| Prehistoric Scratchpad|
Siderian Period Web PagesEdit
- Paleoproterozoic Era - Era that saw the Great Oxygenation Event, followed by the first Snowball Earth period.
- Statherian Period (1.8-1.6 BYA) - Period that marked the beginning of the "Boring Billion" years, where oxygen levels dropped and evolution stagnated.
- Orosirian Period
- Rhyacian Period
- Siderian Period (2.5-2.3 BYA) - First period of the Proterozoic Eon. The Great Oxygenation Event and beginning of the Huronian Ice Age occurred at this time.