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The INQUA IFC (International Focus Group) POCAS continues a series of projects (UNESCO-IUGSIGCP 521, 610; INQUA 501 - http://avalon-institute.ca/projects/) devoted to the Environmental Change and Human Response in the Caspian-Black Sea-Mediterranean Corrıdor (CORRIDOR) during the Quaternary. The CORRIDOR is considered as a single geographic entity. The projects established an international team of multidisciplinary scientists (about 300 people from 27 countries) working in close relation bypassing linguistic/political/disciplinary boundaries, linking continents (Europe and Asia) more closely, and encouraging East-West dialogue and cooperation among researchers. The INQUA IFG 1709F POCAS was created within the INQUA SACCOM for the term 2017-2020. It is concentrated on in-depth study of Quaternary stratigraphy and geochronology in the Ponto-Caspian region. The Ponto-Caspian is defined here as a chain of intercontinental basins that encompasses the Caspian, Black, Azov seas, the Kerch Strait, the Manych Valley, and their coasts. This chain represents a unique oceanographic system of relict Paratethys basins which were repeatedly connected and isolated from each other during the Quaternary. This predetermined their environmental conditions and hydrologic regimes, and imposed specific impacts on diverse biological populations. Due to its geographical location and semi-isolation from the open ocean, this region acts as a paleoenvironmental amplifier and a sensitive recorder of climatic events, in particular glacialinterglacial cycles on the Eastern European Plain and mountains, as well as transgressive-regressive sea-level variations of the World Ocean; thus, it can be considered as a stratotype region where geological history is well recorded in a long series of marine and continental sediments to be used for the development of the Pleistocene stratigraphy and geochronology of the Northern Eurasia.