From New Scientist:
Shark versus whale, 4 million years BC
* 13:00 05 May 2009 by Ewen Callaway
Palaeontologists have discovered a fossilised great white shark tooth lodged in a four-million-year-old whale mandible bone – a first.
A team led by Dana Ehret, of the Florida Museum of Natural History in Gainesville, unearthed the unique specimen in southern Peru’s Pisco Formation, which during the Pliocene, the period around 2 to 5 million years ago, was an ocean.
But did the shark kill the whale, or merely scavenge its corpse? Find out in our gallery
Journal reference: PALAIOS, DOI: 10.2110/palo.2008.p08-077r
Fossil Shark And Seal Bone Bed Helps Reconstruct Life Along California’s Ancient Coastline: here.
Pliocene shark fossils in the Netherlands: here.