Chronometric dating techniques provide
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.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.They are engaged in defining the stages of hominid evolution and their artifactual record, and the assignment of a chronology to these stages.
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.
Understanding the geologic history of an area and the different strata is important to interpreting and understanding archaeological findings.
The increasing accuracy of the various new techniques has brought about major changes in archaeological research strategies.
Fission Track Technique - This technique dates material ranging from 20 years to 1,000,000,000 years before the present.
Fission track dating is based upon the fact that over geological time spontaneous fission of uranium-238 impurities produces minute sub- microscopic damage trails in the most insulating solids, both long period of time.
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.