Archaeomagnetic dating

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The rocks formed during a period belong to a stratigraphic unit called a system.

The twelve currently recognised periods of the present eon – the Phanerozoic – are defined by the International Commission on Stratigraphy (ICS) by reference to the stratigraphy at particular locations around the world.

You may find it useful for the clear definitions, and for excellent links on a variety of topic.

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