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Horn River Formation

Horn River Formation
Stratigraphic range: Middle to Late Devonian
Horn River Shale1.JPG
Drill cuttings sample seen through microscope
Type Geological formation
Sub-units Muskwa Member, Otter Park Member, Evie Member
Underlies Fort Simpson Formation
Overlies Pine Point Formation
Thickness up to 320 metres (1,050 ft)
Lithology
Primary Shale
Other Limestone
Location
Coordinates 61°44′00″N 117°45′00″W / 61.73333°N 117.75000°W / 61.73333; -117.75000 (Horn River Shale)Coordinates: 61°44′00″N 117°45′00″W / 61.73333°N 117.75000°W / 61.73333; -117.75000 (Horn River Shale)
Region  British Columbia,  Northwest Territories
Country  Canada
Type section
Named for Horn River
Named by Whittaker, 1922

The Horn River Formation (also Horn River Shale) is a stratigraphic unit of Devonian (early Givetian to late Frasnian) age in the Western Canadian Sedimentary Basin.

It is a thick sequence of marine sediments that was first described in outcrop on the banks of the Horn River, a tributary of the Mackenzie River, in the Northwest Territories (at the time District of Mackenzie) by Whittaker in 1922, and it takes its name from that river. In 1963 it was redefined in the subsurface of the Fort Nelson area of British Columbia (well Fort Nelson a-95-J/94-J-10) by F.F. Gray and J.R. Kassube. It is significant for its shale gas resources.

The Horn River Formation is composed of dark siliceous and calcareous shale, and argillaceous bitumenous limestone.

The Horn River Formation is included in the Beaverhill Lake Group. It is subdivided into the following members, from top to base:

The Horn River Formation is present in the subsurface in northeastern British Columbia and extends to Great Slave Lake in the Northwest Territories, where it outcrops. It reaches a maximum thickness of 320 metres (1,050 ft) in the subsurface of the Fort Nelson area.

The Horn River Formation is overlain by the Fort Simpson Formation and underlain by the limestones of the Lonely Bay Formation, Nahanni Formation or Pine Point Formation. It is equivalent to the Slave Point Formation. In the Northwest Territories it includes the Muskwa Formation, and the Waterways Member of the Hay River Formation. It includes the pinnacle reefs of the Horn Plateau Formation.


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