State Symbols Game
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State Fossil
Lepidodendron?
Wrong. The State Fossil of Illinois is not the bark of the "Lepidodendron tree" (scientific name Lepidodendron spp.)
The fossilized remains of "Lepidodendron trees" (which is a type of club moss) make up about 90% of the coal found in Illinois. These fossils are about 300 million years old. Find out more about Lepidodendron in the Mazon Creek Fossils exhibit.