| Decorah crater | |
|---|---|
 Location of Decorah crater on bedrock map of Iowa | |
| Impact crater/structure | |
| Confidence | Potential[1] |
| Diameter | 3.5 mi (5.6 km) |
| Age | ~470 Ma Middle Ordovician |
| Exposed | No |
| Drilled | No |
| Bolide type | Ordovician meteor event? |
| Location | |
| Coordinates | 43°18′50″N 91°46′20″W / 43.31389°N 91.77222°W |
| Country | United States |
| State | Iowa |
| District | Winneshiek |
| Municipality | Decorah |
  Location of the crater in the United States | |
The Decorah crater, also called the Decorah impact structure, is a possible impact crater located on the east side of the city of Decorah in Iowa, United States. It is thought to have been caused by a meteor about 200 metres (660 ft) wide which struck during the Middle Ordovician Period, circa 470 million years ago.
- ^ Mikheeva, Anna (2017), The Complete Catalog of the Earth's Impact structures, Russian Academy of Sciences, p. 1, retrieved 2017-10-14