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Stratigraphic dating is based on the principle of depositional superposition of layers of sediments called strata.
More in-depth information about old civilizations is also available due to radiocarbon dating results on bones. The organic portion is protein; the inorganic portion is the mineral hydroxyapatite, which is a combination of calcium phosphate, calcium carbonate, calcium fluoride, calcium hydroxide, and citrate.They are called chronometric because they allow one to make a very accurate scientific estimate of the date of an object as expressed in years.They do not, however, give "absolute" dates because they merely provide a statistical probability that a given date falls within a certain range of age expressed in years.This works better in temperate areas that have more distinct growing seasons (and this rings) and relatively long-lived tree species to provide a baseline.
Techniques of recovery include: Data collection and analysis is oriented to answer questions of subsistence, mobility or settlement patterns, and economy.Radioactive carbon has a half-life of approximately 5,730 years which means that every 5,730 years, half of the carbon-14 will have decayed.