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Veröffentlicht Friedemann Menzel | Dienstag, 27. Februar 2018

All of them challenged the likelihood of Kelvin's assumptions. Brent Dalrymple's The Age of the Earth. The catastrophists Cuvier , de Beaumont , Buckland accepted that the Earth was old; they disagreed with the kind of change and the rate of change that had occurred over that long history. It was not in their estimates of the age of the Earth - Descartes retained the biblical date. This was a minimum acceptable age consistent with geology. Kelvin did not know about radioactivity and heating of the Earth's crust by radioactive decay; for this reason his estimates were completely wrong.

Unfortunately, Gerling's original calculations are incorrect primarily because Nier's ancient lead ore is not truly primeval in composition. Hall argued that Hutton's water cycles were insufficient to account for large tumbled rocks in the Alps. Geography delineated forth in two Bookes In this early work Carpenter argued that the Flood could not have been the major agent of geological change,.

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There have been significant changes in state due to such factors as declining strength of the radioactive sources of heat, the acquisition of oxygen as a major atmospheric component, the colonization of land by life, plate tectonics, and asteroid bombardment. Holmes was unaware of Gerling's b work and attempted a slightly different technique. Holmes' calculations are called chemical ages as opposed to isotope ages because they are derived from ratios of elements without regard to isotopes. The pre-scientific period before AD The physical models were open to question and, in retrospect, were naive.

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Alfred Nier begins to make a series of careful measurements on the isotopic composition of common lead. The physical models were open to question and, in retrospect, were naive. The idea was good but there were practical problems. So you have three different isotopes of lead.

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Townson was one of the many catastrophists of the late 18'th and early 19'th century. This was too short for the geologists to swallow. The lighter atomic weight of lead in association with uranium is due to enrichment in Pb from decay of U. In the pre-scientific era the Biblical account and the speculations of the Greek philosophers were accepted without great question. Chemical dating methods won't entirely give way to isotope dating methods until almost By Buckland had abandoned the Noachian flood as a source of major geological change.

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There were two major problems with such efforts. Cuvier was the best known and most influential of the catastrophists. Hutton and Lyell, who held that the history of Earth was dominated by slow relatively uniform changes in an Earth with a static over all history.

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Currently the best estimate of the age of the Earth is 4. Drastic changes, albeit not as all embracing as those envisioned by the catastrophist, occur from time to time. Initially little was known about the physics and chemistry of radioactive elements. Using the age of the oldest known at that time Precambrian minerals as a minimum for the Earth's age, Russell said: Arthur Holmes publishes a booklet on the age of the Earth, which becomes fairly popular.

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However, researchers were beginning to realize that the same methods hold promise for assessing the Earth's age. Sacred Theory of the Earth. It should be understood that estimating the ages of rocks using radiometric dating is an entirely separate technique from the radiocarbon C method for dating organic remains. On the Secular Cooling of the Earth. Patterson produces accurate primeval lead isotopic measurements from minerals of the Canyon Diablo meteorite which contain very little less than ten parts per billion uranium.

In between Russell's estimate and roughly World War II, a number of similar chemical ages for the Earth's crust were computed and published. The major debate was between the catastrophists, e. Transactions of the Royal Society of Edinburgh. In Descartes produced a cosmogony that was highly influential for more than a century. A new theory of the Earth

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  1. Geography delineated forth in two Bookes In this early work Carpenter argued that the Flood could not have been the major agent of geological change,. Aston improves upon Thompson's positive-ray apparatus, and invents what he calls a mass spectrograph. By equipment and understanding of the decay process are sufficiently mature to generate an accurate assessment of the age of the Earth.
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  2. Twenty years after the first serious attempts at radioactive-decay ages Boltwood , the total number of computed mineral ages is still small enough that Holmes can summarize them all in one short table. Pallas made extensive observations of Russian mountains. If you asked the same question of an educated European in AD you would have received a quite different answer. Walcott takes a detailed look at the Paleozoic sediments of the Cordilleran Sea just east of the Sierra Nevadas , considering such things as the land area supplying sediments and the grain sizes of the sediments.
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In doing so, Gerling devises the basic technique which will eventually produce an accurate age for the Earth and solar system. His work on tracing the independent curves back to their mutual intersection does not yield meaningful results. A View of Nature. In his notebooks Da Vinci ponders fossil seashells and concludes that they could not have been laid down by the Noachian flood. Arthur Holmes publishes a booklet on the age of the Earth, which becomes fairly popular. This was a minimum acceptable age consistent with geology.

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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. The uniformatarians Hutton , Lyell pictured the Earth as being indefinitely old. If you asked the same question of an educated European in AD you would have received a quite different answer.

General considerations

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Estimates of the age of the Sun were also too small to be consistent with geology. Initially little was known about the physics and chemistry of radioactive elements. Woodward came down fairly strongly for the view that the flood was an act of God that could not be accounted for by normal physical processes. In the early s, however, Holmes' results appeared to be at odds with other methods in common use, and they were not met with immediate acceptance from all quarters. The shrinkage causes the formation of mountains via catastrophic crumpling of the surface. In Ussher produced his famous calculation that the Earth was created in BC.

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