Abstract

THE Apollo 17 mission landed in a valley in the highland region forming part of the south-eastern rim of the Sea of Serenity (20° 09′ 50″ N, 30° 44′ 58″ E). An early allocation of a limited number of samples has been made to provide preliminary information on this site and we report here the results of age determinations we have made on two crystalline rocks using the 40Ar–39Ar and 38Ar–37Ar dating techniques1,2. The description of sample documentation and relationship of samples to the geology at the Apollo 17 site is based on a preliminary report (Astrogeology 71) issued by the Apollo Lunar Geology Investigation team and may be subject to modification. Sample classification is based on information supplied by the Preliminary Examination team at the Manned Spacecraft Center.

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