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Formation autocad 20073/31/2024 ![]() At first, the hot, faulted edge of the continent was high and buoyant relative to the new ocean basin. The thick continental crust that made up the new east coast collapsed into a series of down-dropped fault blocks that roughly parallel today's coastline. Meanwhile, North America was slowly pushed westward away from the rift zone. The rift zone known as the mid-Atlantic ridge continued to provide the raw volcanic materials for the expanding ocean basin. The gash between the spreading continents gradually grew to form a new ocean basin, the Atlantic. Volcanic eruptions spewed ash and volcanic debris across the landscape as these severed continent-sized fragments of Pangea diverged. Rifting began as magma welled up through the weakness in the crust, creating a volcanic rift zone. They all existed as a single continent called Pangea. Pangea first began to be torn apart when a three-pronged fissure grew between Africa, South America, and North America. From about 280-230 million years ago (Late Paleozoic Era until the Late Triassic), the continent we now know as North America was continuous with Africa, South America, and Europe.
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