Manson impact structure
74 million year old impact structure in Iowa / From Wikipedia, the free encyclopedia
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Main article: Iowa geology
The Manson impact structure is an impact structure near the site of Manson, Iowa where an asteroid or comet nucleus struck the Earth during the Cretaceous Period, approximately 74 Ma.[1] It was one of the largest known impact events to have happened in North America.[2] Previously it was thought to have led to the extinction of the dinosaurs until isotopic ages proved that it was too old.[3]
Quick Facts Impact crater/structure, Confidence ...
Manson impact structure | |
---|---|
Impact crater/structure | |
Confidence | Confirmed |
Diameter | 35 km (22 mi) |
Age | 73.8 ± 0.3 Ma Late Cretaceous |
Exposed | No |
Drilled | Yes |
Bolide type | Chondrite |
Location | |
Coordinates | 42°35′N 94°33′W |
Country | United States |
State | Iowa |
Municipality | Manson |
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