# Eifelian

> first stage and age of the Middle Devonian series and epoch

**Wikidata**: [Q730523](https://www.wikidata.org/wiki/Q730523)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Eifelian)  
**Source**: https://4ort.xyz/entity/eifelian


## References

1. International Chronostratigraphic Chart 2013/01
2. [Source](https://stratigraphy.org/gssps/#devonian)
3. [Stages of the Devonian System](https://doi.org/10.18814/epiiugs/1985/v8i2/006)
4. [Source](https://gallica.bnf.fr/ark:/12148/bpt6k6342420s.texteImage)