Nahanni Formation
The Nahanni Formation is a stratigraphical unit of Givetian age in the Western Canadian Sedimentary Basin. 

It takes the name from Nahanni Butte, a prominent ridge at the confluence of the South Nahanni River and Liard River, and was first described in outcrop on the south face of the mountain by C.O. Hage in 1945.

Lithology 
The Nahanni Formation is composed of dolomitic limestone.

Petroleum geology 
gas is produced from the Nahanni Formation in the Mackenzie River Valley.

Paleontology 
The Nahanni Formation contains paleofauna composed of corals, brachiopods and trilobites.

Distribution 
The Nahanni Formation reaches a maximum thickness of  at Nahanni Butte, and has typical thickness of . It occurs from the Franklin Mountains in the north to north-eastern British Columbia in the south.

Relationship to other units 
The Nahanni Formation is conformably overlain by the Fort Simpson Formation in the west and by the Horn River Formation in the east. It overlays the Headless Formation diachronically and transitionally, with younger deposits occurring in the west.

It is equivalent to the upper part of the Hume Formation in the Mackenzie River area, as well as the Lonely Bay Formation, Pine Point Formation and Little Buffalo Formation in the Great Slave Lake area. In northern Alberta it corresponds to the Keg River Formation.

References 

Geologic formations of British Columbia
Geologic formations of the Northwest Territories
Givetian Stage
Devonian southern paleotropical deposits
Devonian Northwest Territories
Devonian British Columbia
Limestone formations of Canada