Steen River impact structure

Steen River is an impact structure in Alberta, Canada. It is 25 km (16 mi) in diameter and the age is estimated to be 91 ± 7 million years (Late Cretaceous). The structure is not exposed at the surface. The original crater was partially eroded prior to burial, and lies under 200 m (660 ft) of sediments.^[1]

Steen River impact structure
Location of the impact structure in Canada
Impact crater/structure
Confidence	Confirmed
Diameter	25 km (16 mi)
Age	91 ± 7 Ma Late Cretaceous
Exposed	No
Drilled	Yes
Location
Coordinates	59°30′N 117°38′W
Country	Canada
Province	Alberta
District	Mackenzie County