magnetic epoch

magnetic epoch

n
(Geological Science) geology a geologically long period of time during which the magnetic field of the earth retains the same polarity. The magnetic field may reverse during such a period for a geologically short period of time (a magnetic event)
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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