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Consider this—if a specimen is older than 50,000 years, it has been calculated, it would have such a small amount of C that for practical purposes it would show an ‘infinite’ radiocarbon age. Readers are referred to this article for other interesting conclusions about these dates.So it was expected that most deposits such as coal, gas, petrified trees, etc. In fact, of 15,000 dates in the journal to 1968, only three were classed ‘un-dateable’—most were of the sort which should have been in this category. [Editor’s note: The graph below was reproduced from a sketch in the original magazine.Libby knew that C was entering and leaving the atmosphere (and hence the carbon cycle).Because Libby believed that the Earth was millions of years old, he assumed that there had been plenty of time for the system to be in C was entering the atmosphere as fast as it was leaving—calculations show that this should take place in about 30,000 years, and of course the Earth was much older than that, said the geologists.

Certainly if there was such a Flood, as we maintain from several other lines of evidence and reasoning, most living things would have perished, and so we would expect a ‘cut-off’ point at this time. In other words, we have a ‘clock’ which starts ticking at the moment something dies.Obviously this only works for things which once contained carbon—it can’t be used to date rocks and minerals, for example. We obviously need to know this to be able to work out at what point the ‘clock’ began to tick.In fact, the whole method is a giant ‘clock’ which seems to put a very young upper limit on the age of the atmosphere.The article is in straightforward language and the non-technical reader could profitably work through it.

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