Claggett Shale
The Claggett Shale is a geological formation in Montana whose strata date back to the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation.
Vertebrate paleofauna
Hesperornis altus? - "Tibiotarsus and vertebra." Hesperornis montana- cf. Maiasaura
- Tyrannosauridae indet.