Before Pangaea — What? — Science News, September 30, 1972
The continents as we know them resulted when the protocontinent Pangaea broke apart and its fragments made the long slow journey to their present positions. The process took about 200 million years. But the Earth’s crust is an estimated 4.5 billion years old.… [Scientists are exploring] the perplexing problem of what went on during the billions of years before Pangaea went to pieces.
The continents have an on-again, off-again relationship that has existed since well before Pangaea, fossil and rock evidence shows. Most scientists agree that the earliest known supercontinent, called Nuna, formed around
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