The continents we know today originated with the ... The Devonian period (419 to 358 million years ago) brought Gondwana and Laurasia closer, contributing to the Late Devonian extinction and ...

After years of debate many lines of evidence now favor the idea that the present continents were once assembled into two great land masses: Gondwanaland in the south, Laurasia in the north ...

Laurasia, the northern half ... Mountains rose on the seafloor, pushing sea levels higher and onto the continents. All this water gave the previously hot and dry climate a humid and drippy ...