Hierarchy classification:

1. top of the aat hierarchies
2. Styles and Periods Facet
3. Styles and Periods (hierarchy name)
4. [styles, periods, and cultures by general era]
5. geologic time scale
6. Phanerozoic
7. Cenozoic

Narrower term/s

• Paleocene [NP]
• Eocene [NP]
• Oligocene [NP]
• Miocene [NP]
• Pliocene [NP]

Anotations

Scope note:

First period of the Cenozoic, comprising the major portion of the era. It extends from 65.8 million to 2.6 million years ago. The Tertiary is subdivided into five epochs: Paleocene, Eocene, Oligocene, Miocene, and Pliocene. Some authorities, chiefly European, have lately replaced the Tertiary with two new time divisions: Paleogene (comprising the earlier three epochs of the period) and Neogene (covering the final two).