For a crossdated age, there should be no question of the age of the portion of the tree sampled, except in any portion of the ring series not confidently crossdated with either other trees at the same site or other sites in the area.Ring-counted ages are derived by simple ring counts and may contain errors in age due to missing or false rings, suppressed areas, poorly surfaced samples, or other types of tree-ring anomalies (e.g., injuries).= word = the science of): The science that uses tree rings dated to their exact year of formation to analyze temporal and spatial patterns of processes in the physical and cultural sciences.The science that uses tree rings to date when timber was felled, transported, processed, or used for construction or wooden artifacts."Age" in these first two types will invariably be a minimum age rather than true chronological age owing to the difficulty of sampling a tree exactly at the point of germination.Extrapolations are ages derived by regression from age/size relationships (e.g.I also must at some point soon go through the recent literature on radiocarbon ages found on several tree species in South American rain forests that are in some cases several hundred to over 1000 years old. (Larger version of header photo; bristlecone pine in the Patriarch Grove in the White Mountains, California) Notes on dates: * tree is still living as of 2012; age given is additional years since it was first sampled when this is known.
This is now the oldest confirmed age of an angiosperm tree, at least twice as old as the second oldest confirmed age for an angiosperm species (although note also the addition of two oaks reported in Jones 1959 that are 866 and 930 years, sent to me by Alexei Rivera; however, we cannot find the original references and these presumably ring-counted ages cannot be confirmed). Example: dating when trees were inundated by water to determine the sequence of lake level changes over time.The science that uses tree rings to date and study past and present changes in wildfires.Example: analyzing changes in tree growth patterns via tree rings to date a series of landslide events.The science that uses tree rings to date and study past and present changes in glaciers.