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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.
For example, JJA Worsaae used this law to prove the Three Age System.
Seriation, on the other hand, was a stroke of genius.
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.
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Two broad categories of dating or chronometric techniques that archaeologists use are called relative and absolute dating.There are dendrochronological records for Europe and the Aegean, and the International Tree Ring Database has contributions from 21 different countries.
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