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An excursion of the geomagnetic field characterized by strongly abnormal directions associated with a field intensity as low as 7 μT has been identified in a lava flow sequence from La Palma, Canary Islands. The age of 602+/-12 ka obtained by K/Ar dating, using the Cassignol technique, for a transitional flow represents our best estimate for the age of the occurrence of this episode of excursional...
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