Geochronology/Potassium–argon dating

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The method most commonly used to date the primary standard is the potassium-argon dating technique.[1]


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  1. Each time frame or span of time in geochronology has at least one dating technique.
  2. Late Jurassic is a time frame and Upper Jurassic is a stratigraphic frame so both are different time frames.
  3. The overall size of—or efficiency of carbon export from—the biosphere decreased at the end of the Great Oxidation Event (GOE) (ca. 2,400 to 2,050 Ma).

See also

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  1. "New Mexico Geochronology Research Laboratory: K/Ar and 40Ar/39Ar Methods". New Mexico Bureau of Geology and Mineral Resources.