Dating methods in archaeology
Potassium-argon (K-Ar) dating is a radiometric technique that is used to determine the age of minerals that contain potassium, which include clay minerals and micas.It is most useful for minerals older than 100,000 years and can reach way back into the geological past.The offset is a function of the orientation of the parison relative to the two molds (parison and blow molds) used on the particular machine, or occasionally, to the hot parison "sticking" to the neck ring of the parison/blank mold when transferring to the blow mold (Ceramic Industry 19-15).
K-Ar dating has been used to date lava flows above and below archaeological deposits that contain important hominid fossils in Africa's Olduvai Gorge.
Working out how old archaeological remains are is a vital part of archaeology.
Scientific dating has confirmed the long residence of Aboriginal people in Australia.
These grains absorb radiation over time from the surrounding sediments and the radiation (electrons) remain trapped within the mineral grain structure.
When the grain is exposed to intense light of particular wavelengths in the laboratory, it emits a light signal with an intensity proportional to the radiation it has absorbed while buried.