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Why is carbon-14 used for radiocarbon dating. Can you use radiocarbon dating on shale containing leaf fossils

Overall, the geologic time scale is in great shape. Now, according to Woodmorappe's citations, many lava flows have no such limits at all, and most of them have large limits. We also have direct observation: These anomalies are reported in the scientific literature. Sorry, no dinosaur drawings were reported!

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Henke referenced Davis A. Thus we have another source of error for K-Ar dating. Inthe present authors published 9 a new carbon-extraction method for iron based on a sealed-tube combustion with CuO in quartz.

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Weight percent carbon vs. Zoser lived during the 3rd Dynasty in Egypt BC. Now, there is probably not much argon in a rock to start with. A piece of wood, for example, would soon turn into a formless cloud of graphite or soot in the soil, with perhaps a little ash marking the original shape!

If you were to measure Ar40 concentration as function of depth, you would no doubt find more of it near the surface than at deeper points because it migrates more easily from deep in the earth than it does from the earth into the atmosphere.

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This affects the ratio of 14 C to 12 C in the different reservoirs, and hence the radiocarbon ages of samples that originated in each reservoir. We also have laboratory studies which support the constancy of all the decay rates used in radiometric dating.

It takes a long time to change the carbon material into the form it needs to be in to be able to be dated. This shows that rocks can adsorb a large amount of argon relative to the argon needed to give them old K-Ar ages, and also suggests that old K-Ar ages can be produced by external argon from the mantle.

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For example, different kinds of quartz have different colors due to various impurities that are included but not part of the repetitive unit of the quartz crystal. So to assume that the K-Ar dates, Rb-Sr dates, and U-Pb dates all reflect the age of the lava, one would have to assume that this lava had no Sr, no Pb, and that all the argon escaped when the beads formed.

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Whatever is making some of these dates inaccurate could be making all of them inaccurate. As for K-Ar dating, here is a quote given above: It's the responsibility of the geologist to show that such mixings have not occurred.