Old Rocks
Diamond Member
I read where the pole are just about due to shift.
Yep. Over a period of thousands of years. Most of the time. However, notable exceptions.And we have never been able to see any effect of that in the geological record of life at that time.
NASA - 2012 Magnetic Pole Reversal Happens All The Geologic Time
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.