By the early 1980s, it was obvious that the SNC group of meteorites (Shergottites, Nakhlites, Chassignites) were significantly different from most other meteorite types.
在1980年代早期，已經知道SNC（Shergottites, Nakhlites, Chassignites）隕石集團與大多數其他類型的隕石有著很明顯的不同。