# Hadean

> first eon of the geological timescale, beginning with the formation of the Earth about 4.567 billion years ago

**Wikidata**: [Q104460](https://www.wikidata.org/wiki/Q104460)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Hadean)  
**Source**: https://4ort.xyz/entity/hadean


## References

1. International Chronostratigraphic Chart 2024/12
2. [Source](https://stratigraphy.org/ICSchart/CGMW_ICS_colour_codes.xlsx)
3. Freebase Data Dumps. 2013
4. YSO-Wikidata mapping project
5. BabelNet
6. Quora
7. KBpedia
8. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)