Gelasian
Geologic period
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 the time between 2.58 Ma and 1.80 Ma.... Wikipedia
Epoch: Pleistocene
Occurred: 2.588 million years ago - 1.806 million years ago
Chronological unit: Age
Formerly part of: Tertiary Period/System; Pliocene Epoch/Series
Lower boundary GSSP: Monte San Nicola Section, Gela, Sicily, Italy; 37°08′49″N 14°12′13″E / 37.1469°N 14.2035°E
Lower GSSP ratified: 1996 (as base of Gelasian)
Upper boundary definition: Approximately 8 m after the end of magnetic polarity chronozone C2n (Olduvai)