Allerød A late glacial (i.e. late Devensian) period marking a prolonged warmer oscillation or interstadial during the general phase of ice retreat in northwestern Europe. Radiocarbon dating suggests it lasted from about 12 000 years BP to 10800 years BP. Pollen records (pollen zone) for the north-western European area indicate a cool temperate flora with birch (Betula species) widespread, in marked contrast to the preceding and following, colder, Dryas, phases.

Allerød A period during the last glacial that marks a prolonged warmer oscillation or interstadial during the general phase of ice retreat in north-western Europe. Radiocarbon dating suggests it lasted from about 12000bp to 10800bp. Pollen records for the north-west European area indicate a cool temperate flora with birch (Betula species) widespread, in marked contrast to the preceding and following, colder, Dryas phases. In Britain the Allerød is not usually distinguished from the Bølling.

Allerød Late glacial (i.e. late Devensian) period marking a prolonged warmer oscillation or interstadial during the general phase of ice retreat in NW Europe. Radiocarbon dating suggests it lasted from about 12 000 BP to 10 800 BP. Pollen records for the NW European area indicate a cool temperate flora with birch (Betula species) widespread, in marked contrast to the preceding and following, colder, Dryas, phases.