continental drift

An ancient supercontinent has been pieced together by an international team of geologists led by John Rogers, of the University of North Carolina. The giant landmass, which they have named Columbia, would have spread across the face of the Earth more than one and a half billion years ago.

Their theory is that it fragmented into smaller pieces before reassembling into another supercontinent called Rodinia. Later on, it reformed again into a huge landmass scientists now call Pangea. The researchers base their conclusions on rocks from India, East Africa and Saudi Arabia. The specimens were collected during a joint Indian and U.S. study.
read more