The Beaver Mines Formation is a stratigraphic unit of Early Cretaceous (Albian) age in the Western Canada Sedimentary Basin[2] that is present in southwestern Alberta and southeastern British Columbia, Canada.

[4] The Beaver Mines Formation was deposited in floodplain and fluvial channel environments by meandering river systems.

[5] It contains a variety of plant fossils including remains of ferns, cycads, cycadeoids, Ginkgos and extinct conifers, but remains of flowering plants do not appear until the overlying Ma Butte Formation.

[3][6] The Beaver Mines Formation is present in the southern foothills of southwestern Alberta and southeastern British Columbia and extends as far north as the Clearwater River where it grades into the Gates Formation of the Luscar Group.

[7] It reaches a maximum thickness of about 455 m (1,490 ft) at Ma Butte north of the Crowsnest Pass.