There is an ancient meteorite crater in Iowa named the
Manson Structure. Evidently it is barely visible or no longer visible on
the surface. The crater is approximately 21 miles in diameter. Can you
tell me exactly where it is in Iowa?
The Manson Structure isn located in northwest Iowa and is centered at
42 deg 34.44 min N, 94 deg 33.6 min W. It is 36 km in diameter and alters
the magnetic field of the earth in its vicinity. You can find more about
it by doing a search on the Internet.
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Update: June 2012