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." (possibly from the Judith River Formation)
 * Hesperornis montana
 * cf. Maiasaura
 * Tyrannosauridae indet.