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 the second epoch of the Tertiary period of the Cenozoic era, or the second of the more recently designated Paleogene. It extends from about 55 to 34 million years ago and is marked by warm climate, the proliferation of many modern groups of organisms, especially mammalian families and molluscs, and the emergence of what is now the Himalayan range.