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Years Before Present: 4.6 Billion 1.4 Billion 435 Million 275 Million 160 Million 70 Million 26 Million 11,550 |
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- 500-435 Million Years Before Present (Ordovician Period):
- Mountains build in what becomes eastern North America, but most of the continents are still flat. Shallow seas cover much of the globe. The first fossils of primitive vertabrates are laid down, alongside those of early cephalopods. By this time the elder things have spread their great land cities through much of what is to become Africa and South America, with outposts as far away as Great Britain.
- 485 Million YBP:
- The minds of the great race of Yith travel across time and space to inhabit the bodies of the cone-shaped beings of pre-Australia. The Yithians begin a war of subjugation against the polyps, which are surprised, quickly defeated, and sealed away in subterranean vaults. The Yithians build guard cities atop them.
- 450 Million YBP:
- the planet's crust has formed a major continent each in the northern and in the southern hemispheres. Africa's Sahara desert is at the South Pole, ice-covered. The two continents slowly move toward each other.
