These kinds of brachiopods do not live in any of the oceans today. There used to be a lot of them a very long time ago. Fossil Sharks Teeth from the gulf coast of Florida. These fossil teeth are not very old, only about 25,000 years old. You can find them on the beaches near Venice, Florida.
Sharks still live in the gulf water.
Fossil Shark Teeth from a desert in central New Mexico. These fossil shark teeth are much older. They are about 55,000,000 years old. 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.