Carbon dating human bones in the body
This is at least close to what I am looking for. We will have to restrict ourselves to places where Gi is exposed, to avoid having to dig deep within the earth. All of these special problems as well as others can produce contradictory and erroneous results for the various radiometric dating systems. The lungs sit in the pleural cavity. This also justifies Slusher's statements about argon moving in and out of rocks with ease.
Thus the agreement found between many dates does not necessarily reflect an agreement between different methods, but rather the agreement of the K-Ar method with itself. The rate of diffusion is proportional to the gradient of argon concentration, and increases rapidly with temperature. The only correlation I know about that has been studied is between K-Ar and Rb-Sr dating on precambrian rock. For example, a flow lying on precambrian rock with nothing on top would have no limits on its dates.
We can assume that the Precambrian rocks already existed when life began, and so the ages of the Precambrian rocks are not necessarily related to the question of how long life has existed on earth. Of course, these statements are inaccurate generalizations.
But since these multiple mixing tests are more difficult and expensive, they may not be done very often. The partial pressure of argon should be largest deepest in the earth, and decrease towards the surface. Argon, the daughter substance, makes up about one percent of the atmosphere, which is therefore a possible source of contamination.
Nerves connect the spinal cord and brain to the rest of the body. At the moment of formation, as two nucleii collide, the uranium nucleus will be somewhat unstable, and thus very likely to decay into its daughter element. In a single rock there may be mutually contaminating, potassium- bearing minerals. Zircons exclude lead, for example, so U-Pb dating can be applied to zircon to determine the time since lava cooled.
Unreliability of Radiometric Dating and Old Age of the Earth
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