Spot dating archaeology

The technique can be used to date objects between 100 and one million years old and is accurate to within 35% of the object's age, the researchers said.

The technique is most accurate when dating objects between 50,000 to 100,0000 years old, the researchers said.By separating a site into basic, discrete units, archaeologists are able to create a chronology for activity on a site and not only describe it, but allow for its interpretation as well.Artifacts can come from many different sources such as: Most grave goods recovered by archaeologists consist of inorganic objects such as pottery, stone, and metal tools, but there is evidence that already decayed organic objects were also placed in ancient tombs.By counting the dark ring segments, scientists can tell a tree’s age if the cross section of the trunk is complete. Based at the University of Arizona in Tucson, Douglass wanted to know how sun spot activity affected climate, and his research soon led him to pioneering tree-ring analysis.Because the width of tree rings varies with growing conditions, scientists also learn about local climate during the tree’s lifetime by comparing the rings’ different widths. For instance, higher rainfall and a longer growing season produces a wider ring than a year with low rainfall and prolonged cold. Douglass was among the first to notice that trees in a geographic area develop the same growth-ring patterns because they experience the same climatic conditions.

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