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Amino Acid Racemisation, a method of absolute dating applied to human fossils is developed very recently.

They are engaged in defining the stages of hominid evolution and their artifactual record, and the assignment of a chronology to these stages.

Chronology is the science of measuring time and ordering of the things in time.

The emergence of man through the process of biological and cultural evolution is a story of long span of time.

For the archaeologist and the prehistorian who deals with that long history of man, time is the most important consideration.

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.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.Amino Acid Racemisation (AAR) is a useful comparative dating method with great potential, but it introduces problems of calibration and the requirement of an intimate knowledge of the palaeoenvironmental conditions of the bone deposition site.Table-1: The hominid fossil record is extremely fragmentary, and chronology is essential in unravelling the complex record of human development.According to the Dictionary of Anthropology, the word chronology means the science of computing dates or treaties showing arrangement of events with dates.