Winneshiek Shale
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GEOLOGY
Paleontology
Winneshiek Shale
An ancient impact crater became a time capsule preserving the oldest sea scorpion fossils
8 Feb 2026
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How did the Decorah impact crater contribute to the exceptional fossil preservation found in the Winneshiek Shale?
The crater heated the area, causing rapid fossilization through mineral replacement.
The crater created a sediment-trapping basin that protected delicate organisms from decay and disturbance.
The crater's volcanic activity preserved the fossils by encasing them in lava.
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