# Archean

> second eon of the geologic timescale, spanning from around 4.031 to 2.5 billion years ago

**Wikidata**: [Q104168](https://www.wikidata.org/wiki/Q104168)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Archean)  
**Source**: https://4ort.xyz/entity/archean


## References

1. International Chronostratigraphic Chart 2024/12
2. International Chronostratigraphic Chart 2023/09
3. Integrated Authority File
4. [Nuovo soggettario](https://thes.bncf.firenze.sbn.it/termine.php?id=31782)
5. [Source](https://stratigraphy.org/ICSchart/CGMW_ICS_colour_codes.xlsx)
6. Nuovo soggettario
7. Freebase Data Dumps. 2013
8. BabelNet
9. National Library of Israel
10. KBpedia
11. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)