This diagram shows the Georgetown terrane, in green, joining Australia around 1.6 billion years ago during the formation of the supercontinent Nuna. Credit: Geology, https://doi.org/10.1130/G39980.

Back When Australia Was Part of North America


Long-time readers of this blog understand that the continental plates are in a very, very slow dance around a earth-sized, spherical skating rink. They collide, separate, collide, and separate again in a supercontinent cycle that’s been going on for perhaps 3 billion years. Collisions among the continental plates create supercontinents; the supercontinents rift apart. The…