The limitations of accuracy of radiocarbon age determinations are expressed as ± a few tens or hundreds of years.
In addition to this calculated error, there also is a question of error due to contamination of the material measured.
An “age” from living shells in such an area can suggest that they are already hundreds of years old.
The shows the comparative dates of radiocarbon years and those obtained by other means.
Archaeologists use it as the time standard against which they trace the development of early civilizations.carbon-14 dating.
Because the age determined by the carbon-14 method may be appreciably different from the true age in certain cases, it is customary to refer to such dates in “radiocarbon years.” These dates, obtained from a variety of deposits, form an important framework for Holocene stratigraphy and chronology.
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 mankind.
Finally, the measurement and analysis of tree rings (or dendrochronology) must be mentioned.
The age of a tree that has grown in any region with a seasonal contrast in climate can be established by counting its growth rings.
From the climatic viewpoint these two parameters are often inversely related in different regions.
Nevertheless, in experienced hands, just as with varve counting from adjacent lakes, ring measurements from trees with overlapping ages can extend chronologies back for many thousands of years.
Sometimes, as in a very severe season, a growth ring may not form.