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Strata Thickness- In the late 1800s, a British geologist estimated that 75 million years has lapsed since the beginning of the Cambrian.

The half-life is the amount of time it takes for one half of the initial amount of the parent, radioactive isotope, to decay to the daughter isotope.Clocks may be used to estimate how long a process has been taking place.All clocks (including radiometric ones) require the use of at least three assumptions.These are: In each of these cases it is not possible to prove that the assumptions are true.For example flooding can greatly alter sedimentation rates, and with clocks over 5,000 years old, the original conditions cannot be known with certainty.The quantitative approach is admirable, but Buffon's assumptions are flawed. Silicate minerals have lower heat conductivity than steels and are better insulators leading to slower cooling rates.

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