Stratigraphy and depositional setting of the Proterozoic Snowy Pass Supergroup, southeastern Wyoming; record of an early Proterozoic atlantic-type cratonic margin
Stratigraphy and depositional setting of the Proterozoic Snowy Pass Supergroup, southeastern Wyoming; record of an early Proterozoic atlantic-type cratonic margin
Geological Society of America Bulletin (November 1983) 94 (11): 1257-1274
- Carbon County Wyoming
- continental margin
- controls
- cratons
- deltaic sedimentation
- dikes
- igneous activity
- intrusions
- lithostratigraphy
- marine sedimentation
- Medicine Bow Mountains
- metamorphic rocks
- metasedimentary rocks
- mineral composition
- North America
- paleocurrents
- Paleoproterozoic
- passive margins
- plate tectonics
- Precambrian
- Proterozoic
- provenance
- rifting
- Rocky Mountains
- sea-level changes
- sedimentation
- Sierra Madre Range
- sills
- stratigraphy
- structural controls
- tectonophysics
- transgression
- U. S. Rocky Mountains
- United States
- upper Precambrian
- Wyoming
- Deep Lake Group
- interplate tectonics
- Snowy Pass Supergroup
- Libby Lake Group
- Phantom Lake Suite
Metasedimentary rocks in the Medicine Bow Mountains and Sierra Madre are divided into four groups: the >3-km-thick Phantom Lake Metamorphic Suite; the >2.5-km-thick Deep Lake Group unconformably overlies the Phantom Lake Suite; the 4.5-km-thick lower Libby Creek Group; and the 3-km-thick upper Libby Creek Group. The Deep Lake, lower Libby Creek, and upper Libby Creek Groups collectively are named the Snowy Pass Supergroup. A rift setting for deposition explains the transgressional character of the sediments. Deltaic sedimentation parallels the cratonic boundary. Upper Libby Creek Group represents open marine conditions. Tholeiitic sills and alkalic dikes are related to basaltic igneous activity associated with rifting.--Modified journal abstract.
