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    Define absolute relative dating

    This document is partly based on a prior posting composed in reply to Ted Holden.My thanks to both him and other critics for motivating me.Geochronologists do not claim that radiometric dating is foolproof (no scientific method is), but it does work reliably for most samples.

    In the last 200 or more years of their application, they are valid, but geologists do not assume they are.

    This orientation is not an assumption, because in virtually all situations, it is also possible to determine the original "way up" in the stratigraphic succession from "way up indicators".

    For example, wave ripples have their pointed crests on the "up" side, and more rounded troughs on the "down" side.

    The simplest situation for a geologist is a "layer cake" succession of sedimentary or extrusive igneous rock units arranged in nearly horizontal layers.

    In such a situation, the "principle of superposition" is easily applied, and the strata towards the bottom are older, those towards the top are younger.

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