Yesterday, roaming around in the Driftless Area, we spent a few hours in Decorah, Iowa. We loved the little town, home of Luther College, and hiked up to Dunning's Spring:
Somehow, we got to talking about the meteorite — "as big as a city block" — that hit right here 470 million years ago. There's a 4-mile-wide crater underneath Decorah, and "it is filled by an unusual shale that formed after an ancient seaway sluiced into the crater, depositing sediment and an array of bizarre sea creatures that hardened into fossils." The most interesting of these creatures is Pentecopterus decorahensis:
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