Quote:
Originally Posted by lwadkins  Not to mention that the dating of an object can be affected by what conditions it has endured over the years.  |
Not sure what you mean by this, Lon. Conditions that something has endured can't (at least in any reasonable sense) impact the ratio of different isotopes in the substance.
What is the dagger in the heart of dating methods, rather, is the assumptions made about "original isotope ratios" that are necessary in order to draw conclusions about current ages. Here I talk about things OTHER than the short half-life C-14 dating, which for what it can actually measure does a reasonable job (within the actual accuracy that it can claim - which usually involves quite large uncertainties). The million and billion year timeframes that are claimed for things rely on assumptions about 'original conditions' that aren't testable (unlike the 'original conditions' needed for C-14 dating, which are testable)
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