The Sharktooth Hill Bone Bed in California contains a 700,000 year fossil record of life and death along the coastline of ancient California.
Since the bed’s discovery in the 1850s, paleontologists have battled over an obvious question: How did the bones get there? Was this a killing ground for megalodon, a 40-foot version of today’s great white shark? Was it a long-term breeding area for seals and other marine mammals, like Mexico’s Scammon’s lagoon is for the California gray whale? Did a widespread catastrophe, like a red tide or volcanic eruption, lead to a massive die-off?
The new and extensive study of the fossils and the geology of Sharktooth Hill tells a less dramatic story, but an important one, for understanding the origin of rich fossil accumulations, said Nicholas Pyenson, a former UC Berkeley graduate student who is now a post-doctoral fellow at the University of British Columbia.