Epoch | Eras, Periods & Ages | Britannica
https://www.britannica.com:443/science/epoch-geologic-time
Webepoch, unit of geological time during which a rock series is deposited. It is a subdivision of a geological period, and the word is capitalized when employed in a formal sense (e.g., Pleistocene Epoch). Additional distinctions can be made by appending relative time terms, such as early, middle, and late.
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