Nahanni Formation

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

Nahanni Formation
Stratigraphic range: Givetian
TypeGeological formation
UnderliesFort Simpson Formation
Horn River Formation
OverliesHeadless Formation
Thicknessup to 137 metres (450 ft)[1]
Lithology
PrimaryLimestone
Location
Coordinates61°03′0″N 123°37′0″W
RegionWCSB
Country Canada
Type section
Named forNahanni Butte
Named byC.O. Hage
Year defined1945

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.[2]

Lithology

The Nahanni Formation is composed of dolomitic limestone. [1]

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 137 metres (450 ft) at Nahanni Butte, and has typical thickness of 60 metres (200 ft). It occurs from the Franklin Mountains in the north to north-eastern British Columbia in the south.[1]

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.[1]

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

  1. Lexicon of Canadian Geologic Units. "Formation". Retrieved 2010-02-01.
  2. Hage, C.O., 1945. Geological reconnaissance along the lower Liard River, British Columbia, Yukon and Northwest Territories. Geol. Surv. Can., Paper 45-22.
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