A study underway at Marshall Space Flight Center is further characterizing the effects of shock on isotopic ages . The study was inspired by the work of L. Nyquist et al . [ 1 , 2 ] , but goes beyond their work by investigating the spatial distribution of elements in lunar ferroan anorthosites ( FANs ) and magnesium - suite ( Mg - suite ) rocks in order to understand the processes that may influence the radioisotope ages obtained on early lunar samples . This paper discusses the first data set ( major elements ) obtained on FANs 62236 and 67075 .