Gelasian

Gelasian
Chronology
Formerly part ofTertiary Period/System
Pliocene Epoch/Series
Etymology
Name formalityFormal
Usage information
Celestial bodyEarth
Regional usageGlobal (ICS)
Time scale(s) usedICS Time Scale
Definition
Chronological unitAge
Stratigraphic unitStage
Time span formalityFormal
Lower boundary definition
Lower boundary GSSPMonte San Nicola Section, Gela, Sicily, Italy
37°08′49″N 14°12′13″E / 37.1469°N 14.2035°E / 37.1469; 14.2035
Lower GSSP ratified1996 (as base of Gelasian)[2]
Upper boundary definitionApproximately 8 m after the end of magnetic polarity chronozone C2n (Olduvai).
Upper boundary GSSPVrica Section, Calabria, Italy
39°02′19″N 17°08′05″E / 39.0385°N 17.1348°E / 39.0385; 17.1348
Upper GSSP ratified5 December 2011 (as base of Calabrian)[3]

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.[4] It follows the Piacenzian Stage (part of the Pliocene) and is followed by the Calabrian Stage.

  1. ^ "International Chronostratigraphic Chart" (PDF). International Commission on Stratigraphy. September 2023. Retrieved December 16, 2024.
  2. ^ Rio, Domenico; R. Sprovieri; D. Castradori; E. Di Stefano (1998). "The Gelasian Stage (Upper Pliocene): A new unit of the global standard chronostratigraphic scale". Episodes. 21 (2): 82–87. doi:10.18814/epiiugs/1998/v21i2/002.
  3. ^ Cita, Maria; Gibbard, Philip; Head, Martin (September 2012). "Formal ratification of the GSSP for the base of the Calabrian Stage (second stage of the Pleistocene Series, Quaternary System)". Episodes. 35 (3): 388–397. doi:10.18814/epiiugs/2012/v35i3/001. hdl:10261/250367. Retrieved 26 December 2020.
  4. ^ "Stratigraphic Chart 2022" (PDF). International Stratigraphic Commission. February 2022. Retrieved 4 June 2022.

Gelasian

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