See Also: epoch(medicine)
epoch(dictionary)
epoch(encyclopedia)
New Epoch(tourism)
epoch(dictionary)
Eocene Epoch(encyclopedia)
genesee epoch(medicine)
epoch-making(dictionary)
medina epoch(medicine)
epoch (as used in expressions)(encyclopedia)

epoch (sh)




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. The use of the term is usually restricted to divisions of the Tertiary and Quaternary periods.