What was Pangea?

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The jigsaw-puzzle fit of continents bordering the Atlantic Ocean is a feature noted by scientists since the seventeenth century. Alfred Wegener called this supercontinent Pangaea and cited as additional evidence the similarity of geologic features on opposite sides of the Atlantic. The matchup of ancient crystalline rocks is shown by orange in adjacent regions of South America and Africa and of North America and Europe. (Geographic fit from data of E.C. Bullard; geological data from P. M. Hurley.)

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