Paleoterraforming

Paleoterraforming is the action of terraforming a planet to resemble Earth in its past. Three planets have been fully paleoformed: Paleoterra, Ascelpius and the most famous of the three, Lazarus.

Paleoterra is a large hot world that has had the late Silurian ecosystem introduced to it.

Ascelpius is not actually a planet, but a moon of Coronis. It is the most recent world to be paleoterraformed. It now resembles almost exactly Earth's Carboniferous time period.

Lazarus was the first world to be paleoterraformed, and the most famous of the three. The time period it was paleoterraformed to was the late Jurassic, and, perhaps due to peoples' obsession with dinosaurs is the most heavily populated of the three.