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Cambrian
The Cambrian is a major division of the geologic timescale that begins about 542 Ma (million years ago) at the end of the Proterozoic eon and ended about 488.3 Ma with the beginning of the Ordovician period (ICS, 2004).
Note: The above text is excerpted from the Wikipedia article "Cambrian", which has been released under the GNU Free Documentation License.
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