Old wood effect radiocarbon dating
The deposit must be as young, or younger than the youngest object it contains.
Thus excavators look to post holes, pits, or find spots under the orthostats for clues to construction dates.
Radiocarbon dating of recent water samples, aquatic plants, and animals, shows that age differences of up to 2000 C years can occur within one river.
The freshwater reservoir effect has also implications for radiocarbon dating of Mesolithic pottery from inland sites of the Ertebølle culture in Northern Germany.
This may be the result of growth age; in which the age of dead wood in the centre of the living tree is dated, or storage age; which refers to the amount of time elapsed from the death of the tree to its use by people (Mc Fadgen, 1982).
Inbuilt age may result in errors of up to hundreds of years unless only short-lived species, or twigs, are selected for dating.
Stratification is not always clear-cut in practice.
In the case of dating megalithic tombs, indirect evidence for the age of the tomb must always be obtained, because stone (or the time of moving a stone) can not be dated.
In the late 1950's, the issue of presample age was identified as a causal factor in the difficulties encountered in accurately cross-dating the Julian calendar with that of the Yucatan Maya of Lowland Mexico.
I think that I shall never see, a sample of a plain old tree, a tree that's not been carved or painted, calcified, burned or otherwise tainted, But bones and shells and peat I get; preparing them all day I sweat.
Won't someone please take pity on me, and send in just one plain old tree. A Rafter in Procs 6th international Radiocarbon Conf, Pullman, 1965. The quote given above illustrates the preference that radiocarbon daters have had with dating wood and wood charcoal materials.
These materials are the most widely used material in radiocarbon dating.
Since the inception of the technique in the 1950s, charcoal has been acknowledged as a most reliable material for dating (Libby, 1955).
During cremation bones undergo major morphological and mineralogical changes which have raised some interesting questions and discussion on the origin of the carbon source in archaeologically cremated bones.