Shark Tooth Ridge in central New Mexico is an outcrop of the Morrison Formation, which holds a remarkably high density of fossils. In this particular region, petrified sharks teeth are quite prevalent. Ant hills on top of the ridge feature small teeth moved to the surface by the ants. While there are considerably larger teeth to be found at the site, the ant hills make for an easily-accessible, high density source of fossils. The greenish rocks that the teeth are mixed in with are typical of the Morrison.