Are there problems with radiometric dating. Radiometric dating
For this type of "relative dating" to work it must be known that the succession of events is unique or at least that duplicate events are recognized -- e.
The time when the small stump was made would thereby be determined from the position of its outer ring alongside the year record.
However, Harland et al imply that nearly the correct value for the branching ratio has been known and used since the mid-fifties. We can also say that certain formations tend to give reliable dates and others do not, depending on whether the dates agree with K-Ar dates.
But if we really understand what is going on, then we should be able to detect discrepant dates as they are being measured, and not just due to their divergence from other dates. Consequently, the key to absolute dating of obsidian is to evaluate K for different temperatures.
The solar estimate was based on the idea that the energy supply for the solar radioactive flux is gravitational contraction. Starting with the Bible produces different conclusions than starting with evolutionary reasoning.
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These anomalies are reported in the scientific literature. In the American Southwest, success has been achieved with yellow pine, Douglas firand even sagebrush.
Another observation was the similarity of the fossils observed within the succession of strata, which leads to the next topic. There are so many mechanisms that it is hard to know what pattern to expect, and one does not need to rely on any one of them such as more argon in the magma in the past to account for problems in K-Ar dating.
It's not clear to me if this three dimensional plot always works, and how often it is used. It gives the diffusion equation for argon escaping from a rock as it cools.
Second, there may have been a lot more more argon in the magma in the past, and with each eruption, the amount decreased. Where do we find recently-formed carbonate deposits?
Geologic processes as absolute chronometers
It is true that radioisotope decay rates are stable today and are not largely affected by external conditions like change in temperature and pressure, but that does not mean that the rate has always been constant.
The Cambrian period is conventionally assumed to have begun about million years ago.
The carbon dates have been carefully cross-checked with non-radiometric age indicators. Magnetic minerals in rocks and in articles of fired clay provide the record of ancient change, for they took on the magnetic field existing at the time of their creation or emplacement.
Vast amounts of data overwhelmingly favor an old Earth.
It consistently occurs below the first occurrence of Bacultes jenseni and above the occurrence of Baculites cuneatus within the upper part of the Campanian, the second to last "stage" of the Cretaceous Period in the global geological time scale.
They also pointed out that for the anomalies to be accounted for by excess argon, unreasonably high partial pressures of Ar during crystallization would have to be required.
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It had been noted that some minerals which yield such dates as beryl, cordierite, etc. The rocks were tested as whole-rock samples using K-Ar dating and also separated into individual minerals. When a geologist collects a rock sample for radiometric age dating, or collects a fossil, there are independent constraints on the relative and numerical age of the resulting data.
Assumption 1 was proven false when scientists from the RATE group had rocks of known age dated.