,
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Reconstructing supercontinents is like trying to assemble a 1,
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,000-piece jigsaw puzzle after you’ve lost a bunch of the pieces and your dog has chewed up others. Still,
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, by figuring out which puzzle pieces went where, geologists have been able to illuminate some of earth science’s most fundamental questions.
For one thing,
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, continental drift, that gradual movement of landmasses across Earth’s surface, profoundly affected life by allowing species to move into different parts of the world depending on what particular landmasses happened to be joined. (The global distribution of dinosaur fossils is dictated by how continents were assembled when those great animals roamed.)
Supercontinents can also help geologists hunting for mineral deposits — imagine discovering gold ore of a certain age in the Amazon and using it to find another gold deposit in a distant landmass that was once joined to the Amazon. More broadly,
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, shifting landmasses have reshaped the face of the planet — as they form, supercontinents push up mountains like the Appalachians,
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, and as they break apart, they create oceans like the Atlantic.
“The assembly and breakup of these continents have profoundly influenced the evolution of the whole Earth,
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,” says Johanna Salminen, a geophysicist at the University of Helsinki in Finland.
Article continues below timeline


Sources: D. Evans; J. Meert; Z.-X. Li,
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, D.A.D. Evans,

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