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By measuring the proportion of different isotopes present, researchers can figure out how old the material is. Spore-bearing land plants like ferns were always found before the occurrence of flowering plants. Lubenow, M. Thus all of our scenarios for producing spurious parent-to-daughter ratios can be extended to yield spurious isochrons.
In time order. How do these dates compare to the then current geological time scale? This rising body of magma is an open system with respect to the surrounding crustal rocks. Although more than one rock type can be generated from a single magma, apparently other mechanisms also exist to generate magmas of quite varied chemical compositions. Which only puts geological events in your own words, and radiometric dating methods.