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The last time that Earth's poles flipped in a major reversal was about 780,000 years ago, in what scientists call the Brunhes-Matuyama reversal. The fossil record shows no drastic changes in plant or animal life. Deep ocean sediment cores from this period also indicate no changes in glacial activity, based on the amount of oxygen isotopes in the cores. This is also proof that a polarity reversal would not affect the rotation axis of Earth, as the planet's rotation axis tilt has a significant effect on climate and glaciation and any change would be evident in the glacial record.
originally posted by: zazzafrazz
a reply to: smurfy
They have traced the loss of the Mars magnetosphere to the same era that the planet start to ' die ', i.e. loss of atmosphere to the tiny one it has now.
Or so the history channel said