Contaminated carbon dating

In learning more about old wood, I learned that this problem occurs for marine archaeologist too.

If a stump from old wood is found underwater at a shipwreck for example then the archaeologist need to be aware and not use this misleading data.

Then when someone comes along and uses the tree for construction purposes or decoration, archaeologist misjudge the age of the site because the woods carbon dating will be older than when the person actually cut down the tree.

In centuries to come a body of a man or animal who lived and died in the 20th century would appear paradoxically of greater age since death than the body of a man or animal of the 19th century, and if the process of industrial use of fossil, therefore dead, carbon continues to increase, as it is expected will be the case, the paradox will continue into the forthcoming centuries.If such reversals were not instantaneous but required thousands of years, the atmosphere during that time would not be shielded from cosmic rays and substantially more of them would reach it.However, the scientific literature of the last few decades did not contain any reference to a reversal observed on human artifacts like pottery though a paper by Manley in 1949 (Science News, Penguin Publication) told of the work of G.The method caught the fancy of the radiocarbon researchers.However, three or four rings formed in one year is not uncommon, especially if the tree grows on a slope, with the ground several times in a year turning wet and dry because of rapid outflow of water (Glueck et al., Botanical Review, 7, 649-713; and 21, 245-365).

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