Because these mare lavas predate the highland debris layers, which were laid down during basin formation3.8 billion years ago, they indicate that the eruption of lava onto the moon began well before the ages of the oldest mare flows sampled by Apollo.

• 因为这些月海岩浆，比38亿年前盆地形成时产生的高地遗屑年代久远，它们显示月球上岩浆开始喷发的时间，远早于阿波罗所采集样本中最古老的月海岩流。