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The South Atlantic did not open until the Cretaceous when Laurasia started to rotate clockwise and moved northward with North America to the north, and Eurasia to the south. The clockwise motion of Laurasia led much later to the closing of the Tethys Ocean and the widening of the "Sinus Borealis", which later became the Arctic Ocean .
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Pangaea's supercontinent cycle is a good example of the efficiency of using the presence or lack of these entities to record the development, tenure, and break-up of supercontinents. There is a sharp decrease in passive margins between 500 and 350 Ma during the timing of Pangaea's assembly.
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North American plate – Large tectonic plate including most of North America, Greenland and part of Siberia; Philippine Sea plate – Oceanic tectonic plate to the east of the Philippines; South American plate – Major tectonic plate which includes most of South America and a large part of the south Atlantic