Ashmoo (talk) , 1 March 2011 (UTC) We have it as a full subheader within "Fluorine", but I am thinking to squash it down to a sentence.
Seems less notable than C-14 or heavy isotope dating.
Instead, other methods are used to work out a fossil’s age.
These include radiometric dating of volcanic layers above or below the fossils or by comparisons to similar rocks and fossils of known ages.
Knowing when a dinosaur or other animal lived is important because it helps us place them on the evolutionary family tree.
Accurate dates also allow us to create sequences of evolutionary change and work out when species appeared or became extinct. These are: Where possible, several different methods are used and each method is repeated to confirm the results obtained and improve accuracy.
Older bones have more fluorine and uranium and less nitrogen.
But because decomposition happens at different speeds in different places, it's not possible to compare bones from different sites.
In 1953 this test was used to easily identify that the 'Piltdown Man' was forged, almost 50 years after it was originally 'unearthed'.
Fluorine absorption dating can be carried out based on the fact that groundwater contains fluoride ions.
Items such as bone that are in the soil will absorb fluoride from the groundwater over time.