Rubidium-Strontium and Potassium-Argon Age of Lunar Sample 15555

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Science  28 Jan 1972:
Vol. 175, Issue 4020, pp. 419-421
DOI: 10.1126/science.175.4020.419


The lunar mare basalt 15555 from the edge of Hadley Rille has been dated at 3.3x109 years by both rubidium-strontium and potassium-argon techniques. Age and trace element abundances closely resemble those of the Apollo 12 mare basalts. Data from lunar basalts obtained thus far indicate that they cannot be derived by simple fractionation from a homogeneous source.