If an invertebrate animal has any skeletal parts they usually are external. An example is the shell that surrounds a snail. Living examples of these animals today include insects , worms, clams and starfish.
Some invertebrate fossils come from remains of the animals.
Others are only traces of the animals, such as footprints and burrows . Invertebrate fossils are found in all ages of Ohio's surface bedrock. For questions or comments, visit our contact page.