The Earth has had several large continental masses in the past The first was called UR around 3 billion years ago which eventually broke up. The super continent Rodinia was formed about 1.2 billion years ago and fragmented around 650 million years ago. The continents were then recombined to make Pangea about 200 million years ago until it broke up into today’s continents.

(The Great Courses – A New History of Life)