#3120: Geologic Periods

XKCD comic, described below.
Transcript
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(Sourced from explainxkcd.com)

Title text:Geologists claim it's because the earlier Cenozoic used to be called the Tertiary, but that's just a ruse to hide the secret third geologic period, between the Neogene and the Quaternary, that they won't tell us about.


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