Difference between chronometric dating relative dating if fupdating tcontrol

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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.Clark Wissler, an anthropologist researching Native American groups in the Southwest, recognized the potential for such dating, and brought Douglass subfossil wood from puebloan ruins.Unfortunately, the wood from the pueblos did not fit into Douglass's record, and over the next 12 years, they searched in vain for a connecting ring pattern, building a second prehistoric sequence of 585 years.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.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.

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It was now possible to assign a calendar date to archaeological sites in the American southwest for over 1000 years.For example, JJA Worsaae used this law to prove the Three Age System.Seriation, on the other hand, was a stroke of genius.His research culminated in proving that tree ring width varies with annual rainfall.Not only that, it varies regionally, such that all trees within a specific species and region will show the same relative growth during wet years and dry years.

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