Types of fossil dating techniques Xxx galfrie
In special cases, bones can be compared by measuring chemicals within them.
Buried bones absorb chemicals, such as uranium and fluorine, from the surrounding ground and absorb more of these chemicals the longer they remain buried.
A common problem with any dating method is that a sample may be contaminated with older or younger material and give a false age.
This problem is now reduced by the careful collection of samples, rigorous crosschecking and the use of newer techniques that can date minute samples.
Measuring the proportions of argon-39 and argon-40 within a sample allows the age of the sample to be determined.
Only one sample is required for this method as both the argon-39 and argon-40 can be extracted from the same sample.
The number of tracks increases over time at a rate that depends on the uranium content.An object can be given an approximate date by dating the volcanic layers occurring above and below the object.Argon is gas that gradually builds up within rocks from the decay of radioactive potassium.It is possible to calculate the age of a sample by measuring the uranium content and the density of the fission tracks.The age of volcanic rocks and ash can be determined by measuring the proportions of argon (in the form of argon-40) and radioactive potassium within them.