Three Possible Futures

Between Rodinia and Pangaea, there may have been one other supercontinent, which is known as Pannotia. Assuming it existed - and there's still disagreement on that point - Pannotia was something of an accidental supercontinent, created by glancing collisions between tectonic plates instead of any real couplings. The Pannotia supercontinent configuration was one born of coincidence and didn't last long, breaking up just 60 million years later and giving way to Pangaea, last of Earth's supercontinents.

[link to io9.com]