So how do we know how old a fossil is there are two main methods determining a fossils age relative dating and absolute dating relative dating is used to.
Fossils amp dating methods chapter exam instructions choose your answers to the questions and click next to see the next set of questions you can skip questions if you would like and come back to.
Carbon14 radiometric dating and index fossils carbon dating is used to determine the age of biological artifacts up to 50000 years old this technique is widely.
index fossil dating chart methods of isotopic measurement continue to be refined today and absolute dating has become an essential component of virtually all.
Using this method weve been able to figure out how old various rocks are and learn a lot about earths history using these methods weve even been able to figure out the age of the earth itself around 454 billion years use of index fossils a related method we use to date rock is the use of reference fossils.
The best examples are fossils of animals or plants that lived for a very short period of time and were found in a lot of places ammonites shelled relatives of todays octopus make ideal index fossils suppose a dinosaur fossil has been found in the beds of an ancient delta the mouth of a river leading to the sea.
Geol 102 historical geology spring semester 2018 index fossils radiometric dating the single most important method of determining numerical rock ages.
How fossils are dated excerpt correlations are especially reliable when they include index fossils absolute dating of fossils requires other dating methods.
Some fossils called index fossils are particularly useful in correlating rocks 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 for example ammonites lived in the mesozoic era.
Here of some of the welltested methods of dating used in the the dating rocks and fossils using geological methods article in natures excellent scitable.