If they can find a match, then the unknown sample can be dated, providing archeological information. Scientists do this by comparing the tree-ring pattern of samples with unknown dates to known samples from the same geographical area. These plugs mark the spot where researchers have taken a core sample to try to determine the age of the wood by examining its tree rings. What is Dendrochronology?Īround the Upper and Lower Cliff Dwellings, small, numbered plugs dot pieces of wood. A cross-section of a tree showing concentric growth rings.
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