Belly River Group
|Belly River Formation
Stratigraphic range: Santonian to Campanian
Belly River beds exposed along the Oldman River
|Thickness||up to 1,300 metres (4,270 ft)|
|Other||Conglomerate, Coal, Bentonite|
|Named for||Belly River|
|Named by||George Mercer Dawson, 1883|
It takes the name from the Belly River, a tributary of the Oldman River in southern Alberta, and was first described in outcrop on the banks of the Oldman River (at the time considered part of the Belly River) and Bow River by George Mercer Dawson in 1883.
Dinosaur remains are among the fossils that have been recovered from the formation.
|Dinosaurs reported from the Belly River Group|
The Belly River Formation reaches a maximum thickness of 1,300 metres (4,270 ft) in its western reaches, and thins out eastward to about 350 metres (1,150 ft) in the Canadian Plains. It is found throughout southern Alberta, and as far east as eastern Saskatchewan. From south to north, it is present from the United States border to the Wapiti River region, south of the Peace River Country.
Relationship to other units
It is equivalent to the Milk River Formation and Pakowki Formation. The Belly River has group status in the Canadian Rockies foothills and is replaced by the Judith River Formation, Oldman Formation and Foremost Formation in southern Alberta.
- Lexicon of Canadian Geologic Units. "Belly River Formation". Retrieved 2009-03-01.
- Dawson, G.M., 1883. Preliminary report on the geology of the Bow and Belly river region, Northwest Territory, with special reference to the coal deposits. Geological Survey of Canada, Report of Progress for 1880-81-82, Part B.
- Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, North America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 574-588. ISBN 0-520-24209-2.
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