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Palaeoclimatic and palaeoenvironmental interpretations are reconstructed from the sedimentary sequences of the Late Oligocene and Miocene–Pliocene boundary in the Çankırı-Çorum Basin based on evidence obtained from palynofloras and ostracod and mammal faunas. Information on the main role of mixed mesophytic and broad-leaved evergreen forests was obtained from the Late Oligocene data from the Güvendik...