On the west side of the peninsula there are sandstone cliffs along the ocean, called the Sunset Cliffs. Geologically these cliffs are known as the Point Loma Formation. They contain fossils, including dinosaur fossils, from the Late Cretaceous period, about 75 million years ago. The formation represents one of the few sites containing dinosaur fossils in the state of California. Overlying the Point Loma Formation is another Late Cretaceous deposit called the Cabrillo Formation, which crops out in various areas of Point Loma.