The Brunhes-Matuyama transition marks a significant event in Earth's magnetic history, occurring approximately 780,000 years ago. During this period, the planet's magnetic field reversed, meaning that the magnetic north and south poles switched places. This phenomenon is known as geomagnetic reversal and is recorded in the geological layers of rocks. The transition is named after two scientists: Bernard Brunhes, who discovered the reversal in 1906, and Fumio Matuyama, who studied the magnetic properties of sediments in the early 20th century. The Brunhes-Matuyama boundary is crucial for understanding Earth's magnetic field changes and is used as a reference point in geological dating.