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Dendrochronology has been extended in the American southwest to 322 BC, by adding increasingly older archaeological samples to the record.

There are dendrochronological records for Europe and the Aegean, and the International Tree Ring Database has contributions from 21 different countries.

Like tail fins on a Cadillac, artifact styles and characteristics change over time, coming into fashion, then fading in popularity. The standard graphical result of seriation is a series of "battleship curves," which are horizontal bars representing percentages plotted on a vertical axis.

Plotting several curves can allow the archaeologist to develop a relative chronology for an entire site or group of sites.

For detailed information about how seriation works, see Seriation: A Step by Step Description.

For example, since each Roman emperor had his own face stamped on coins during his realm, and dates for emperor's realms are known from historical records, the date a coin was minted may be discerned by identifying the emperor depicted.Archaeologists use many different techniques to determine the age of a particular artifact, site, or part of a site.Two broad categories of dating or chronometric techniques that archaeologists use are called relative and absolute dating.Douglass believed that solar flares affected climate, and hence the amount of growth a tree might gain in a given year.His research culminated in proving that tree ring width varies with annual rainfall.




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