Two years ago the first scientific investigations of returned lunar samples were reported at the Apollo 11 Lunar Conference (1). Samples from the first mission to the moon had been in the hands of investigators for 3 or less, and the picture of the moon that emerged at that time was necessarily restricted in scope. We that Tranquillity Base is underlain basaltic rock that erupted onto mare surface 3.7 X 10^9 years ago, that is generally similar to terrestrial but with important differences: and other refractory are enhanced in abundance, and other volatile elements are , and the water content and potential o!f the lunar basalt are orders of magnitude lower those of analogous terrestrial lavas. existence of other types of rock the moon was only glimpsed, and structure and evolution of the moon a mystery.
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A 1972 study studied this question.