Fossils suggest ancient sharks survived extinction event
Diving down deep in the ocean may have helped the fish live through the Great Dying
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2013/10/ncomm_fossilfish_860free.jpg?fit=860%2C460&ssl=1)
Shark teeth found in rocks 135 million years old suggest that at least one group of the fish survived a mass extinction 350 million years ago.
G. Guinot et al/ Nature Communications 2013