11 February 2011
Posted in DinoDigs
It has long been believed that all non-avian dinosaurs were made extinct 65.5 to 66 million years ago when debris from a giant meteorite impact blocked out the sun from the Earth’s atmosphere. The meteorite impact changed the climate of Earth and killed its vegetation and was thought to have killed off most dinosaurs. A new discovery, reported by geology journal, may prove otherwise.
A team of researches from the University of Alberta, led by Larry Heaman from the Department of Earth and Atmospheric Sciences, used Uranium Lead dating (a newer form of dinosaur dating) to determine the age of a hadrosaur femur bone to be 700,000 year after the supposed mass extinction. Heaman has a few different explanations as to how this dino could have escaped extinction; vegetation may not have been killed in all areas of the earth and this species of hadrosaur survived or the eggs of the hadrosaur may have been able to survive the extreme climate change. Heaman and his team plan to test more bones with uranium-lead dating and believe the end date of dinosaurs may have to be revised in the future.
Larry Heaman with the hadrosaur femur bone fossil