Era
Eoarchean
The Eoarchean was the earliest geological era of the Archean Eon, spanning from 4.0 to 3.6 bill…
Archean
2 min
Reference
Encyclopedia
A growing reference on specimens, minerals and the divisions of deep time — written and maintained by the site's admins.
6 entries
Era
Mesoarchean
The Mesoarchean was the third era of the Archean Eon, spanning 3.2 to 2.8 billion years ago, wh…
Archean
2 min
Era
Neoarchean
The final era of the Archean Eon, marked by the widespread growth of microbial life, the format…
Archean
3 min
Era
Paleoarchean
The Paleoarchean Era lasted from approximately 3.6 to 3.2 billion years ago and represents the …
Archean
2 min
Era
Rhyacian
The second era of the Proterozoic Eon, marked by the Great Oxidation Event, widespread continen…
Proterozoic
3 min
Era
Siderian
The first era of the Proterozoic Eon, marked by the beginning of Earth's atmospheric oxygenatio…
Proterozoic
3 min