Middle Eocene Climatic Optimum (MECO): The first record based on planktonic foraminifera and stable isotopes from SW Anatolia/Türkiye

Ibilioglu D., Köroglu F.

Stratigraphy, vol.21, no.1, pp.17-50, 2024 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 21 Issue: 1
  • Publication Date: 2024
  • Doi Number: 10.29041/strat.21.1.02
  • Journal Name: Stratigraphy
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aquatic Science & Fisheries Abstracts (ASFA), Geobase
  • Page Numbers: pp.17-50
  • Keywords: Isparta, MECO, planktonic foraminifera, stable isotope, SWAnatolia
  • Ankara University Affiliated: Yes


The Kayiköy Formation (Isparta, SW Türkiye) consisting of sandstone, claystone, and marl units contains abundant, low-moderate preserved, and diverse planktonic foraminifera assemblages. Eight planktonic foraminiferal biozones (E9-E16) were determine dencom passing the Lutetian-Priabonian stages (middle-upper Eocene) by using the biostratigraphic distributions of 17 genera and 62species of planktonic foraminifera. Stable ơ18O and ơ 13C isotope values were measured for 53 individuals belonging to Morozovelloidescrassatus, Acarinina bullbrooki, A. topilensis, A. echinata, Globigerinatheka curryi, G. index, G. subconglobata, G. mexicana, G. barri, G.euganea, Orbulinoides beckmanni, Turborotalia frontosa, T. pomeroli, Hantkeninamexicana, H. liebusi, H. dumblei, H. alabamensis, and Dentoglobigerina eotripartita. By integrating planktonic foraminiferal biostratigraphy, stable ơ18O and ơ13C isotopes, and paleotemperature analyses, the first detailed study of the Middle Eocene Climatic Optimum (MECO) record was performed in SWAnatolia/Türkiye. The overall signature of the MECO is similar to global observations but also involves some regional differences. The MECO paleotemperatures, determined to vary between ~2 °C and 5 °C, were similar to the global records, but the slight differences in valuesin the three sections are most likely due to the paleogeographic position of the studied section in Türkiye.