Steen River crater
From Infogalactic: the planetary knowledge core
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 (Lower Cretaceous). The crater is not exposed at the surface. The crater was partially eroded prior to burial, and lies under 200 m (660 ft) of sediments.[1]
References
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External links
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