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It's National Fossil Day

To celebrate National Fossil Day let's learn about our state fossil - the Tully Monster!

  • The Tully Monster was a soft-bodied animal that lived about 300 million years ago.
  • At that time Illinois was closer to the equator and covered with dense marshes and a shallow sea.
  • Scientists think the Tully Monster swam around and hunted for food, like shrimp and jellyfish.
  • Tullimonstrum gregarium fossils have only been found in the Mazon Creek area in Illinois.
  • Soft-bodied animals decay quickly and don't usually fossilize, but these animals must have been quickly buried slowing the decompostion process

Learn more about our state fossil here.

Particpate in National Fossil Day events and activities here.