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Folghereiter done at the turn of the century on Attic and Etruscan pottery: he found that the polarity was reversed in the eighth century before the present, era.
To determine the extent of correction necessary to render the radiocarbon method reliable, dendrochronologists devised a plan to control the radiocarbon dates by building a chronology of tree rings of the white bristlecone pine, the longest living tree.
Suess explained the phenomenon by the fact that the increased industrial use of fossil carbon in coal and in oil changed the ratio between the dead carbon C12 and the C14 (radiocarbon) in the atmosphere and therefore also in the biosphere.
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.
The method caught the fancy of the radiocarbon researchers.
Kubler insisted that this heritage could not date from the 8th to 4th pre-Christian centuries, but rather was generated in the 4th to 8th century of the Christian era.
In Worlds in Collision I claimed that the time since the last glaciation needs to be drastically shortened: the figure considered valid in 1950, the year Worlds in Collision was published, was still Lyells of 100 years earlier, namely 35 thousand years. previously this maximum advance had been assumed to date from about 25,000 years ago, actually 35,000 if one looks up the literature of the time. found that, as I also claimed, another advance of ice took place only 3,500 years ago.
Libby found (and I quote Frederick Johnson, who participated in his volume, Radiocarbon Dating) that the advance of the ice occurred about 1 1,000 years ago . A few years later Rubin and Suess of the Geological Survey of the U. The second confirmation came concerning the age of the petroleum. The surprising fact was that oil was found there in Recent sediment and must have been deposited during the last 9,200 years. (Emphasis added.) Actually I asked Libby whether he would see to it that petroleum should be subjected to tests and it was he who drew my attention to the work done by Smith.
Speaking of my research as far as it affects the radiocarbon dating method, I would like to separate the finds concerning natural events (Worlds in Collision, Earth in Upheaval) from finds concerning the true chronology of Egypt and of the ancient World in general (Ages in Chaos).
Libbys discoveries, published in 1952, gave immediate support and even vindication to three independent conclusions of my research into natural events of the past.