# Pennsylvanian

> second and final subperiod of the Carboniferous Period

**Wikidata**: [Q373772](https://www.wikidata.org/wiki/Q373772)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Pennsylvanian_(geology))  
**Source**: https://4ort.xyz/entity/pennsylvanian

## Summary

The Pennsylvanian is a subperiod within the geologic time scale[1]. It follows the Mississippian subperiod and precedes the Permian period. The Pennsylvanian spans approximately from 323.2 million to 298.9 million years ago.This subperiod is recognized for its distinct geological and paleontological characteristics, though specific events or features are not defined within the provided facts[1].


## References

1. [Source](https://zenodo.org/records/10659112)
2. International Chronostratigraphic Chart 2023/09
3. [Nuovo soggettario](https://thes.bncf.firenze.sbn.it/termine.php?id=21174)
4. CGMW ICS colour codes
5. Nuovo soggettario
6. Freebase Data Dumps. 2013
7. BabelNet
8. National Library of Israel
9. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)