Northgrippian
(Redirected from Middle Holocene)
| Northgrippian | |||||||||||||||
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| Chronology | |||||||||||||||
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| Etymology | |||||||||||||||
| Name formality | Formal | ||||||||||||||
| Name ratified | 14 June 2018[1][2] | ||||||||||||||
| 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 | 8.2 kiloyear event | ||||||||||||||
| Lower boundary GSSP | NGRIP1 ice core, Greenland 75°06′00″N 42°19′12″W / 75.1000°N 42.3200°W | ||||||||||||||
| Lower GSSP ratified | 14 June 2018[1] | ||||||||||||||
| Upper boundary definition | 4.2 kiloyear event | ||||||||||||||
| Upper boundary GSSP | Mawmluh Cave, Meghalaya, India 25°15′44″N 91°42′54″E / 25.2622°N 91.7150°E | ||||||||||||||
| Upper GSSP ratified | 14 June 2018[1] | ||||||||||||||
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In the geologic time scale, the Northgrippian is the middle one of three ages or stages of the Holocene Epoch or Series.[3][4][5][6] It was officially ratified by the International Commission on Stratigraphy in June 2018 along with the earlier Greenlandian and later Meghalayan ages/stages. The age takes its name from the North Greenland Ice Core Project (NorthGRIP).[4] The age began 8,276 BP (6326 BCE or 3854 HE), near the 8.2-kiloyear event, and goes up to the start of the Meghalayan, which began 4,200 BP (2250 BCE or 7750 HE), near the 4.2-kiloyear event.[7]
See also
[edit]References
[edit]- ^ a b c Walker, Mike; Head, Martin J.; Berkelhammer, Max; Björck, Svante; Cheng, Hai; Cwynar, Les; Fisher, David; Gkinis, Vasilios; Long, Anthony; Lowe, John; Newnham, Rewi; Rasmussen, Sune Olander; Weiss, Harvey (1 December 2018). "Formal ratification of the subdivision of the Holocene Series/ Epoch (Quaternary System/Period): two new Global Boundary Stratotype Sections and Points (GSSPs) and three new stages/subseries" (PDF). Episodes. 41 (4). Subcommission on Quaternary Stratigraphy (SQS): 213–223. doi:10.18814/epiiugs/2018/018016. Retrieved 28 August 2020. This proposal on behalf of the SQS has been approved by the International Commission on Stratigraphy (ICS) and formally ratified by the Executive Committee of the International Union of Geological Sciences (IUGS).
- ^ Head, Martin J. (17 May 2019). "Formal subdivision of the Quaternary System/Period: Present status and future directions". Quaternary International. 500: 32–51. Bibcode:2019QuInt.500...32H. doi:10.1016/j.quaint.2019.05.018. S2CID 182783922.
- ^ Cohen, K. M.; Finney, S. C.; Gibbard, P. L.; Fan, J-X. (January 2020). "International Chronostratigraphic Chart" (PDF). International Commission on Stratigraphy. Retrieved 8 January 2021.
- ^ a b International Commission on Stratigraphy. "ICS chart containing the Quaternary and Cambrian GSSPs and new stages (v 2018/07) is now released!". Retrieved 19 July 2018.
- ^ Radha-Udayakumar, Ganesh (19 July 2018). "Scientists call our era the Meghalayan Age. Here's what the world was like when it began". India Today. New Delhi: Living Media India Limited. Retrieved 3 January 2021.
- ^ "'Meghalayan Age': Latest phase in Earth's history named after Indian state, began 4,200 years ago". Scroll.in. 19 July 2018.
- ^ Amos, Jonathan (18 July 2018). "Welcome to the Meghalayan Age – a new phase in history". BBC News. Retrieved 19 July 2018.
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