Siderian Period

2500 Ma to 2300 Ma (2,300,000,000) 2.3 Billion Years ago

The Siderian Period ( /saɪˈdɪəriən/; Greek: σίδηρος, translit. sídēros, meaning "iron") is the first geologic period in the Paleoproterozoic Era and lasted from 2500 Ma to 2300 Ma (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically. The laying down of the banded iron formations (BIFs) peaked early in this period. BIFs were formed as anaerobic algae produced waste oxygen that combined with iron, forming magnetite (Fe3O4, an iron oxide). This process removed iron from the Earth's oceans, presumably turning greenish seas clear. Eventually, with no remaining iron in the oceans to serve as an oxygen sink, the process allowed the buildup of an oxygen-rich atmosphere. This second, follow-on event is known as the oxygen catastrophe, which, some geologists believe triggered the Huronian glaciation.

It is believed the Yotenen gain sentience around this period. The species that develops into the Yellow Segment of the UNI gains sentience. (Guihah, the) The Nul are reduced to a few tribes and lost all achievements. Back to stone age conditions. The Klack reach TL 3 for the first time. Vanuur the nebula gains sentience. The Truly Ancients vanish It is generally believed that this is the period where the first Tomradi gain sentience The Seeders destroy the Early The Seraph or surviors of the Seraph visit Earth. A battle between a Seraph and a Knight of Light occurs. (Note : the Light Knights and the Lords of Light are distinct different groups led by different entities) Knight of Light slays the Seraph and thus becomes the first Light Killer. The species that eventually develops into the Red Segment gains sentience. (Seeded by the Seeders)