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polarity event

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polarity event [pə′lar·əd·ē i‚vent]
(geophysics)
A period of no more than about 100,000 years when the earth's magnetic polarity was opposite to the predominant polarity of that polarity epoch.
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One of the current major objectives of research in magnetostratigraphy is to confirm the existence of the short magnetic polarity events.
From the superchron to the microchron: magnetic stratigraphy in deep ... by Gallet, Yves; Valet, Jean-Pierre / Oceanus
It is clear, however, that short polarity events (on the order of 0.
Micro-magnetic field measurements near the ocean floor by Tivey, Maurice I.; Schouten, Hans / Oceanus
 
 
 
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