 Gauss–Matuyama reversal

The Gauss–Matuyama reversal refers to a significant geomagnetic reversal that occurred approximately 2.58 million years ago, marking the transition from the Gauss Chron (the recent geomagnetic polarity interval) to the Matuyama Chron (the next geomagnetic polarity interval). This reversal is one of the key events in Earth's magnetic history and is used as a reference point in the geological time scale.