Oldman Formation

Oldman Formation
Oldman Formation
Stratigraphic range: Campanian,
Type	Geological formation
Unit of	Belly River Group
Underlies	Dinosaur Park Formation
Overlies	Foremost Formation
Thickness	up to 328 feet (100 m)
Lithology
Primary	Sandstone
Other	Mudstone and bentonite
Location
Coordinates	49°37′41″N 112°53′23″W / 49.62806°N 112.88972°W
Region	Western Canada Sedimentary Basin
Country	Canada
Type section
Named for	Oldman River
Named by	Russell, L.S. and Landes, R.W.
Year defined	1940
	Oldman Formation (Canada) Oldman Formation (Alberta)

The Oldman Formation is a stratigraphic unit of Late Cretaceous (Campanian stage) age that underlies much of southern Alberta, Canada. It consists primarily of sandstones that were deposited in fluvial channel and floodplain environments. It was named for exposures along the Oldman River between its confluence with the St. Mary River and the city of Lethbridge, and it is known primarily for its dinosaur remains and other fossils.^[3]

^ Lexicon of Canadian Geological Units. "Oldman Formation". Archived from the original on 2013-02-22. Retrieved 2009-02-06.
^ Russell, L.S. and Landes, R.W., 1940. Geology of the southern Alberta Plains; Geological Survey of Canada, Memoir 221.
^ Eberth, D.A. and Hamblin A.P. 1993. Tectonic, stratigraphic, and sedimentologic significance of a regional discontinuity in the upper Judith River Group (Belly River wedge) of southern Alberta, Saskatchewan, and northern Montana. Canadian Journal of Earth Sciences 30: 174-200.