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]
| Northgrippian | |
|---|---|
| Chronology | |
| 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] |