Radiocarbon dating of east america lake levels


In the Southern Hemisphere and some areas of the Northern Hemisphere, such as southeastern North America, there was a slight warming.

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In the Greenland Summit ice core chronology, the Younger Dryas corresponds to Greenland Stadial 1 (GS-1).The preceding Allerød warm period (interstadial) is subdivided into three events: Greenland Interstadial-1c to 1a (GI-1c to GI-1a).Since 1916 and the onset and then the refinement of pollen analytical techniques and a steadily-growing number of pollen diagrams, palynologists have concluded that the Younger Dryas was a distinct period of vegetational change in large parts of Europe during which vegetation of a warmer climate was replaced by that of a generally-cold climate, a glacial plant succession that often contained Dryas octopetala.Paleobotanical and lithostratigraphic studies of Swedish and Danish bog and lake sites, like in the Allerød clay pit in Denmark, first recognized and described the Younger Dryas.Within the Blytt-Sernander classification of north European climatic phases, the prefix "Younger" refers to the recognition that this original "Dryas" period was preceded by a warmer stage, the Allerød oscillation, which, in turn, was preceded by the Older Dryas, around 14,000 calendar years BP.In default of radiometric dating, such complex successions of relatively brief moist intervals provide few stratigraphic markers of broad applicability.

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