When we find very old shark's teeth such as these, we think that sharks must have lived a very long time ago. Sharks had sharp teeth to catch and eat other fish. Fossil Ray Teeth from a desert in central New Mexico. These fossil Ray teeth were with the fossil shark teeth. They are also about 55,000,000 years old.
Rays are a kind of fish that lives in the ocean and looks like a kite with a tail.
Rays had blunt, strong teeth to scoop up the shells living on the bottom of the ocean and chew them up for food. Fossil Crinoids from the top of the Jemez Mountains in New Mexico. Crinoids grew under the ocean. They looked like plants but they were animals that were stuck in one place. They had a stalk that was attached to the bottom.