These results were published in Science in Views Read Change Change source View history. So it was expected that most deposits such as coal, gas, petrified trees, etc. Dating material from one location gives date information about the other location, and the dates are also used to place strata in the overall geological timeline. However, under about 20, years the results can be compared with dendrochronologybased on tree rings.
It frequently happens that a sample for radiocarbon dating can be taken directly from the object of interest, but there are also many cases where this is not possible.
The calculation uses 8, the mean-life derived from Libby's half-life of 5, years, not 8, the mean-life derived from the more accurate modern value of 5, years. Research has been ongoing since the s to determine what the proportion of 14 C in the atmosphere has been over the past fifty thousand years. Radiocarbon dating is generally limited to dating samples no more than 50, years old, as samples older than that have insufficient 14 C to be measurable. There was initial resistance to these results on the part of Ernst Antevsthe palaeobotanist who had worked on the Scandinavian varve series, but his objections were eventually discounted by other geologists. Namespaces Article Talk.