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Fossils record the changes of life on earth, and are used to date rocks that were formed over the last 540 million years. This is a simplified version of the internationally-accepted time scale. Ages on the right (in millions of years) are based on radiometric dating.
A much more detailed subdivision of the time scale has been undertaken in New Zealand, and a local version is used for dating rocks.
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Te Ara - The Encyclopedia of New Zealand
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23 March 2011