# GSSP for the base of Tremadocian

> global boundary stratotype section and point for the base of the Tremadocian Stage, of the Lower Ordovician Series and of the Ordovician System

**Wikidata**: [Q134880783](https://www.wikidata.org/wiki/Q134880783)  
**Source**: https://4ort.xyz/entity/gssp-for-the-base-of-tremadocian


## References

1. [Source](https://stratigraphy.org/gssps/tremadocian)
2. [Source](https://stratigraphy.org/gssps/#ordovician)
3. [Source](https://doi.org/10.18814/epiiugs/2001/v24i1/005)