About 300 million years ago, Earth didn't have seven continents, but instead one massive supercontinent called Pangaea, which was surrounded by a single ocean called ... In the fossil record, identical plants, such as the extinct seed fern Glossopteris, are found on now widely disparate continents. read more
Pangea, the name of the super continent that preceded the modern topography that we now enjoy, started breaking up about 175 million years ago (mya). Pangea itself was the combination / conglomeration of previous crusts that came together some 335 mya. read more
And mountain chains that now lie on different continents, such as the Appalachians in the United States and the Atlas Mountains in Morocco, were all part of the Central Pangaea Mountains, formed through the collision of the supercontinents Gondwana and Laurussia. read more