In the geologic time scale, the Northgrippian is the middle of the three ages of the Holocene epoch which lies in the Quaternary period. It was officially ratified by the International Commission on Stratigraphy in July 2018 along with the Greenlandian and the Meghalayan.
|Subdivisions of the Quaternary System|
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|↑ Prehistory (Pleistocene epoch)|
The age began 8,236 years prior to the year 2000 (6236 BCE or 3764 HE), near the 8.2 kiloyear event, and goes up to the start of the Meghalayan, which began 4,200 years prior to the year 1950 (2250 BCE or 7750 HE), near the 4.2 kiloyear event.
- Cohen, K. M.; Finney, S. C.; Gibbard, P. L.; Fan, J.-X. (May 2019). "International Chronostratigraphic Chart" (PDF). International Commission on Stratigraphy. Retrieved 13 November 2019.
- Mike Walker; et al. (December 2018). "Formal ratification of the subdivision of the Holocene Series/Epoch (Quaternary System/Period)" (PDF). Episodes. Subcommission on Quaternary Stratigraphy (SQS). 41 (4): 213–223. doi:10.18814/epiiugs/2018/018016. Retrieved 11 November 2019. 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).
- Cohen, Kim Mikkel, David A. T. Harper, Philip Leonard Gibbard, and Junxuan Fan. "The ICS International Chronostratigraphic Chart". International Commission on Stratigraphy. Retrieved 19 July 2018.
- 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.
- Amos, Jonathan (18 July 2018). "Welcome to the Meghalayan Age - a new phase in history". BBC News. Retrieved 19 July 2018.