Polarity epoch definitions

Polarity Epoch

An interval of time between reversals of Earth's magnetic field.
Found on http://www.encyclo.co.uk/local/22392

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Polarity epoch

A relatively long period of time during which the earth's magnetic field is oriented in either the normal direction or the reverse direction.
Found on http://www.evcforum.net/WebPages/Glossary_Geology.html

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