POSITION OF THE PALEOGENE STAGES BOUNDARIES IN THE SEDIMENTARY SECTION OF PLATFORM UKRAINE: CURRENT STATE, DETERMINATION CRITERIA

Data on the Global Stratotypes Sections and Points of the Paleogene Stages of the modern International Stratigraphic Scale, as well as the criteria for determining the boundaries of the Paleogene Stages in North-Western Europe are presented. The characteristics of the position of the stage boundaries in the sedimentary section of the platform Ukraine are given. In the Paleogene section of Southern Ukraine, the lower boundaries of the Ypresian and Priabonian were recognized by global correlation markers. According to the modern International Stratigraphic Scale, the position of the Lutetian / Bartonian and Rupelian / Chattian boundaries in the sedimentary sections of Southern and Northern Ukraine has been clarified in comparison with previous views. The position of most stage boundaries in the biostratigraphic (zonal) scheme of the Paleogene of Ukraine is more accurately determined. The criteria for identification for some of them in the section of the south and north of Ukraine are proposed. Most of the stage boundaries are represented by hiatus in the sedimentary cover of the platform Ukraine. Part of the boundaries of the Paleogene stages coincides with the boundaries of the regional stratigraphic units of Southern and Northern Ukraine, namely: – the Cretaceous / Paleogene boundary is at the base of the Belokamenskia and Pselian regional stages; – the Paleocene/Eocene boundary coincides with the boundary of the Merlian/Kanevian regional stages; – the Ypresian/Lutetian boundary coincides with the Kanevian/Buchakian regional stages; – the lower boundary of Priabonian is at the base of the Almian and Obukhovian regional stages; – the Eocene/Oligocene boundary passes on the limit of Almian/Planorbellian and Obukhovian/Mezhygorian regional stages; – the Rupelian/Chattian boundary is at the limit of the lower and upper regional substages of Kerleutian regional stage and at the limit of the lower and upper regional substages of the Berekian regional stage. The following stage boundaries are not coinciding with regional stage boundaries: – the Danian/Selandian boundary is within upper part of the Belokamenskian and Pselian regional stages; – the Selandian/Thanetian boundary is trassing in the lower part of the Kachian and Merlian regional stages; – the lower boundary of Ypresian is in the uppermost part of the Kachian regional stage; – the Ypresian/Lutetian boundary is within the Simferopolian regional stage; – the Lutetian/Bartonian boundary is in the lowest part of the Kumian regional stage and within the Kievian regional stage. Key words: International Stratigraphic Chart, Paleogene, stage, boundary, regional stage, Ukraine