Gelasian

Source: Wikipedia, the free encyclopedia.
Gelasian
2.58 – 1.80 Ma
↓
Chronology

The Gelasian is an

Ma (million years ago) and 1.80 Ma.[5] It follows the Piacenzian Stage (part of the Pliocene) and is followed by the Calabrian
Stage.

Definition

The Gelasian was introduced in the geologic timescale in 1998.[6] It is named after the Sicilian city of Gela in the south of the island. In 2009 it was moved from the Pliocene to the Pleistocene so that the geologic time scale would be more consistent with the key changes in Earth's climate, oceans, and biota that occurred 2.58 million years ago.[7]

The base of the Gelasian is defined

Gauss-Matuyama magnetostratigraphic boundary), isotopic stage 103. Above this line notable extinctions of the calcareous nannofossils occur: Discoaster pentaradiatus and Discoaster surculus.[8][6] The GSSP
for the Gelasian is located at the Monte Sant Nicola near Gela.

The top of the Gelasian is defined magnetostratigraphically as the end of the Olduvai (C2n) chronozone, and faunally as the extinction level of the calcareous nannofossil Discoaster brouweri (base of

foraminifer Globigerinoides extremus[9][6]

Climate

During the Gelasian the ice sheets in the

marine isotope stages
(MIS 103 – MIS 64) during the age. Thus, there have probably been about 20 glacial cycles of varying intensity during the Gelasian.

Europe

In the regional glacial history of the

Tegelen in Northern Europe.[10]

During the Gelasian, the

Praetiglian and Tiglian Stages as defined in the Netherlands
, which are commonly used in northwestern Europe.

References

Notes

  1. ^ Cohen, K. M.; Finney, S. C.; Gibbard, P. L.; Fan, J.-X. (January 2020). "International Chronostratigraphic Chart" (PDF). International Commission on Stratigraphy. Retrieved 23 February 2020.
  2. doi:10.18814/epiiugs/2018/018016
    . Retrieved 11 November 2019.
  3. doi:10.18814/epiiugs/1998/v21i2/002
    .
  4. hdl:10261/250367
    . Retrieved 26 December 2020.
  5. ^ "Stratigraphic Chart 2022" (PDF). International Stratigraphic Commission. February 2022. Retrieved 4 June 2022.
  6. ^ a b c Rio, D., Sprovieri, R., Castradori, D., Di Stefano, E. "The Gelasian Stage (Upper Pliocene): A new unit of the global standard chronostratigraphic scale", Episodes, Vol. 21, No. 1, March 1998. pp 82-87. Retrieved March 18, 2020.
  7. doi:10.1002/jqs.1338
  8. ^ Gradstein et al. (2005), p. 28
  9. ^ Gradstein et al. (2005)
  10. ^ German Stratigraphic Commission: Stratigraphische Tabelle von Deutschland 2016

Literature

Retrieved from "https://en.wikipedia.org/w/index.php?title=Gelasian&oldid=1193605404"