Science has absolutely no idea how old fossils are but will insist on using conjecture of millions of years to date them when they have no facts with which to determine there age.
No one can determine how much time elapsed for layers of earth to be laid down so why do the scientist keep giving us their hypothetical speculations as facts?

In some cases they use the amount of earth covering them then in some cases they do not, because like some dinosaurs bones, they are on the surface, indicating that they were wiped out by the flood of Noah's day, which is logical, but not acceptable for the ungodly science person.

Only the bible told science were Nineveh was because the bible has an accurate history but science has a problem with its vision.