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

[2] The Three Forks Group is composed of dolomite, mudstone and bituminous shale.

For instance, the Three Forks and Bakken were combined in estimates of potential production released by the United States Geological Survey on April 30, 2013.

The estimate by the USGS projects that 7.4 billion barrels of oil can be recovered from the Bakken and Three Forks formations and 6.7 trillion cubic feet of natural gas and 530 million barrels of natural gas liquids using current technology.

[1] It is equivalent to the sum of the Wabamun Group and Exshaw Formation in Alberta.