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Dendrochronology absolute relative dating

Relative dating is a dating method that used to determine determine the relative ages of geologic strata, artifacts, historical events, etc.This technique does not give specific ages to items.It only sequences the age of things or determines if something is older or younger than other things.Some types of relative dating techniques include climate chronology, dendrochronology, ice core sampling, stratigraphy, and seriation.

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Since young trees grow at different rates a mathematical function was created that converts a tree’s rings into a standard index that takes the tree’s age into account.RADIOCARBON DATING Discovered by William Libby (1908-1940) in 1950, even though it is not as precise as tree-ring dating, radiocarbon dating is the most widely used dating technique . Of the three groups of carbon isotopes (C-12, C-13, and C-14) C-14 (having 14 electrons) is the rarest, being that only one atom in a trillion is C-14.It is formed as nitrogen loses a neutron, and is then oxidated to form CO2, which is them absorbed by most every living plant and then into animals (herbivores, first, then carnivores).Between the years of 17, James Hutton and William Smith advanced the concept of relative dating.Hutton, a Scottish geologist, first proposed formally the fundamental principle used to classify rocks according to their relative ages.The scholar most associated with the rules of stratigraphy (or law of superposition) is probably the geologist Charles Lyell.The basis for stratigraphy seems quite intuitive today, but its applications were no less than earth-shattering to archaeological theory.While some archeologists working with indigenous people incorporate traditional concepts of time into their research, the linear view of time lies behind most archeological research.Archeologists seek to date sites and their associated artifacts and events as accurately as possible so to interpret past human behavior.In other words, artifacts found in the upper layers of a site will have been deposited more recently than those found in the lower layers.Cross-dating of sites, comparing geologic strata at one site with another location and extrapolating the relative ages in that manner, is still an important dating strategy used today, primarily when sites are far too old for absolute dates to have much meaning.

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