Relative dating stratigraphy

Determining calendar rates using dendrochronology is a matter of matching known patterns of light and dark rings to those recorded by Douglass and his successors.

Many of the first efforts of archaeology grew out of historical documents--for example, Schliemann looked for Homer's Troy, and Layard went after the Biblical Ninevah--and within the context of a particular site, an object clearly associated with the site and stamped with a date or other identifying clue was perfectly useful. Outside of the context of a single site or society, a coin's date is useless.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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