Brad Wallace November 27, 2014 Thousands of Eocene Shark Teeth Found in Canadian Arctic Brad Wallace November 27, 2014 Not a Canadian Scientist, but it's science done in the Canadian Arctic, so that counts, right? Besides - sharks! The researchers wondered why the diversity of the shark teeth they found was so low. “We have got four genera so it is not a lot of diversity, and yet we know during this time, the early Eocene, the climate was warmer than at any other time since the extinction of dinosaurs, and we know the Arctic was much warmer in the early Eocene [than it is now],” Eberle said. The warmer water would be expected to hold a higher diversity of shark species than what the researchers found.