Fossils of Mazon Creek

Fossils of Mazon Creek

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These fossils each showcase creatures that lived in Illinois during the Carboniferous period. What do you think these creatures looked like when they were alive?


Annularia Fossils

What kind of specimen do you think is pictured in this fossil? Does it remind you of any specimens you have seen in your surroundings? Click on the blue icon at the bottom right to learn more about this fossil and the others in this slideshow.