Word: fragment
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Dates: during 1970-1979
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...apparent age of the moon itself -most of the rocks were about 1 billion years younger. How could there be such a huge age gap between material picked up only a few feet apart? "This is a major puzzle," says Rice University Geologist Dieter Heymann. One small rock fragment, though, was considerably older than the others: 4.44 billion years. Caltech Geologist G. J. Wasserburg, who calculated its age, believes that still older rocks dating back to the very creation of the moon will probably be found in the unexplored lunar highlands...
Most meteors are reduced to dust by atmospheric friction, so any substantial surviving fragment is valuable...