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The Gelasian is an age in the international geologic timescale or a stage in chronostratigraphy, being the earliest or lowest subdivision of the Quaternary Period/System and Pleistocene Epoch/Series. It spans from 2.58–1.80 annum, following the Piacenzian Age (from the Pliocene Epoch) and preceding the Calabrian Age.
Magnetostratigraphically, the base of the Gelasian is defined as the base of the Matuyama (C2r) chronozone (at the Gauss-Matuyama magnetostratigraphic boundary), at isotopic stage 103. Above this line, notable extinctions of the calcareous nannofossils occur: Discoaster. Similarly, the top of the Gelasian is magnetostratigraphically defined as the end of the Olduvai (C2n) chronozone, and faunally as the extinction level of the calcareous nannofossil Discoaster brouweri (base of biozone CN13). Above the Gelasian are the first occurrences of the calcareous nanofossil Gephyrocapsa, and the extinction level of the planktonic foraminifer Globigerinoides extremus. (2025). 9780521781428, Cambridge University Press. ISBN 9780521781428
During the Gelasian, the Red Crag Formation of Butley, the Newbourn Crag, the Norwich Crag Formation and the Weybourne Crag Formation (all from East Anglia, England) were deposited. The Gelasian is an equivalent of the Praetiglian and Tiglian Stages as defined in the Netherlands, which are commonly used in northwestern Europe.
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