Meert,
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, a paleomagnetist at the University of Florida in Gainesville. In each supercontinent,
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, Laurentia,
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, Siberia and Baltica knit themselves together in roughly the same arrangement: Siberia and Baltica nestle like two opposing knobs on one end of Laurentia’s elongated blob. Meert calls these three continental fragments “strange attractors,” since they appear conjoined time after time.
It’s the outer edges of the jigsaw puzzle that change. Fragments like north China and southern Africa end up in different locations around the supercontinent core. “I call those bits the lonely wanderers,
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,” Meert says.
Getting to know Pangaea
While some puzzle-makers try to sort out the reconstructions of past supercontinents,
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, other geologists are exploring deeper questions about why big landmasses come together in the first place. And one place to look is Pangaea.
“Most people would accept what Pangaea looks like,
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,” Murphy says. “But as soon as you start asking why it formed, how it formed and what processes are involved — then all of a sudden you run into problems.”




As soon as you start asking why [Pangaea] formed,
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, how it formed and what processes are involved — then all of a sudden you run into problems.


— Brendan Murphy


Around 550 million years ago,
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, subduction zones around the edges of an ancient ocean began dragging that oceanic

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