The poles are a herald of change. Southwest Archaeomagnetic Reference Curve. This is useful when studying early fossil hominids, but is not useful when studying modern human beings. Notice the cycle of Kosmon begins in when the Little Ice Age comes to an end, warm period marks the dawn of dan of a new cycle new day. 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.