The La Brea Tar Pits are a group of tar pits located in Los Angeles, California. They are one of the most famous fossil sites in the world, and have been a source of numerous fossils since their discovery in the late 19th century. The tar pits are formed from natural asphalt seeping up from the ground, and have preserved the remains of animals that became trapped in the tar over thousands of years. The fossils found in the tar pits provide valuable insight into the history of the area, and the species that lived there.