Event

The North American continent is an amalgamation of many small crustal blocks that assembled about 1900-1800 million years ago.New paleomagnetic research by the Evans laboratory group, from four of those blocks and elsewhere around the globe, informs a tectonically holistic model of North America’s birth and subsequent incorporation into the supercontinents Nuna, Rodinia, and Pangea—each spaced in time by about 700 million years. The journey continues, speculatively, toward the eventual amalgamation of Amasia, the future supercontinent that is anticipated to rejoin the Americas with Eurasia via north-south closure of the Arctic Ocean and Caribbean seaway.