Brunhes-Matuyama boundary

The Brunhes-Matuyama boundary marks a significant change in Earth's magnetic field that occurred about 780,000 years ago. During this event, the Earth's magnetic poles switched places: the magnetic north became south, and vice versa. This reversal is recorded in ancient rocks, acting like a natural magnetic timestamp. Studying this boundary helps scientists understand Earth's magnetic history and the behavior of its magnetic field over time, which is important for understanding Earth's geology and protecting modern technology against magnetic disruptions.