Paleohistoric Age (地曠期, Chikōki)
The Paleohistoric Age spans the formation of the world of Erthas through to the beginning of the Prehistoric Age, ending approximately 10,000 years before the First Age (0 FA). This immense expanse of time covers the planet's formation, the emergence of life, continental drift, the evolution of complex organisms, and the eventual rise of the ancestors of modern peoples.
This article serves as a portal to the major Eras of the Paleohistoric Age.
Era
- 4 Gya – 330 Mya: Formation of the planet; early atmosphere, oceans, and the origin of life; first multicellular organisms and ecosystems begin to take hold.
- 330 – 300 Mya (Pan-Erthaic Era): Supercontinent Pan-Erthas is fully assembled; tropical and swampy lowlands dominate; giant arthropods, dense coal forests, and early amniotes thrive.
- 300 – 240 Mya (Shijin Era): Pan-Erthas begins to rift and fragment; gymnosperms expand; early synapsids and diapsids rise to ecological dominance.
- 240 – 180 Mya (Gogyō Era : Distinct continental landmasses form; early dinosaurs and marine reptiles proliferate; climate belts begin to regionalize.
- 180 – 120 Mya (Chishi Era): Full rise of dinosaurs; first true mammals and birds emerge; flowering plants absent, but conifers rule the land.
- 120 – 90 Mya (Seika Era: Placental mammals evolve on Archaeo-Bomi; continents approach modern shapes; faunal provinces begin to specialize.
- 90 – 60 Mya (Kasei Era): Afrotheres, Xenarthrans, and Laurasiatheres evolve across split continents; stable ecosystems form after mass extinction.
- 60 – 30 Mya (Reimei Era): Mammals radiate into dominant terrestrial forms; semi-sapient species evolve; oceans cool; polar zones expand.
- 30 – 0 Mya: Glaciation cycles shape land and sea; Homo species evolve and spread; major biocultural groups emerge across Erthas.