epoch

8 ENTRIES FOUND:

epoch

Unit of geologic time during which a rock series is deposited. It is a subdivision of a geologic period. Additional distinctions can be made by adding relative time terms, such as early, middle, and late.

This entry comes from Encyclopædia Britannica Concise.
For the full entry on epoch, visit Britannica.com.

Seen & Heard

What made you look up epoch? Please tell us what you were reading, watching or discussing that led you here.