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All News and Pages Related to "Winneshiek Lagerstätte"

The IGS Rock Library

Posted on June 17th, 2015

About 470 million years ago, a meteor as big as a city block hurtled through the Earth’s atmosphere and struck what is now northeastern Iowa. The enormous impact shattered the bedrock and blasted everything outward. Shallow, brackish seawater rushed into the crater, scooping up the materials that had just blown out and sweeping in marine […]

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