Lake Mungo
Two excursions have been recorded in sediments from Skjonghelleren on Valderøy, Norway. The Virtual Geomagnetic Pole (VGP) of one happened at the same time as Lake Mungo which suggests the event was global rather than local. Data from lake sediments of a similar age in France having near identical magnetic field lines also support Lake Mungo being a global event. However, it has been suggested that Lake Mungo's anomalous field is the result of lightning strikes.