Early Pliocene molluscs from the easternmost Mediterranean region (SE Turkey): biostratigraphic, ecostratigraphic, and palaeobiogeographic implications

Authors : Yeşim BÜYÜKMERİÇ, Erdoğan TEKİN, Erdal İbrahim HERECE, Koray SÖZERİ, Nihal AKCA, Baki Erdoğan VAROL

Pages : 127-151

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The mollusc faunas from Pliocene deposits of the Hatay-İskenderun region were investigated at nine localities and complemented with three localities from earlier studies. The Pliocene units were deposited in three adjacent subbasins, Hatay-Samandağ insert ignore into journalissuearticles values(HS);, Altınözü-Babatorun insert ignore into journalissuearticles values(AB);, and İskenderun-Arsuz insert ignore into journalissuearticles values(İA);; the first two are also known as the Hatay Graben. Basin configurations and shape, environmental evolution, and faunal compositions were affected by differential tectonic histories since the Late Miocene. In total 162 species insert ignore into journalissuearticles values(94 gastropod, 61 bivalve, and 7 scaphopod); are recorded, 80 of which are recorded for the first time from the region. The occurrence of tropical stenohaline benthic taxa insert ignore into journalissuearticles values(such as Persististrombus coronatus and some conid gastropod species); and a number of chronostratigraphically well-constrained mollusc species shows a Zanclean age. The base of the Early Pliocene is also shown by the occurrence of planktic foraminifer assemblages corresponding to MPL1 and MPL2 biozones and the nannoplankton Amaurolithus delicatus assemblage. The Early Pliocene Hatay molluscan assemblages allow for palaeobiogeographic comparisons across the Mediterranean. The Pliocene marine fossiliferous deposits are assigned to the Mediterranean Pliocene Molluscan Unit 1 insert ignore into journalissuearticles values(MPMU1); of the western Mediterranean and Atlantic regions. However, the eastern Mediterranean assemblages are notably poorer in species and in particular a number of thermophilic groups are lacking. This marine biodiversity gradient has been a characteristic feature of the Mediterranean ever since the Pliocene.
Keywords : Zanclean, Gastropoda, Bivalvia, Scaphopoda, stratigraphy, palaeoecology, Hatay basin