A group of deposits representing a geostratigraphic stage within the Pleistocene series of the British Quaternary System, dating to the period betwen 120 000 and 10 000 years ago. The Devensian is interpreted as the last full glacial series within the Pleistocene, with deposits being stratified above Ipswichian interglacial deposits and below Flandrian series deposits of the Holocene. The Devensian is equated with the Weichselian glacial maximum in northwest Europe. The Alpine equivalent is the Würm (although the equivalence is not exact); the North American equivalent the Wisconsin. The later part of the Devensian embraces pollen zones I–III as defined by Godwin in 1940, and the Dryas climatic phases.