Ur (supercontinent)

UR was a supercontinent, on the Earth, that formed 3.1 billion years ago in the early Archaean eon (during the Mesoarchaean era). It might have been the oldest continent on Earth, half a billion years older than Arctica. However, one other supercontinent, Vaalbara, may have come before Ur. Vaalbara might have formed about 3.6 billion years ago.^[1]

Ur joined with the continents Nena and Atlantica about 1 billion years ago to form the supercontinent Rodinia. Ur had survived as a single unit, until it was separated when the supercontinent Pangaea broke apart into Laurasia and Gondwana.^[2]

1. ↑ Lerner & Lerner 2003
2. ↑ Zubritsky 1997