Original: In paleogeography, Laurasia was the northernmost of two supercontinents (the other being Gondwana) that formed part of the Pangaea supercontinent from approximately (Mya). It separated from Gondwana (the late Triassic era) during the breakup of Pangaea, drifting further north after the split.
Simplified: Pangaea split in the Jurassic into Laurasia and Gondwana to the south.