Science. 1983 Jan 14;219(4581):170-2. doi: 10.1126/science.219.4581.170.
Volcanic glasses collected on the rim of Shorty Crater in the Apollo 17 area were formed 3.63 x 10(9) years ago. The amounts of xenon-136 produced by neutron-induced fission of uranium-235 indicate that the glasses resided on the lunar surface for about 38 million years before they were deeply buried. The glass spherules were reexcavated by the impact that formed Shorty Crater 17 million years ago, and remained undisturbed until they were collected.
在阿波罗 17 地区的 Shorty 火山口边缘收集到的火山玻璃形成于 36.3 亿年前。由铀-235 中子诱发裂变产生的氙-136 的量表明，这些玻璃在被深埋之前，曾在月球表面停留了大约 3800 万年。这些玻璃珠球是在 1700 万年前形成 Shorty 火山口的那次撞击中重新被挖掘出来的，在此期间它们一直保持原状，直到被采集。
