Big Snowy Group
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The Big Snowy Group is a stratigraphical unit of Chesterian age in the Williston Basin.
It takes the name from Big Snowy Mountains in Montana, and was first described on the north slopes of the mountain by H.W. Smith in 1935.
Lithology
Subdivisions
The Big Snowy Group is composed of three subdivisions, from top to base:[1]
- Heath Formation: black shale with sandstone lenses.
- Otter Formation: limestone and grey to green shale
- Kibbey Formation: shaly sandstone
Distribution
The Big Snowy Group reaches a maximum thickness of Script error: No such module "convert". in the Williston Basin.[1] It is exposed in outcrop in the Big Snowy Mountains, Little Belt Mountains, Castle Mountains and Lombard Hills of central Montana. It occurs in the sub-surface throughout the central part of the Williston Basin and into a limited area of south-central Saskatchewan.
Relationship to other units
The Big Snowy Group is unconformably overlain by the Tyler Formation in Montana, and by the Watrous Formation in Saskatchewan; It disconformably overlays the Madison Group.[1]
References
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- Pages with script errors
- Geologic groups of Montana
- Geologic groups of Saskatchewan
- Western Canadian Sedimentary Basin
- Carboniferous Montana
- Carboniferous Saskatchewan
- Carboniferous System of North America
- Shale groups of the United States
- Limestone groups of the United States
- Sandstone groups of the United States