What prehistoric creature, unique to Illinois coal reefs, is the official state fossil of Illinois?
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The Tully monster (Tullimonstrum gregarium) was a soft-bodied marine animal that lived about 300 million years ago. Its bizarre anatomy, featuring eyes on stalks and a long snout with a claw, has puzzled paleontologists for decades. It is so unique that its fossils have only been found in the Mazon Creek fossil beds of Illinois. Photo: Ghedoghedo, Wikimedia Commons, CC BY-SA 3.0.
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Source: Wikipedia (CC BY-SA)
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