Three Forks Group

Three Forks Group
Three Forks Group
Stratigraphic range: Famennian to Tournaisian PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geologic group
Sub-units	Bakken Formation, Lyleton Formation, Big Valley Formation, Torquay Formation
Underlies	Madison Group
Overlies	Saskatchewan Group
Thickness	35 metres (110 ft) to 80 metres (260 ft)
Lithology
Primary	Dolomite, mudstone, shale
Location
Region	Western Canadian Sedimentary Basin, Williston Basin
Country	Canada; United States
Type section
Named for	Three Forks, Montana
Named by	A.C. Peale, 1893

The Three Forks Group is a stratigraphical unit of Famennian age in the Williston Basin.

It takes the name from the city of Three Forks, Montana, and was first described in outcrop near the city by A.C. Peale in 1893 (for the Three Forks Shale).^[2]

^ Cite error: The named reference lexicon was invoked but never defined (see the help page).
^ Peale, A.C., 1893. The Paleozoic section in the vicinity of Three Forks, Montana. U.S G.S., Bull. 110, p. 9-56.

[lexicon-1] Cite error: The named reference lexicon was invoked but never defined (see the help page).

[2] Peale, A.C., 1893. The Paleozoic section in the vicinity of Three Forks, Montana. U.S G.S., Bull. 110, p. 9-56.

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