methods rely on characteristic faunal and geological patterns to bracket the period when the fossil existed.A form of radiometric dating used to determine the age of organic remains in ancient objects, such as archaeological specimens, on the basis of the half-life of carbon-14 and a comparison between the ratio of carbon-12 to carbon-14 in a sample of the remains to the known ratio in living organisms. A technique for measuring the age of organic remains based on the rate of decay of carbon 14.He is presently employed in the Space & Atmospheric Sciences Group at the Los Alamos National Laboratory.Radiometric dating--the process of determining the age of rocks from the decay of their radioactive elements--has been in widespread use for over half a century. This is an informational tour in which students gain a basic understanding of geologic time, the evidence for events in Earth’s history, relative and absolute dating techniques, and the significance of the Geologic Time Scale.
In living organisms, which are always taking in carbon, the levels of carbon 14 likewise stay constant.
The procedure of radiocarbon dating can be used for remains that are up to 50,000 years old.
Wiens has a Ph D in Physics, with a minor in Geology.
I have integrated this web page on human evolution into an electronic text, " Nature's Holism - Holism.
Evolution & Ecology " (see its HOME PAGE .) The result is that some areas, such as the glossary are shared.
But in a dead organism, no new carbon is coming in, and its carbon 14 gradually begins to decay.