One method absolute dating

Carbon-14 cannot be used to date biological artifacts of organisms that did not get their carbon dioxide from the air.

Dating schemes based on rates of radioactivity have been refined and scrutinized for several decades.

Archaeologists use many different techniques to determine the age of a particular artifact, site, or part of a site.

Two broad categories of dating or chronometric techniques that archaeologists use are called relative and absolute dating.

Stratigraphy is the oldest of the relative dating methods that archaeologists use to date things.

Stratigraphy is based on the law of superposition--like a layer cake, the lowest layers must have been formed first.