Dating technique fluorine nitrogen uranium
According to the Dictionary of Anthropology, the word chronology means the science of computing dates or treaties showing arrangement of events with dates.
In other words, Chronology is the arrangement of events, or the materials which represent them, in the order of their occurrence in time.
Besides these two a number of other absolute method like thermo luminescence, dendrochronology, Electron Spin Resonance etc.
also proved very helpful for dating various events of the past.
Therefore outside Scandinavia it is difficult to find continuous sequence of varves reaching the present.
The longest sequence known goes back only 17,000 years.
Any study of the origins of human must be set in a chronological context.
The application of varve dating is restricted by several factors.
In North America, Ernst Antevs has made several attempts to relate Pleistocene geological formations in the American Southwest to events that produced varves in the northern parts of North America.
Amino Acid Racemisation, a method of absolute dating applied to human fossils is developed very recently.
This is based on the fact that all living organisms have L-amino acid in their protein and after death, and over a long period of time all the L-amino acids except glycine undergo change called racemisation and became non protein D-amino acid.
Carbon dating discovered in 1955, proved very helpful for establishing absolute dating in various archaeological sites.
Potassium-Argon (K40) method extends the range of absolute dating beyond the limit of radio-carbon.