形成这些沉积物的河流实际上离一个叫做特提斯海的古代海洋不远。
The river that formed these deposits was actually not far from an ancient ocean known as the Tethys Sea.
在湖泊沉积物中发现了古代花粉的遗迹，这表明，该地区曾经是温和的热带。
Ancient pollen found in the sediment in the lakes has shown that the area was once mildly tropical.
然而，由于地壳的变动，那些包含着古代动植物尸体的沉积物重新回到了地球表面，在那里他们分解，并又一次的从大气中吸取氧气。
As the crust shifts, however, it can bring sediments containing ancient corpses back to the surface, where they decompose, removing oxygen from the atmosphere once more.
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