Different dating methods fossils
Together with stratigraphic principles, radiometric dating methods are used in geochronology to establish the geological time scale.
Among the best-known techniques are radiocarbon dating, potassium-argon dating and uranium-lead dating.
Relative dating methods are unable to determine the absolute age of an object or event, but can determine the impossibility of a particular event happening before or after another event of which the absolute date is well known.
Sedimentary rocks are rarely useful for dating because they are made up of bits of older rocks.
There, you will find a brief description of the method, plus links to take you to other webpages with more extensive information.