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Besa River Formation

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Type  Geological formation
Named by  F.A. Kidd, 1963
Named for  Besa River
Country  Canada
Primary  Slate
Thickness  up to 1,655 metres (5,430 ft)
Other  Sandstone, chert, limestone
Region  Western Canadian Sedimentary Basin
Overlies  Dunedin Formation, Slave Point Formation
Underlies  Rundle Group, Banff Formation

The Besa River Formation is a stratigraphical unit of Devonian age in the Western Canadian Sedimentary Basin.

Contents

It takes the name from Besa River, a tributary of the Prophet River, and was first described in outcrop near the Muskwa River, in the Muskwa Ranges by F.A. Kidd in 1963.

Lithology

The Besa River Formation is composed primarily of dark shale. Sandstone, bedded chert or limestone beds can occur at the top of the formation. The shale is slightly calcareous or siliceous and contains sponge spicules and radiolarians.

Distribution

The Besa River Formation reaches a maximum thickness of 1,655 metres (5,430 ft) in the foothills . The lower Besa River Formation is faulted and folded in the Northern Rockies. It occurs in the sub-surface in east-central British Columbia, in the folded Rocky Mountain Thrust Belt and southern Mackenzie Fold Belt.

Relationship to other units

The Besa River Formation is conformably overlain by the Prophet Formation or Banff Formation in its eastern extent, while to the west it is overlain by the Mattson Formation and Stoddart Group, and abruptly overlays the Dunedin Formation in the west of its extent in British Columbia, and the Slave Point Formation in the east. In the Northwest Territories, it rests on the Nahanni Formation in the east and the Road River Formation in the west.

Towards the south-west,it passes laterally into the Fort Simpson Formation and Exshaw Formation. To the south, it passes into the Dunedin Formation, Horn River Formation and Exshaw Formation. To the east it transforms into the calcareous Rundle Group and Stoddart Group. It is stratigraphically equivalent with the Fort Simpson Formation, as well as the Canol Formation and Earn Group.

References

Besa River Formation Wikipedia


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