[Regulator75]

http://www.livescience.com/48937-anc...an-arctic.html

The stark, barren landscape of Banks Island in Canada has yielded an unexpected find — more than 8,000 shark teeth that date back millions of years, and have now been described in a study.

"Probably the biggest surprise, at least at first, was that most of them — literally thousands of these things — belong to just two shark genera, and they are both within the sand [tiger] type of sharks," Eberle said. The two genera are Striatolamia and Carcharias, according to the paper.

The researchers went back to the island in 2010 and 2012 to collect more shark teeth. They estimate that the teeth date to the late-early or middle Eocene epoch, or about 53 to 38 million years ago, according to the study, published in the November issue of the Journal of Vertebrate Paleontology.