# Middle Pennsylvanian

> second series and epoch of the Pennsylvanian Subsystem and Subperiod; fifth series and epoch of the Carboniferous System and Period

**Wikidata**: [Q131596837](https://www.wikidata.org/wiki/Q131596837)  
**Source**: https://4ort.xyz/entity/middle-pennsylvanian


## References

1. International Chronostratigraphic Chart 2023/09
2. CGMW ICS colour codes