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
8. Paleogene

Additional parents:

1. top of the aat hierarchies
2. Styles and Periods Facet
3. Styles and Periods
4. styles, periods, and cultures by general era
5. geologic time scale
6. Phanerozoic
7. Cenozoic
8. Tertiary

Anotations

Scope note:

On the geologic time scale, oldest of five epochs of the Tertiary period, or the last of the more recently designated Paleogene period of the Cenozoic era. The Paleocene extends from about 65 million to 55 million years ago. It followed the Cretaceous period and preceded the Eocene epoch. It is marked by the rapid proliferation and evolution of mammals, including the first primates, and by the formation of the Rocky Mountains.