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.
Application of scientific methods, also called absolute dating, started to be used in the 1980s and since then has increased more and more its significance, as judged by the large number of papers published in the last two decades on this subject (Rowe Absolute and relative dating methods have been used to establish tentative chronologies for rock art.
Relative dating refers to non-chronometric methodologies that produce seriation based on stylistic comparison and stratigraphic assumptions.
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.
Chronology, the study of events in time frame, is hence the central theme of archaeologist, like the geologist who deals with the story of earth history.
Any study of the origins of human must be set in a chronological context.
The application of varve dating is restricted by several factors.As the damage sites are permanent, a simple count of their number allows an age to be measured.The density of track depends on the uranium content as well as the age of the sample (i.e.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.It has been used in Baltic area, North America, South America and Africa.