Belloy Formation

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Belloy Formation
Stratigraphic range: Permian
Type Geological formation
Underlies Montney Formation, Fort St. John Group
Overlies Rundle Group, Stoddart Group
Thickness up to 274 metres (900 ft)[1]
Primary Chert
Other Sandstone, siltstone, conglomerate, dolomite
Coordinates 55°45′37″N 118°02′55″W / 55.7604°N 118.0487°W / 55.7604; -118.0487 (Imperial Belloy 12-14-78-1W6M)Coordinates: 55°45′37″N 118°02′55″W / 55.7604°N 118.0487°W / 55.7604; -118.0487 (Imperial Belloy 12-14-78-1W6M)
Region  Alberta,  British Columbia
Country  Canada
Type section
Named for Belloy, Alberta
Named by H.L. Halbertsma, 1959

The Belloy Formation is a stratigraphical unit of Permian age in the Western Canadian Sedimentary Basin.

It takes the name from the hamlet of Belloy, Alberta, and was first described in the Imperial Belloy 12-14-78-1W6M well by H.L. Halbertsma in 1959.[2]

Lithology and Depositional Setting[edit]

The Belloy Formation is composed of mixed carbonate-siliciclastic sequences of cherty dolostone and sandstone, glauconitic and quartz sandstones, phosphorite, siltstones and conglomerate with phosphatic chert pebbles. The Belloy was deposited along a northwest-trending, tidally-influenced, west-prograding shoreline. [3]


The Belloy Formation reaches a maximum thickness of 274 metres (900 ft) in the Canadian Rockies foothills south of Fort St. John. It thins out towards the east and occurs in the sub-surface throughout the Peace River Country.

Relationship to other units[edit]

The Belloy Formation is disconformably overlain by Triassic or younger beds (Montney Formation, Fort St. John Group). It is unconformably overlies Mississippian sediments such as those of the Rundle Group.

The Bellow Formation is homotaxial with the Belcourt Formation and Kindle Formation of the Rocky Mountains.


  1. ^ Lexicon of Canadian Geologic Units. "Belloy Formation". Retrieved 2009-02-12. 
  2. ^ Halbertsma, Henk Leendert, 1959. Nomenclature of Upper Carboniferous and Permian strata in the subsurface of the Peace River area; Canadian Society of Petroleum Geologists, Journal of the Alberta Society of Petroleum Geologists, vol. 7, no. 5 (May), pp.109-118.
  3. ^ Naqvi, I.H. (1972). "The Belloy Formation (Permian), Peace River Area, Northern Alberta and Northeastern British Columbia". Bulletin of Canadian Petroleum Geology. 20 (1).