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. Precambrian

Anotations

Scope note:

The period of Earth's history that began 2.5 billion years ago and ended 542.0 million years ago, following the Archean. In this period stable continents first appeared and began to accrete, and also the first abundant fossils of living organisms, mostly bacteria and archaeans, then eukaryotic cells.