Three Ancient Ecosystems Dating To 300 Million Years Ago Unearthed Beneath IllinoisModern-day Chicago is known for its gusty winds and unapologetically chunky pizza, but 300 million years ago, the region was a lush land of tropical swamps, river deltas, and shallow seas. This abundance of extinct plant life and animal life is incredibly well-preserved at the Mazon Creek fossil site – a treasure...
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