Stratigraphic range: Permian
|Underlies||Montney Formation, Fort St. John Group|
|Overlies||Rundle Group, Stoddart Group|
|Thickness||up to 274 metres (900 ft)|
|Other||Sandstone, siltstone, conglomerate, dolomite|
|Region||Alberta, British Columbia|
|Named for||Belloy, Alberta|
|Named by||H.L. Halbertsma, 1959|
Lithology and Depositional Setting
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. 
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
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.
- Lexicon of Canadian Geologic Units. "Belloy Formation". Retrieved 2009-02-12.
- 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.
- Naqvi, I.H. (1972). "The Belloy Formation (Permian), Peace River Area, Northern Alberta and Northeastern British Columbia". Bulletin of Canadian Petroleum Geology. 20 (1).
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