Precambrian
| Precambrian | ||||||
|---|---|---|---|---|---|---|
| Chronology | ||||||
| ||||||
| Proposed subdivisions | See Proposed Precambrian timeline | |||||
| Etymology | ||||||
| Synonym(s) | Cryptozoic | |||||
| Usage information | ||||||
| Celestial body | Earth | |||||
| Regional usage | Global (ICS) | |||||
| Time scale(s) used | ICS Time Scale | |||||
| Definition | ||||||
| Chronological unit | Supereon | |||||
| Stratigraphic unit | Supereonthem | |||||
| Time span formality | Informal | |||||
| Lower boundary definition | Formation of the Earth | |||||
| Lower boundary GSSP | N/A | |||||
| GSSP ratified | N/A | |||||
| Upper boundary definition | Appearance of the Ichnofossil Treptichnus pedum | |||||
| Upper boundary GSSP | Fortune Head section, Newfoundland, Canada 47°04′34″N 55°49′52″W / 47.0762°N 55.8310°W | |||||
| GSSP ratified | 1992 | |||||
Precambrian (හෝ Pre-Cambrian, සමහර විටක කෙටිකොට දක්වන පරිදි pꞒ, හෝ Cryptozoic) යනු පෘථිවි ඉතිහාසයේ වසර මිලියන 4600-539 කට පෙර යුගය වේ.
ආශ්රිත
[සංස්කරණය]- Phanerozoic – fourth and current eonothem and eon of the geological timescale
මූලාශ්ර
[සංස්කරණය]
භාහිර සබැඳි
[සංස්කරණය]
Wikimedia Commons has media related to Precambrian.
- Late Precambrian Supercontinent and Ice House World from the Paleomap Project
