Oldman Formation
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.
| 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 |
| 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) | |
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