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Our editors will review what you’ve submitted and determine whether to revise the article.Join Britannica's Publishing Partner Program and our community of experts to gain a global audience for your work!This involves counting and measuring thicknesses in annual paired layers of lake sediments deposited in lakes that undergo an annual freeze-up.Because each year’s sediment accumulation varies in thickness according to the climatic conditions of the melt season, any long sequence of varve measurements provides a distinctive “signature” and can be correlated for moderate distances from lake basin to lake basin.obsidian (a black glassy rock of volcanic origin) can be used for dating.

Since this prospect has the potential of impacting historical timelines in several fields, scientists recommend that researchers use other dating techniques, such as tree rings and sediment deposits, to verify radiocarbon-calendar conversions.In addition to this calculated error, there also is a question of error due to contamination of the material measured.For instance, an ancient peat may contain some younger roots and thus give a falsely “young” age unless it is carefully collected and treated to remove contaminants.In certain latitudes the tree’s ring growth correlates with moisture, but in others it may be correlated with temperature.From the climatic viewpoint these two parameters are often inversely related in different regions.

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