Eoarchean
's information is
Birth and death years unknown
The Eoarchean (IPA: EE-oh-ar-KEE-ən; also spelled Eoarchaean) is the first era of the Archean Eon of the geologic record. It spans 431 million years, from the end of the Hadean Eon 4031 Mya to the start of the Paleoarchean Era 3600 Mya. Some estimates place the beginnings of life on Earth in this era, while others place it earlier. Evidence of archaea and cyanobacteria date to 3500 Mya, which is s
* Calculated from Wikipedia data.
Accuracy is not guaranteed.
| Eoarchean | ||||||
|---|---|---|---|---|---|---|
| Chronology | ||||||
| ||||||
| Etymology | ||||||
| Name formality | Formal | |||||
| Alternate spelling(s) | Eoarchaean | |||||
| Usage information | ||||||
| Celestial body | Earth | |||||
| Regional usage | Global (ICS) | |||||
| Time scale(s) used | ICS Time Scale | |||||
| Definition | ||||||
| Chronological unit | Era | |||||
| Stratigraphic unit | Erathem | |||||
| Time span formality | Formal | |||||
| Lower boundary definition | Ten oldest U-Pb zircon ages | |||||
| Lower boundary GSSA | Along the Acasta River, Northwest Territories, Canada 65°10′26″N 115°33′14″W / 65.1738°N 115.5538°W | |||||
| Lower GSSA ratified | 2023 | |||||
| Upper boundary definition | Defined Chronometrically | |||||
| Upper GSSA ratified | Not formally defined | |||||
Look up "Eoarchean" on WikipediaWikipedia Categories
Loading...