Magnetic Field

There has been news that an ancient Kauri has been discovered in New Zealand. It was preserved in a bog and it was 42,000 years old. The rings of the trunk had captured the time when the earth flipped its magnetic field. Scientists say that it was a very tumultuous period. Large mammals and Neanderthals vanished from the earth. It is now learnt that the earth is slowly shifting its magnetic field and the position of the poles are shifting, albeit slowly. When that happens will the magnetic poles of onion also flip?