- Source: Amsden Formation
The Amsden Formation is a geologic formation in Montana. It preserves fossils dating back to the Carboniferous period.
See also
List of fossiliferous stratigraphic units in Montana
Paleontology in Montana
References
Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.