Fossils of shark teeth are common around the world, but specimens of shark cartilaginous bones are rarely preserved. So people don't know what sharks used to look like, even if they were many.
Paleontologists discovered several skulls and an almost complete shark skeleton specimen from two species of Phoebodus, a primitive shark genus that, in the Eastern anti-atlas Mountains of Morocco. The limited water circulation and low oxygen environment there preserved these shark fossils. These animal specimens will help people understand how older predators hunted.