Methods dating dinosaur bones
Then, the current amount of radioisotope is compared to the amount of stable element into which it is slowly changing. However, evidence has mounted that radioisotopes underwent a period of radical acceleration of decay in the past.
If any collagen whatever is still in the bone, this would falsify their evolution-friendly "age." Also, collagen contains carbon.
By examining the object's relation to layers of deposits in the area, and by comparing the object to others found at the site, archaeologists can estimate when the object arrived at the site.
Though still heavily used, relative dating is now augmented by several modern dating techniques.
One clue that they are broken comes from the evolutionary age disagreements that characterize the whole field of radioisotope dating.
For example, an igneous rock from the Grand Canyon—which, unlike sedimentary rock, is a type of rock that has been considered "datable" because the relevant isotopes are locked up in its tiny crystals—was tested by standard means.