All fossils are shown next to a quarter to show relative size.   INVERTEBRATES (animals without backbones) VERTEBRATES (animals with backbones) PLANTS Crinoid about 435 million years old, found in Ohio Dinosaur Eggshell about 90 million years old, found in Argentina Fern about 290 million years old, found in Pennsylvania Brachiopod about 435 million years old, found in Ohio Dolphin Teeth about 12-20 million years old, found in North Carolina Calamites about 340 million years old, found in Nova Scotia Belemnite about 72 million years old, found in New Jersey Whale Earbone about 4 million years old, found in California   Trilobite about 350-375 million years old, found in New York