# Rhuddanian

> first stage and age of the Llandovery series and epoch and of the Silurian system and period

**Wikidata**: [Q260369](https://www.wikidata.org/wiki/Q260369)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Rhuddanian)  
**Source**: https://4ort.xyz/entity/rhuddanian


## References

1. International Chronostratigraphic Chart 2013/01
2. [A Dictionary of Geology and Earth Sciences](https://www.oxfordreference.com/display/10.1093/acref/9780198839033.001.0001/acref-9780198839033-e-1521)
3. [Source](https://stratigraphy.org/chart)
4. [Source](https://stratigraphy.org/gssps/rhuddanian)