Dinosaurs around 700,000 years after mass extinction?

In the university of alberta, researchers determined a fossilized hadrosaur femur bone to be 64.8 million years old. This means that the dinosaur was alive around 700,000 years after the mass extinction, believed to be caused by a massive meteorite. Colleagues used a new dating method called U-Pb, which reads the uranium levels in fossils. Normally, bone doesn't have any to a little ammount of uranium, but durring fossilization, the bone is deposited with materials such as uranium. Once fossilization is complete, the uranium starts to deteriorate. In this way, U-Pb can read the uranium levels and date the bone.


http://www.sciencedaily.com/releases/2011/01/110127141707.htm