Based upon the study of lava flows of basalt throughout the world, it has been proposed that the Earth's magnetic field reverses at intervals, ranging from tens of thousands to many millions of years, with an average interval of approximately 300,000 years. [15] However, the last such event, called the Brunhes–Matuyama reversal, is observed to have occurred some 780,000 years ago. There is no clear theory as to how the geomagnetic reversals might have occurred
Based upon the study of lava flows of basalt throughout the world, it has been proposed that the Earth's magnetic field reverses at intervals, ranging from tens of thousands to many millions of years, with an average interval of approximately 300,000 years. [15] However, the last such event, called the Brunhes–Matuyama reversal, is observed to have occurred some 780,000 years ago. There is no clear theory as to how the geomagnetic reversals might have occurred
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