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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 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. In fact, chronology is one of the most fundamental issues in and perhaps a characteristic of archaeology.
Datingin geologydetermining a chronology or calendar of events in the history of Earthusing to a large degree the evidence of organic evolution in the sedimentary rocks accumulated through geologic time in marine and continental environments. To date past events, processes, formations, and fossil organisms, geologists employ a variety of techniques. These include some that establish a relative chronology in which occurrences can be placed in the correct sequence relative to one another or to some known succession of events. Radiometric dating and certain other approaches are used to provide absolute chronologies in terms of years before the present. The two approaches are often complementary, as when a sequence of occurrences in one context can be correlated with an absolute chronlogy elsewhere.
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