They then used these measurements to estimate an age for the bone.But radiodating cannot proceed without some primary assumptions: the starting conditions of a given sample (e.g., how much of each isotope was present in the beginning), a steady rate of decay of certain radioactive isotopes of elements called radioisotopes, and a lack of tampering with the system (e.g., elements added or subtracted since the radioisotope "clock" first began counting time).That's a tough question, and the reality is we'll probably never actually know.
A trio of geologists has published what they called the first successful direct dating of dinosaur bone.
They used a new laser technique to measure radioisotopes in the bone, yielding an age of millions of years.
However, the method used by Simonetti and his colleagues determined that the New Mexico plant eating dinosaur was alive roughly 700,000 years after the surmised giant extinction event.
Although the challenge to the accepted dinosaur extinction model has received the most attention, Simonetti believes that the dating method described in the paper is especially significant.
You might think dating dinosaurs would be an easy task, but in reality it's actually quite difficult.
We date dinosaurs based on where we find their fossils, using the ages of the rocks that they're found in.
The current method paleontologists use to date dinosaur fossils is a technique called relative chronology.
The method estimates a fossils age relative to the known age of deposits of sediment in which it was found.
Past events cannot be repeated as per scientific methodology.
For example, try to repeat Abe Lincoln’s life—no one can do it.
There has been wide agreement among paleontologists that dinosaurs became extinct roughly 65.5 million years ago.