Sharks Dominated Prehistoric European Seas

Eighteen new prehistoric sharks have been identified -- but some 60 to 90 percent of all ancient sharks have yet to be identified.

August 7, 2013
7:00 AM EDT
A recreation of Squalicorax, one of 18 shark species identified from fossilized 100 to 72 million-year-old rocks. | Dmitry Bogdanov