# Darriwilian

> second and last stage and age of the Middle Ordovician series and epoch

**Wikidata**: [Q1032866](https://www.wikidata.org/wiki/Q1032866)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Darriwilian)  
**Source**: https://4ort.xyz/entity/darriwilian


## References

1. International Chronostratigraphic Chart 2013/01
2. [Source](https://stratigraphy.org/chart)
3. [Source](https://stratigraphy.org/gssps/#ordovician)
4. Freebase Data Dumps. 2013
5. [Source](https://doi.org/10.18814/epiiugs/1997/v20i3/003)
6. [Source](https://stratigraphy.org/gssps/darriwilian)
7. [Source](https://ia801306.us.archive.org/14/items/biostor-105722/biostor-105722.pdf)