The lowest unit of time on the scale, an epoch, still includes millions of years. Epochs are chronologically categorized into larger units called periods. Eras are created by combining many periods. The longest unit of geological time is an eon.
In geologic time, what is an epoch?
- Geologic epochs on Earth, which are characterized by the evidence found in rock layers, often last over three million years.
- geological time period known as an epoch during which a rock series is deposited.
- When used in a formal sense, the word is capitalized and refers to a subdivision of a geological epoch (e.g. Pleistocene Epoch).
- Epochs are often only used to divide the Paleogene, Neogene, and Quaternary periods.
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