Ancient ruins and artifacts only take us back a few thousand years, geologic records only about 2 million.

古代遗迹和手工制品只能带我们回到几千年前，地质记录也只能到约 200 万年前。

Ever since, Curiosity has been investigating the geologic record to understand when Mars might have been most suitable to host life.

从那以后，好奇号就一直在调查地质记录，以弄清火星何时最宜居。

If we use the geologic record, we can reconstruct where it went in the past.

如果我们使用地质记录，我们可以重建它过去的去向。

In the geologic record, buried organic carbon with no oxygen shows up as black shales.

在地质记录中，没有氧气的掩埋有机碳表现为黑色页岩。

But, what stands out in the geologic record is how sudden this cold snap was.

但是，在地质记录中突出的是这次寒流来得多么突然。

If we look into the past, about 56 million years ago, we find a moment a thin line in the geologic record where the course of life on earth was altered.

如果我们追溯到大约 5600 万年前，我们会发现某个时刻某地质记录中的某个细线，地球上的生命历程发生了变化。

In 2014, a team of researchers proposed that the slow rise in ocean oxygen levels that we find in the geologic record was due directly to sponges' feeding habits.

2014 年，一组研究人员提出，我们在地质记录中发现的海洋含氧量缓慢上升直接归因于海绵的摄食习惯。

A huge contingent of engineers and operations personnel were all hands on  deck, running analyses, forecasting weather, reviewing geologic records and original design  reports trying to decide the best course of action.

大批工程师和操作人员都在现场进行分析、预测天气、审查地质记录和原始设计报告，试图决定最佳行动方案。