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හේඩියානු යුගය (ඉංග්රීසි: Hadean) යනු වසර බිලියන 4.6 කට පමණ පෙර පෘථිවිය සෑදීමෙන් ආරම්භ වූ භූ විද්යාත්මක කාලයේ පළමු යුගය වේ.
Hadean | ||||||
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![]() Artist's impression of a Hadean landscape. | ||||||
Chronology | ||||||
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Proposed subdivisions | See text | |||||
Etymology | ||||||
Synonym(s) | Priscoan Period Harland et al., 1989 | |||||
Usage information | ||||||
Celestial body | Earth | |||||
Regional usage | Global (ICS) | |||||
Definition | ||||||
Chronological unit | Eon | |||||
Stratigraphic unit | Eonothem | |||||
First proposed by | Preston Cloud, 1972 | |||||
Time span formality | Informal | |||||
Lower boundary definition | Formation of the Earth | |||||
Lower boundary GSSP | N/A | |||||
GSSP ratified | N/A | |||||
Upper boundary definition | Defined Chronometrically | |||||
Upper boundary GSSP | N/A | |||||
GSSP ratified | N/A |
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