Paleoarchean
Paleoarchean
Hierarchy: | Precambrian Archean Paleoarchean | ||||||||
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Classification: | Era (as per International Commission on Stratigraphy) | ||||||||
Top: | 3200 Ma | ||||||||
Base: | 3600 Ma | ||||||||
Preceeds: | Mesoarchean | ||||||||
Follows: | Eoarchean | ||||||||
GSSP: | Defined chronometrically | ||||||||
Fossil Record Data via PaleoBioDB Taxa Count Key First appearance Extinction First appearance and extinction Related precursors |
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First known oxygen-producing bacteria. Oldest definitive microfossils. Oldest cratons on Earth (such as the Canadian Shield and the Pilbara Craton) may have formed during this period. Rayner Orogeny in Antarctica.
Geologic Events
Event Name | Type | Age | Area |
---|---|---|---|
Great Oxygenation Event (concludes) | Major Climatic Event | ~3500 - ~850 Ma | Global |
Rayner orogeny (concludes) | Orogeny | ~3500 Ma | Antarctica |
First life (concludes) | Evolutionary event | ~4280 - ~3500 Ma | Global |
Overview of geological time
List all geological events