Most sedimentary rocks are readily dated by radiometric methods.

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Most sedimentary rocks do not directly provide radiometric dates because they form from the accumulation of sediment particles derived from pre-existing rocks, which may have formed millions or billions of years earlier. Radiometric dating of sedimentary rocks is therefore difficult and relies on dating the minerals within the sedimentary rock, which can be challenging as they have often undergone secondary alterations, making them unsuitable for dating. As a result, sedimentary rocks are more commonly dated through relative dating methods, such as stratigraphy and fossil correlation.

Most Sedimentary Rocks Are Readily Dated by Radiometric Methods