Chronometric absolute dating techniques are based on y alphabetical index of dating resources

The sequence of development of culture or the relationship between events that represent culture can be established only when events can be placed in proper time.

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.It has been used in Baltic area, North America, South America and Africa.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.First, it is because varve accumulation occurs only to glacial areas of the world.

Second, many of the Pleistocene glacial areas has receded nowadays and affecting the supply of sediments.the 'fossil' tracks counted) viz., exposes the sample to a known number of low energy (thermal)neutrons which induce fission of a small fraction of the uranium atoms in the sample.The sample is immersed in the proper chemical reagent, which allows rapid attack of the narrow regions of damage and slower dissolution of the adjacent unchanged material.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.Fission Track Technique - This technique dates material ranging from 20 years to 1,000,000,000 years before the present.