Özlem YILMAZ, Talip GÜNGÖR, Mine Sezgül KAYSERİ-ÖZER, Funda AKGÜN, Serdar MAYDA, Tanju KAYA, Atike NAZİK, Yeşim BÜYÜKMERİÇ

Stratigraphy of the Mio-Pleistocene sequence in the Göktepe region based on the fossil record (Muğla, SW Turkey)

The sedimentary basins in SW Turkey (e.g., Kale-Tavas, Yatağan, and Ören basins) that developed after the closure of the Neotethys Ocean allow the reconstruction of the tectonic and paleogeographic history of the region. Due to the rich coal reserves, the Yatağan Basin provides a substantial amount of data to infer the paleoenvironment and paleoclimate during the middle Miocene to Pleistocene. Our work provides new paleontological and radiometric data to constrain the age, paleoclimate, and depositional environment of terrestrial deposits of this basin. We present fossil findings such as mammal bones, gastropods, and palynomorph assemblages from the base of the Turgut Formation. According to these fossils, the formation started to deposit in a brackish-freshwater lacustrine environment during the late early Miocene?early middle Miocene interval (MN4-5) under warm, subtropical climatic conditions. The brackish conditions may be explained by a marine transgression in the region. The palynological and paleontological analyses from the lignite and underlying and overlying stratigraphy in the Turgut Formation mark a freshwater environment and warmtemperate climatic conditions during the middle?late middle Miocene (MN6-7). 230Th/U dating results of the uppermost levels of the lacustrine carbonates of the Milet Formation reveal a minimum radiometric age of 346 ± 19 ka BP (middle Pleistocene). The uppermost levels of the Milet Formation overlapped the Göktepe Fault. This may imply continuous subsidence in the basin until ~346 ka.

Keywords:

Kale-Tavas Basin, Yatağan Basin, palynology, mammals, ostracods,

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