This category is for any website dealing with the fossils or paleontology of Illinois.
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- About the Mazon Creek Fossils and Deposits Information on the abundant fossils found in the Francis Creek Shale, with images of exhibits at the Illinois State Museum.
- Illinois State Fossil: Tully Monster Information on Tullimonstrum gregarium, a soft-bodied animal preserved as outlines and flattened forms in nodules of ironstone from several areas in Illinois.