For the Rainbow area of Alberta, it is proposed that the Middle Devonian Keg River Formation be divided into the Lower Keg River Member, the Upper Keg River Member, and the Rainbow Member, in ascending order. The overlying Middle Devonian Muskeg Formation is divided into a lower, Black Creek Member, and an upper unnamed member. The Rainbow Member is named for biohermal reefs, 756 feet thick in the discovery well. Oil and gas are produced from the Rainbow Member of the Keg River and the upper member of the Muskeg, and gas was encountered in three other zones, one of which is noncommercial, in this well.

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