Direct dating fossils
Then, the current amount of radioisotope is compared to the amount of stable element into which it is slowly changing. However, evidence has mounted that radioisotopes underwent a period of radical acceleration of decay in the past.This evidence has indicated that radioisotopes have not decayed at a constant rate, and therefore the radiodating "clocks" in general are all broken.But this "age" was not only the result of a broken radioisotope system, it was contrived to agree with previously assigned dates for the samples.The scientists analyzed the abundance of radioactive isotopes of certain elements that had leeched into the edges of buried dinosaur bone from the San Juan Basin in northern New Mexico and southern Colorado.Where igneous rocks are absent, a fossil's "age" is determined by comparing the fossils of one location to those of another, and then comparing those comparisons to charts in books with age assignments provided on the pages.But in standard studies, no age assignment is ever accepted unless it conforms to the "millions of years" doctrine of evolutionary earth history.
Can yield environmental evidence as far back as 3mya`Based on observation that the annual growth rings of a few tree species vary in width according to differences in seasonal growing conditions (esp. Successful means of calibrating or correcting radiocarbon dates2.
pointed out one of the big problems with this dating approach by saying that the past "methods are far from perfect: it is difficult to gain accurate depositional ages for sedimentary rocks, and matters can be further complicated when millions of years of geologic and environmental forces cause erosion of fossil-bearing strata." They highlighted its "success" by contrasting it with the lack of success of prior dating techniques.
It is rare that a weakness in the "millions of years" dating of earth materials is ever mentioned in standard earth science publications.
deposit and can be no alter (no more recent) than the deposit itself Allows to date a field site by dating an artifact because of association Nitrogen, fluorine, uranium, collagen content, gradually reduced by process of chemical decay. Very variable, depends on site's chemical content as well.
Cannot form a basis of absolute dating, but on an individual site, chem, dating can distinguish bone on different age found in apparent stratigraphic association Duration of different artifact styles that governs seriation Artifacts are arranged acc.