Dating rocks using radioactive isotopes is called

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The site also must be geologically meaningful, clearly related to fossil-bearing rocks or other features that need a good date to join the big story.

The mineral sanidine, the high-temperature form of potassium feldspar, is the most desirable.

But micas, plagioclase, hornblende, clays and other minerals can yield good data, as can whole-rock analyses.

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