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Earth's Poles May Have Wandered

sciencenow.sciencemag.org — Earth's geographic poles may seem like immovable fixtures, but new evidence suggests that they weren't always where they are now. The findings support an old but controversial theory known as "true polar wander" that states that the poles moved as part of a planetary balancing act millions of years ago.

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  • SweetChuck, on 10/12/2007, -0/+1I'm not sure this proves that the spin axis has reoriented itself.

    "As the mineral grains were deposited or excreted by microbes, they aligned themselves with Earth's magnetic field. So they act as frozen compasses pointing to an ancient north pole."

    The magnetic pole is not the same thing as the spin axis. These minerals aligned themselves with the magnetic pole only, and we already have tons of data indicating that the magnetic pole moves around. For instance we know that there was a pole reversal around 780,000 years ago.

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