Relative dating archaeology absolute vs relative dating fossils
After the 'death' of these organic materials the Carbon-14 atoms decay. Therefore it is possible to measure the number of these atoms in organic materials to obtain quantified information on the date of an item.
If the sequence of rings is know for a certain area it is possible to fit in all new woods found and to date them very precisely.In Egyptology the method was first used by Petrie for dating the Naqada period, from the development of the so-called wavy-handled pottery.- At least some objects belonging to such a typology should be datable by other criteria to fix a typology into a chronological framework. An object category or motif might develop not regularly but in staccato 'jumps'.For a fossil to be a good index fossil, it needs to have lived during one specific time period, be easy to identify and have been abundant and found in many places. If you find ammonites in a rock in the South Island and also in a rock in the North Island, you can say that both rocks are Mesozoic.Different species of ammonites lived at different times within the Mesozoic, so identifying a fossil species can help narrow down when a rock was formed.
Fossils are important for working out the relative ages of sedimentary rocks.