Precambrian
| Precambrian | |
|---|---|
| Chronology | |
| Proposed subdivisions | SeeProposed 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 theEarth |
| Lower boundary GSSP | N/A |
| GSSP ratified | N/A |
| Upper boundary definition | Appearance of theIchnofossilTreptichnus pedum |
| Upper boundary GSSP | Fortune Head section,Newfoundland,Canada 47°04′34″N55°49′52″W/ 47.0762°N 55.8310°W |
| GSSP ratified | 1992 |
Precambrian(හෝPre-Cambrian,සමහර විටක කෙටිකොට දක්වන පරිදිpꞒ,හෝCryptozoic) යනු පෘථිවි ඉතිහාසයේ වසර මිලියන 4600-539 කට පෙර යුගය වේ.
ආශ්රිත
[සංස්කරණය]- Phanerozoic– fourth and current eon of the geological timescale
මූලාශ්ර
[සංස්කරණය]
භාහිර සබැඳි
[සංස්කරණය]
Precambrianහා සබැඳි මාධ්ය විකිමාධ්ය කොමන්ස් හි ඇත.
- Late Precambrian Supercontinent and Ice House Worldfrom the Paleomap Project
