# Middle Ordovician

> second series and epoch of the Ordovician system and period

**Wikidata**: [Q13389102](https://www.wikidata.org/wiki/Q13389102)  
**Source**: https://4ort.xyz/entity/middle-ordovician


## References

1. [Source](https://zenodo.org/records/10659112)
2. International Chronostratigraphic Chart 2024/12
3. CGMW ICS colour codes
4. BabelNet