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Gregory Brennecka of Arizona State University and colleagues measured the relative amounts of Uranium 238 to Uranium 235 from several samples taken from the large Allende meteorite, named for the village in Mexico near where it landed in 1969.
With the more sensitive instrument, they detected small differences in isotope ratios from different inclusions within the same meteorite..
Studying the layers of rock or strata can also be useful. If a layer of rock containing the fossil is higher up in the sequence that another layer, you know that layer must be younger in age. This can often be complicated by the fact that geological forces can cause faulting and tilting of rocks.
Absolute dating is used to determine a precise age of a rock or fossil through radiometric dating methods.
There are two main methods determining a fossils age, relative dating and absolute dating.
Relative dating is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages.
For years, creation researchers have published ample data to refute the assumed reliability of nuclear decay clocks in general, as well as specifically for Lead.
For example, in 1979, John Woodmorappe catalogued scores of discordant dates “determined” by isotope decay systems, all published in secular literature.
For example if you have a fossil trilobite and it was found in the Wheeler Formation.Even the solar system has been dated using one of these systems, by measuring the amount of a decaying element and comparing it to the amount of its stable (decayed) daughter material in meteorites.However, a recent analysis using state-of-the-art equipment found that a basic assumption underlying one of these clock systems needs to be re-evaluated.New data collected by secular researchers has confirmed what creation scientists discovered decades ago—geologists’ assumptions about radioactive decay are not always correct.
For a century, the radioactive decay of unstable elements into more stable ones has been used as a natural clock to estimate the age of earth materials.These discordant dates should not be evident if the assumption of rate constancy—which underlies radioisotope dating of igneous materials and is used to support the “billions of years” age for the solar system—is accurate.