The Unit S3U1 is a geological formation in Burgos, Spain whose strata date back to the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation.[1]
| Unit S3U1 | |
|---|---|
| Stratigraphic range: Late Cretaceous | |
| Type | Geological formation |
| Location | |
| Region | Burgos |
| Country |  Spain |
- ^ Weishampel et al., 2004, pp.588-593
- Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004), The Dinosauria, 2nd edition, Berkeley: University of California Press, pp. 1–880, ISBN 0-520-24209-2, retrieved 2019-02-21