In the geological history of Earth, Rodinia was a Mesoproterozoic and Neoproterozoic supercontinent that assembled 1.26–0.90 billion years ago and broke up 750–633 million years ago. Valentine & Moore
Reconstruction of Rodinia at 900 million years ago, using modern images to illustrate where today's recognisable continents were at the time.
The Iapetus Ocean existed in the late Neoproterozoic and early Paleozoic eras of the geologic timescale. It was in the Southern Hemisphere, between the paleocontinents of Laurentia, Baltica and Avalon
Reconstruction of how the Iapetus Ocean and surrounding continents might have been arranged during the late Ediacaran period