Steen River impact structure

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 / 59.500°N 117.633°W / 59.500; -117.633 (Steen River crater)
Country	Canada
Province	Alberta
District	Mackenzie County

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]

• Exploration of the Steen River impact structure

• Niccoli, M., Hildebrand, A.R. and Lawton D.C. (2005) "Seismic Velocity Study of the Rim Uplift of the Steen River Impact Crater" Lunar and Planetary Science XXXVI.