The 21st Show | Research reveals surprising findings about Illinois’ climate 300 million years ago | Illinois Public Media
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Tullimonstrum gregarium, the "Tully Monster," is from the marine settings of the Mazon Creek fossil localities. It's the state fossil of Illinois. A recent study from the University of Missouri finds that Illinois had a tropical climate in history.

Research reveals surprising findings about Illinois’ climate 300 million years ago

The 21st Show