# Permian-Triassic mass extinction

> mass extinction event at the end of the Permian Period approximately 250 million years ago

**Wikidata**: [Q141118](https://www.wikidata.org/wiki/Q141118)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Permian–Triassic_extinction_event)  
**Source**: https://4ort.xyz/entity/permian-triassic-mass-extinction


## References

1. [Source](http://id.loc.gov/authorities/subjects/sh2020001106)
2. [Source](http://stratigraphy.org/ICSchart/ChronostratChart2018-08.pdf)
3. Freebase Data Dumps. 2013
4. Synchrony and causal relations between permian-triassic boundary crises and siberian flood volcanism
5. [Source](https://www.britannica.com/science/Permian-extinction)
6. BBC Things
7. National Library of Israel Names and Subjects Authority File
8. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)