Oldman Formation

Oldman Formation
Stratigraphic range: Campanian, 77.5–76.5 Ma
TypeGeological formation
Unit ofBelly River Group
UnderliesDinosaur Park Formation
OverliesForemost Formation
Thicknessup to 328 feet (100 m)[1]
Lithology
PrimarySandstone
OtherMudstone and bentonite
Location
Coordinates49°37′41″N 112°53′23″W / 49.62806°N 112.88972°W / 49.62806; -112.88972 (Oldman Formation)
RegionWestern Canada Sedimentary Basin
Country Canada
Type section
Named forOldman River
Named byRussell, L.S. and Landes, R.W.
Year defined1940[2]
Oldman Formation is located in Canada
Oldman Formation
Oldman Formation (Canada)
Oldman Formation is located in Alberta
Oldman Formation
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]

  1. ^ Lexicon of Canadian Geological Units. "Oldman Formation". Archived from the original on 2013-02-22. Retrieved 2009-02-06.
  2. ^ Russell, L.S. and Landes, R.W., 1940. Geology of the southern Alberta Plains; Geological Survey of Canada, Memoir 221.
  3. ^ 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.