# Surprise Canyon Formation

> geologic formation in Arizona, United States

**Wikidata**: [Q7646582](https://www.wikidata.org/wiki/Q7646582)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Surprise_Canyon_Formation)  
**Source**: https://4ort.xyz/entity/surprise-canyon-formation


## References

1. The Surprise Canyon Formation–An Upper Mississippian and Lower Pennsylvanian(?) rock unit in the Grand Canyon, Arizona
2. [Geologic Field Photograph Map of the Grand Canyon Region, 1967–2010](https://pubs.usgs.gov/gip/0189/gip189.pdf)