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Why the dates on the geologic time scale are often changed and updated.

User Jens Peter
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Answer:

Absolute time measurements can be used to calibrate the relative time scale, producing an integrated geologic or "geochronologic" time scale. ... The overall duration and relative length of these large geologic intervals is unlikely to change much, but the precise numbers may "wiggle" a bit as a result of new data.

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Hope this helps :)

User Infero
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