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The radioactive dating methods are often a classic example of self-deception and circular reasoning.

Researchers have found a reason for the puzzling survival of soft tissue and collagen in dinosaur bones - the bones are younger than anyone ever guessed.

A Canadian research team has used a new uranium-lead (U-Pb) dating technique to show that a fossilised dinosaur bone found in New Mexico is only 64.8 million years old, meaning the creature was alive about 700,000 years after the mass extinction event that is believed to have wiped out all non-avian dinosaurs.

A team led by Larry Heaman of the University of Alberta's Department of Earth and Atmospheric Sciences used the method to determine the age of the fossilised femur of a sauropod, a herbivorous dinosaur.

Carbon-14 (C-14) dating of multiple samples of bone from 8 dinosaurs found in Texas, Alaska, Colorado, and Montana revealed that they are only 22,000 to 39,000 years old.

Members of the Paleochronology group presented their findings at the 2012 Western Pacific Geophysics Meeting in Singapore, August 13-17, a conference of the American Geophysical Union (AGU) and the Asia Oceania Geosciences Society (AOGS).

Uranium-235 has a half-life of over 700 million years, while uranium-238 has a half-life of about 4.5 billion years, similar to the age of the Earth itself.

It's accuracy has been verified by using C-14 to date artifacts whose age is known historically.Because fossils are found in sedimentary rock, paleontologists try to use radiometric dating information on igneous rocks found below and above the fossils in order to try and determine an age range for the sedimentary rocks.The isotope concentrations can be measured very accurately, but isotope concentrations are not dates.Certain species are distinctive based on these traits.Since ammonites were pelagic (free swimming) they can be found deposited in a wide range of marine depositional environments.The facts we know about organisms that lived millions of years ago are found in fossils.