Abstract
Introduction
Previous work
Acknowledgments
Geography
General stratigraphic features
Precambrian Belt Supergroup
Spokane and Empire Formations
Helena Dolomite
Snowslip Formation
Shepard Formation
Mount Shields Formation
Red sandstone member
Red siltstone member
Bonner Quartzite
McNamara Formation
Precambrian-Cambrian unconformity
Paleozoic rocks
Cambrian
Flathead Sandstone
Gordon Shale
Damnation Limestone
Pagoda Limestone
Steamboat Limestone
Switchback Shale
Devils Glen Dolomite
Cambrian-Devonian unconformity
Devonian
Maywood Formation
Lower member
Upper member
Jefferson Formation
Lower member
Birdbear Member
Three Forks Formation
Devonian-Mississippian boundary
Mississippian
Madison Group
Allan Mountain Limestone
Lower member
Middle member
Upper member
Castle Reef Dolomite
Lower member
Sun River Member
Mississippian-Jurassic unconformity
Mesozoic rocks
Jurassic
Ellis Group
Sawtooth Formation
Sandstone member
Shale member
Siltstone member
Rierdon Formation
Swift Formation
Shale member
Sandstone member
Morrison Formation
Eastern facies
Western facies
Jurassic-Cretaceous unconformity
Cretaceous
Kootenai Formation
Colorado Group
Blackleaf Formation
Flood Shale Member
Taft Hill Member
Vaughn Member
Marias River Shale
Floweree Shale Member
Cone Calcareous Member
Ferdig Shale Member
Kevin Shale Member
Montana Group
Telegraph Creek Formation
Lower member
Middle member
Upper member
Virgelle Sandstone
Two Medicine Formation
Igneous rocks
Sills of late Precambrian age
Sills of very Late Cretaceous or early Tertiary age
Measured sections
References cited
Index.