The Keg River Formation is a stratigraphic unit of Givetian age in the Western Canada Sedimentary Basin.

The Keg River Formation is composed of dark dolomite with intercrystalline or vuggy porosity and wackestone limestone.

[1] The Rainbow Member and upper Keg River Member are reef formations deposited in the Rainbow, Zama and Bitscho sub-basins.

The Keg River Formation occurs in the subsurface from northeastern to northwestern Alberta and its southern border is defined by the Peace River Arch.

Oil is produced from the Keg River reefs in the Zama Lake and Rainbow Lake areas of north-western Alberta.