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Long tree-ring sequences have been developed throughout the world and can be used to check and calibrate radiocarbon dates.
He had assumed that amounts of Carbon-14 in the atmosphere had remained constant through time.
Rodents, for example, can create havoc in a site by moving items from one context to another.
Natural disasters like floods can sweep away top layers of sites to other locations.
Therefore, radiocarbon dates need to be calibrated with other dating techniques to ensure accuracy.
Plants are not the only organism that can process Carbon-14 from the air.