List of fossiliferous stratigraphic units in Montana

This article contains a list of fossil-bearing stratigraphic units in the state of Montana, U.S.

Sites

Group or Formation	Period	Notes
Alan Mountain Limestone	Carboniferous
Amsden Formation	Carboniferous
Arikaree Formation	Neogene
Bear Formation	Paleogene
Bearpaw Formation	Cretaceous
Bearpaw Shale	Cretaceous
Benton Shale	Cretaceous
Big Snowy Formation	Carboniferous
Big Snowy Group/Heath Formation	Carboniferous
Blackleaf Formation	Cretaceous
Blacktail Deer Creek Formation	Cretaceous
Cameron Creek Formation	Carboniferous
Castle Reef Dolomite	Carboniferous
Claggett Formation	Cretaceous
Claggett Shale	Cretaceous
Climbing Arrow Formation	Paleogene
Cloverly Formation	Cretaceous
Cody Shale	Cretaceous
Colorado Group/Belle Fourche Formation	Cretaceous
Cook Ranch Formation	Paleogene
Deadwood Formation	Ordovician, Cambrian
Dearborne Limestone	Cambrian
Deep River Formation	Neogene
Dell Beds Formation	Paleogene
Dinwoody Formation	Triassic
Dunbar Creek Formation	Paleogene
Eagle Formation	Cretaceous
Ellis Formation	Jurassic
Flaxville Gravels Formation	Neogene
Fort Union Formation	Paleogene, Cretaceous
Fort Union No. 3 Beds (Melville) Formation	Paleogene
Fort Union Group/Tullock Formation	Paleogene
Fox Hills Sandstone	Cretaceous
Graneros Shale	Cretaceous
Greyson Shale	Precambrian
Hell Creek Formation	Paleogene, Cretaceous
Hepburn's Mesa Formation	Neogene
Horsethief Formation	Cretaceous
Jefferson Formation	Devonian
Judith River Formation	Cretaceous
Kishenehn Formation	Paleogene
Kootenai Formation	Cretaceous
Lance Formation	Cretaceous
Lebo Formation	Paleogene
Livingston Formation	Paleogene
Lodgepole Limestone	Carboniferous
Ludlow Formation	Paleogene
Madison Group/Lodgepole and Mission Canyon Formation	Mississippian
Madison Valley Formation	Neogene
Madison Valley Equivalent Formation	Neogene
Madison Group/Allan Mountain Limestone	Carboniferous
Madison Group/Lodgepole Formation	Carboniferous
Madison Group/Lodgepole Limestone	Carboniferous
Marias River Shale	Cretaceous
Meagher Formation	Cambrian
Melville Formation	Paleogene
Montana Formation	Cretaceous
Montana Group/Eagle Sandstone	Cretaceous
Montana Group/Hell Creek Formation	Cretaceous
Montana Group/Judith River Formation	Cretaceous
Montana Group/Two Medicine Formation	Cretaceous
Morrison Formation	Jurassic
Mowry Shale	Cretaceous
Otter Formation	Carboniferous
Pagoda Formation	Cambrian
Park City Formation	Permian
Passamari Formation	Paleogene
Passamari Formation	Paleogene
Pentagon Formation	Cambrian
Phosphoria Formation	Permian
Pierre Shale	Cretaceous
Pilgrim Formation	Cambrian
Polecat Bench Formation	Paleogene
Renova Formation	Paleogene
Ruby River Basin Group/Renova Formation	Paleogene
Sage Creek Formation	Paleogene
Sappington Formation	Carboniferous, Devonian
Sawtooth Formation	Jurassic
Shedhorn Formation	Permian
Shedhorn Sandstone	Permian
Shell Creek Shale	Cretaceous
Sixmile Creek Formation	Neogene
Snowy Range Formation	Cambrian
St. Mary River Formation	Cretaceous
Telegraph Creek Formation	Cretaceous
Thaynes Formation	Triassic
Thermopolis Shale	Cretaceous
Three Forks Formation	Devonian
Three Forks Shale	Devonian
Tongue River Formation	Paleogene
Toston Formation	Paleogene
Tullock Formation	Paleogene
Two Medicine Formation	Cretaceous
Upper Hell Creek Formation	Cretaceous
Virgelle Sandstone	Cretaceous
White River Formation	Paleogene
Willow Creek Formation	Cretaceous
Wiota Gravels	Quaternary[1]
Wolsey Formation	Cambrian
Wolsey Shale	Cambrian

See also

• Paleontology portal

• Paleontology in Montana