Precambrian
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Precambrian (හෝ Pre-Cambrian, සමහර විටක කෙටිකොට දක්වන පරිදි pꞒ, හෝ Cryptozoic) යනු පෘථිවි ඉතිහාසයේ වසර මිලියන 4600-539 කට පෙර යුගය වේ.
Quick Facts Chronology, Proposed subdivisions ...
Precambrian | ||||||
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~4600 – 538.8 ± 0.2 Ma | ||||||
Chronology | ||||||
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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 47.0762°N 55.8310°W / 47.0762; -55.8310 | |||||
GSSP ratified | 1992 |
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