FREQUENCY DISTRIBUTION OF C-14 AGES FOR CHRONOSTRATIGRAPHIC RECONSTRUCTIONS: ALASKA REGION STUDY CASE

In this study, we test the possibility of using databases of radiocarbon ages to estimate boundaries of climatic chronozones. The Alaska region was chosen and compared with chronozones of 2 European countries: Poland and the Netherlands. The study included setting up a database of C-14 ages published for climatic records from Alaska. Some 974 C-14 determinations on organic samples were selected and used to establish chronozones for the Late Glacial and the Holocene for the Alaska region. The selected data were calibrated and a summed probability density function (PDF) was calculated. The shape analysis of the constructed frequency distribution of 14C dates on calendar timescales together with the assumption about preferential sampling seems to be a useful tool for establishing calendar ages for boundaries of climatic periods, i.e. chronozones.