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This carbon isotope is generated when neutrons produced by collisions between cosmic rays and atoms in the upper atmosphere are captured by nitrogen atoms.Living tissue absorbs small amounts of carbon-14 through respiration and food ingestion.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.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!The influence of humans is of world extent and is so profound that it seems appropriate to have a special geologic name for this time. In addition, some geologists have argued that the time characterized by the rise of humanity should be separated from the time characterized by humanity’s domination over the planet’s ecological systems and biogeochemical cycles, and thus they have proposed that the later part of the Holocene should be classified as a new geologic epoch called the Anthropocene.

An “age” from living shells in such an area can suggest that they are already hundreds of years old.varve chronology can be established.Holocene Epoch, formerly Recent Epoch, younger of the two formally recognized epochs that constitute the Quaternary Period and the latest interval of geologic time, covering approximately the last 11,700 years of Earth’s history.The sediments of the Holocene, both continental and marine, cover the largest area of the globe of any epoch in the geologic record, but the Holocene is unique because it is coincident with the late and post-Stone Age history of humankind. Because there is nothing to suggest that the Pleistocene has actually ended, certain authorities prefer to extend the Pleistocene up to the present time; this approach tends to ignore humans and their impact, however.Obsidian weathers slowly at a uniform rate, and the thickness of the weathered layer is measured microscopically and gauged against known standards to give a date in years.This has been particularly useful where arrowheads of obsidian are included in deposits.paleomagnetism is another phenomenon used in chronology.

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