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Species which make good index fossils are able to tolerate a wide range of ecological conditions, are geographically widespread, common, easy to find, and evolutionarily short-lived (that is, they speciated and then quickly became extinct).The object's approximate age can then be figured out using the known rate of decay of the isotope.The half-life of radiocarbon is years, so you can reliably date stuff about 50, years old and younger. Plotting an isochron is used to solve the age equation graphically and calculate the age of the sample and the original composition. In lakes and bogs, studies often radiocarbon date bulk organic matter or individual macrofossils, like seeds.This predictability allows the relative abundances of related nuclides to be used as a clock to measure the time from the incorporation of the original nuclides into a material to the present.
It is not affected by external factors such as temperature , pressure , chemical environment, or presence of a magnetic or electric field.
Continue Reading Relative age comes up often in various fields, such as archeology.