Zircon in uraniumlead dating the favorite mineral among upb daters is zircon zrsio 4 this makes it especially valuable for dating these rocks which have no fossils to indicate their age dating a rock involves uraniumlead measurements on many zircons then assessing the quality of the data some zircons are obviously disturbed.
A new technique for dating fossils based on uraniums radioactive properties could mean that palaeontologists will have to revise their theories on the end of the dinosaurs a canadian research team has used a new uraniumlead upb dating technique to show that a fossilised dinosaur bone found.
uranium235 dates older objects so uranium235 would be your answer fossils would carbon14 or uranium235 be better to date a fossil from the precambrian time would carbon14 or uranium235.
uraniumlead dating abbreviated upb dating is one of the oldest 238 u to 206 pb and 235 u to 207 pb leads to multiple dating techniques within the overall upb system the term upb dating normally implies the coupled use of both decay schemes in the concordia diagram see below.
Answerscom 174 categories science earth sciences geology paleontology fossils what is uranium 235 dating what is uranium 235 dating so you get a gradually increasing concentration of uranium.
Carbon14 radiometric dating and index fossils carbon dating is used to determine the age of biological artifacts up to 50000 years old this technique is widely used on recent artifacts but educators and students alike should note that this technique will not work on older fossils like those of the dinosaurs alleged to be millions of years old.