# Ordovician

> second period of the Paleozoic Era

**Wikidata**: [Q62100](https://www.wikidata.org/wiki/Q62100)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Ordovician)  
**Source**: https://4ort.xyz/entity/ordovician


## References

1. [Source](https://zenodo.org/records/10659112)
2. International Chronostratigraphic Chart 2024/12
3. [Nuovo soggettario](https://thes.bncf.firenze.sbn.it/termine.php?id=37589)
4. CGMW ICS colour codes
5. Nuovo soggettario
6. Freebase Data Dumps. 2013
7. [Source](https://www.enciclopedia.cat/EC-GEC-0047514.xml)
8. YSO-Wikidata mapping project
9. BabelNet
10. [Source](https://encyklopedia.pwn.pl/haslo/ordowik;3951601.html)
11. [Ordovician - RationalWiki](https://rationalwiki.org/wiki/Ordovician)
12. National Library of Israel
13. KBpedia
14. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)