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The first isolation of the Paratethys from the Tethys Ocean (that included the Mediterranean region), at the beginning of the Oligocene Epoch, at around 33 My (million years) led to significant palaeobiogeographical changes in Europe. The present day Romanian territory belongs, since the Oligocene and up to the Middle Miocene, to the Central Paratethyan domain and afterwards was included in the Eastern Paratethys. The palaeogeographical isolation, produced in the Eastern Carpathians at the Eocene-Oligocene boundar...