Therefore the method is restricted to the areas where volcanic rocks rich in potassium are available. The observation of the amount of patina on a stone may be used at sites where there is a long sequence and demonstrates that those tools which lie in the bottom level may have more patina than those in the upper levels. Subsequently, radiocarbon dating, an absolute dating technique, was used to date the bones directly and provided a date of BP, showing how useful the combined used of relative and absolute dating can be. Archaeologists have access to various techniques for dating archaeological sites or the objects found on those sites.
Following the death of an organism, any exchange ceases and the carbon 14, which is radioactive and therefore unstable, slowly begins to disintegrate at a known rate half-life of years, ie, after this period only half of the total carbon 14 present at the time of death remains. Radiocarbon dating:. Once an artefact is compared to its known development date then dating that item reappears in the archaeological record, of that or any other site, it can quickly be dated. The method is actually devised to measure the amount of low level radioactivity of carbon remaining in ancient and dead material of organic origin.