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Earth’s geographic poles have a complicated history
A Science study discussed by Phys.org on October 2, 2026, found evidence for episodes of relatively rapid true polar wander across the past 320 million years. This process involves the solid outer Earth shifting relative to the planet’s spin axis.
Sea level as an ancient witness
Changing orientation redistributes ocean water in recognizable global patterns. By reconstructing ancient sea-level signals, researchers identified episodes of more rapid motion, particularly around 150–140 million and 100–90 million years ago.
Not the same as magnetic pole reversal
True polar wander differs from changes to Earth’s magnetic field. Nor does the study predict that the planet will suddenly flip over in our lifetime. “Rapid” in geology can still mean movement unfolding across millions of years.
Apep Bar asks
What else is recorded in ancient shorelines that we have been reading as ordinary sea-level change?
References and further reading
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