The moon

, Volume 13, Issue 1–3, pp 259–276 | Cite as

Cosmic ray exposure ages of features and events at the apollo landing sites

  • R. Arvidson
  • G. Crozaz
  • R. J. Drozd
  • C. M. Hohenberg
  • C. J. Morgan
Article

Abstract

Cosmic ray exposure ages of lunar samples have been used to date surface features related to impact cratering and downslope movement of material. Only when multiple samples related to a feature have the same rare gas exposure age, or when a single sample has the same81Kr-Kr and track exposure age can a feature be considered reliably dated. Because any single lunar sample is likely to have had a complex exposure history, assignment of ages to features based upon only one determination by any method should be avoided. Based on the above criteria, there are only five well-dated lunar features: Cone Crater (Apollo 14) 26 m.y., North Ray Crater (Apollo 16) 50 m.y., South Ray Crater (Apollo 16) 2 m.y., the emplacement of the Station 6 boulders (Apollo 17) 22 m.y., and the emplacement of the Station 7 boulder (Apollo 17) 28 m.y. Other features are tentatively dated or have limits set on their ages: Bench Crater (Apollo 12) ⩽99 m.y., Baby Ray Crater (Apollo 16) ⩽2 m.y., Shorty Crater (Apollo 17) ≈ 30 m.y., Camelot Crater (Apollo 17) ⩽140 m.y., the emplacement of the Station 2 boulder 1 (Apollo 17) 45–55 m.y., and the slide which generated the light mantle (Apollo 17) ⩾50 m.y.

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Copyright information

© D. Reidel Publishing Company 1975

Authors and Affiliations

  • R. Arvidson
    • 1
  • G. Crozaz
    • 1
  • R. J. Drozd
    • 1
  • C. M. Hohenberg
    • 1
  • C. J. Morgan
    • 1
  1. 1.McDonnell Center for Space SciencesWashington UniversitySt. LouisUSA

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