nannofossil response at Kerguelen Plateau, Site 748, Mar. Micropaleontol., 69, 173–192, https://doi.org/10.1016/j.marmicro.2008.07.006, 2008.
Villa, G., Fioroni, C., Persico, D., Roberts, A. P., and Florindo, F.: Middle Eocene to late Oligocene Antarctic glaciation/deglaciation and Southern Ocean productivity, Paleoceanogr. Paleocl., 29, 223–237, https://doi.org/10.1002/2013PA002518, 2014.
Villa, G., Florindo, F., Persico, D., Lurcock, P., de Martini, A. P., Jovane, L., and Fioroni, C.: Integrated calcareous nannofossil and magnetostratigraphic record of ODP Site 709: Middle Eocene to late Oligocene paleoclimate and paleoceanography of the Equatorial Indian Ocean, Mar. Micropaleontol., 169, 102051, https://doi.org/10.1016/j.marmicro.2021.102051, 2021.
Waddell, L. M. and Moore, T. C.: Salinity of the Eocene Arctic Ocean from oxygen isotope analysis of fish bone carbonate, Paleoceanography, 23, 1–14, https://doi.org/10.1029/2007PA001451, 2008.
Wade, B. S. and Bown, P. R.: Calcareous nannofossils in extreme environments: the Messinian salinity crisis, Polemi Basin, Cyprus, Palaeogeogr. Palaeocl., 233, 271–286, https://doi.org/10.1016/j.palaeo.2005.10.007, 2006.
Wade, B. S. and Pälike, H.: Oligocene climate dynamics, Paleoceanography, 19, 1–16 https://doi.org/10.1029/2004PA001042, 2004.
Wei, W. and Wise Jr., S. W.: Biogeographic gradients of middle Eocene-Oligocene calcareous nannoplankton in the South Atlantic Ocean, Palaeogeogr. Palaeocl., 79, 29–61, https://doi.org/10.1016/0031-0182(90)90104-F, 1990.
Wei, W., Villa, G., and Wise Jr., S. W.: Paleoceanographic implications of Eocene-Oligocene calcareous nannofossils from sites 711 and 748 in the Indian Ocean, Proc. Ocean Drill. Progr. Sci. Res., 120, 979–999, https://doi.org/10.2973/odp.proc.sr.120.199.1992, 1992.
Williams, G. L., Fensome, R. A., and MacRae, R. A.: The Lentin and Williams Index of Fossil Dinoflagellate 2019 Edition, AASP Contributions Series Number, 50, 1173, ISSN 0160-8843, 2019.
Winter, A. and Siesser, W. G. (Eds).: Coccolithophores, Cambridge Univ. Press, Cambridge, 242 pp., ISBN 0-521-38050-2, 1994.
Yücel, A. O., Özcan, E., and Erbil, Ü.: Latest Priabonian larger benthic foraminiferal assemblages at the demise of theSoğucak Carbonate Platform (Thrace Basin and Black Sea shelf, NW Turkey): implications for the shallow marine biostratigraphy, Turk. J. Earth Sci., 29, 85–114, https://doi.org/10.3906/yer-1904-19, 2020.
Zachos, J. C., Quinn, T. M., and Salamy, K. A.: High-resolution (104 years) deep-sea foraminiferal stable isotope records of the Eocene-Oligocene climate transition, Paleoceanography, 11, 251–266, https://doi.org/10.1029/96PA00571, 1996.
Zachos, J., Pagani, M., Sloan, L., Thomas, E., and Billups, K.: Trends, rhythms, and aberrations in global climate 65 Ma to present, Science, 292, 686–693, https://doi.org/10.1126/science.1059412, 2001.
Ziveri, P., Baumann, K. H., Böckel, B., Bollmann, J., and Young, J. R.: Biogeography of selected Holocene coccoliths in the Atlantic Ocean, in: Coccolithophores: from molecular processes to global impact, edited by: Thierstein, H. R. and Young, J. R., Springer, Berlin Heidelberg, 403–428, https://doi.org/10.1007/978-3-662-06278-4_15, 2004.
Zonneveld, K. A., Marret, F., Versteegh, G. J., Bogus, K., Bonnet, S., Bouimetarhan, I., Crouch, E., de Vernal, A., Elshanawany, R., Edwards, L., Esper, O., Forke, S., Grøsfjeld, K., Henry, M., Holzwarth, U., Kielt, J.-F., Kim, S.-Y., Ladouceur, S., Ledu, D., Chen, L., Limoges, A., Londeix, L., Hu, S.-H., Mahmoud, M. S., Marino, G., Matsouka, K., Matthiessen, J., Mildenhal, D. C., Mudie, P., Neil, H. L., Pospelova, V., Qi, Y., Radi, T., Richerol, T., Rochon, A., Sangiorgi, F., Solignac, S., Turon, J.-L., Verleye, T., Wang, Y., Wang, Z., and Young, M.: Atlas of modern dinoflagellate cyst distribution based on 2405 data points, Rev. Palaeobot. Palyno., 191, 1–197, https://doi.org/10.1016/j.revpalbo.2012.08.003, 2013.
Short summary
The Eocene–Oligocene Transition (EOT) marked global cooling and Antarctic glaciation, but its impact on marginal seas is less known. This study analyzes the Karaburun section in the eastern Paratethys, using biostratigraphy and geochemistry to reveal boreal water ingress due to Arctic–Atlantic gateway closure. Findings highlight the interplay of global and regional climate dynamics in shaping marginal marine environments.
The Eocene–Oligocene Transition (EOT) marked global cooling and Antarctic glaciation, but its...
