Belloy Formation

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

Belloy Formation
Stratigraphic range: Permian PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Underlies	Montney Formation, Fort St. John Group
Overlies	Rundle Group, Stoddart Group
Thickness	up to 274 metres (900 ft)[1]
Lithology
Primary	Chert
Other	Sandstone, siltstone, conglomerate, dolomite
Location
Coordinates	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

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

The Belloy Formation is composed of mixed carbonate-siliciclastic sequences of cherty dolomite 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]

Distribution

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.

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