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It was not ruled out per se but it was not necessary. there are two isotopes of uranium that decayed to two different isotopes of lead and there s also thorium which decays to another isotope of lead. He was the first modern uniformitarian. Many more meteorites have been sampled and dated. He implicitly assumed that the world was created much as it is now. He would have answered that the earth was ancient that there had not been a noachian flood and that the species of life had not been fixed over the history of earth.
Radiocarbon dating is based on the decay of the short lived c 14 isotope and is irrelevant to determining the age of the earth. Le roy was vague about actual mechanisms. Later in 1897 he revised his estimate downwards to 20 40 million years. 1862 lord kelvin on the secular cooling of the earth. Le roy accepted that land and sea could change places and that mountains could be reduced to plains and vice versa. In the mountains of parma and piacenza multitudes of shells and corals with holes may be seen still sticking to the rocks.
Acknowledgements i particularly want to thank mark isaak who supplied a number of references which were not available to me chris stassen for supplying the section on the history of radiometric dating and andrew macrae who supplied information about hugh miller s the testimony of the rocks. Many online daters enlist their friends in an effort to put their best digital foot forward acceptable dating age. Researchers were unaware that there can be multiple isotopes of the same element each with a different decay rate.You ve got all these separate age equations for the different isotopes of uranium and different isotopes of lead that were formed. De luc s work is transitional between the armchair speculation of the seventeenth century and the hard nosed empiricism of the nineteenth century. New techniques have been devised tested and applied.