Gelasian

Gelasian
Gelasian
Chronology
←	Holocene
	Subdivision of the Quaternary according to the ICS, as of 2021. ; Vertical axis scale: millions of years ago.;
Formerly part of	Tertiary Period/System; Pliocene Epoch/Series
Etymology
Name formality	Formal
Usage information
Celestial body	Earth
Regional usage	Global (ICS)
Time scale(s) used	ICS Time Scale
Definition
Chronological unit	Age
Stratigraphic unit	Stage
Time span formality	Formal
Lower boundary definition	Base of magnetic polarity chronozone C2r (Matuyama); Extinction of the Haptophytes Discoaster pentaradiatus and Discoaster surculus;
Lower boundary GSSP	Monte San Nicola Section, Gela, Sicily, Italy; 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).
Upper boundary GSSP	Vrica Section, Calabria, Italy; 39.0385°N 17.1348°E
Upper GSSP ratified	5 December 2011 (as base of Calabrian)

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 (million years ago) and 1.80 Ma. It follows the Piacenzian Stage (part of the Pliocene) and is followed by the Calabrian Stage.

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