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.Such treatment are used to create etch pits of optical size, each one making a single fission site.The method requires sufficient uranium to produce a track density, which can be counted within reasonable time.
However, instead of the limitations, varve analysis can be used indirectly for archaeological dating.
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.
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.