Abstract
The Upper Eocene – Lower Oligocene sections in Primorsky Krai were analyzed to select the most promising one for marking the Eocene-Oligocene boundary. The boundary between the Khasan and Fatashi formations in the Cenozoic complex of the Khasan depression was proposed to be its stratotype. Zircon radioisotope data confirm the age of the formations derived from paleobotanical data. The age of the lower strata of the Khasan Formation is 38 million years in the stratotype (Posyet Peninsula) and 37 million years in the hypostratotype (northern part of the depression). The age of the Fatashin Formation base is constrained by the Kraskino flora with its floral complex of the narrow stratigraphic range. Equivalents of this fossil flora are known in adjacent and remote areas. According to the radioisotope data, the age of the corresponding deposits matches the interval of 31.4–33.6 Ma.
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