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Earth's Ediacaran Period, which lasted from about 630 to 540 million years ago, has long been one of the most confusing intervals for scientists studying the planet's magnetic past.
In most other eras, Earth behaved in predictable ways. Tectonic plates moved at steady rates, climate patterns were relatively stable, and the magnetic field shifted gently around the north and south poles (while occasionally reversing direction).
The Ediacaran stands out as...
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