Field Guide; Belt Butte and Tiger Butte
Route
Start point
Great Falls, Montana
End point
Junction, Evans-Riceville Road, Montana
Roads
U.S. 87/89, Montana 331
Total distance
103.4 miles
Geology
Summary
This field trip extends east from Great Falls across rolling glacial plains to the summit of Belt Butte, where its formation and the collapse structure adjacent to it will be discussed. In addition, the Tiger Butte laccolithic intrusion, contact metamorphic effects, associated dikes, and structure resulting from the intrusion will be examined.
Key Lithologic Features
- Kootenai Formation
- Madison Group
- Morrison Formation
- Blackleaf Formation
- Marias River Formation
- Mission Canyon Formation
- Lodgepole Formation
- Otter Formation
- Thunder Mountain laccolith
- Kibbey Formation
- Ellis Group
- Wolsey Formation
- Tiger Butte laccolith
- Meagher Formation
- Jefferson Formation
- Flathead Formation
- Big Snowy Group
- Swift Formation
Structures
Landforms
- Lick Creek Cave (Madison Group limestone)
Other Features
Reference
Berg, R.B., 1991, Field Guide; Belt Butte and Tiger Butte,
in Baker, D.W., and Berg, R.B., eds.,
Guidebook of the central Montana alkalic province: Geology, ore deposits and origin , Montana Bureau of Mines and Geology Special Publication 100, p. 163-174.
Availability
Out of print; can be photocopied for a fee. For more information, search for
this publication's record at the MBMG.
