Rock unit

Bayangobi

3 dinosaur genera in Omnisaura with fossils from the Bayangobi, oldest first. See all rock units.

PsittacosaurusOsborn 1923
Bones161.5–66 million years ago
AlxasaurusRussell and Dong 1994
Bones121.4–113.2 million years ago
BannykusXu et al. 2018
Bones121.4–113.2 million years ago