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]