upper Triassic series

例句：

1. 1.The upper Triassic series is a key to understanding the evolution of life on Earth.
   上三叠纪地层系列是理解地球上生命演化的关键。
2. 2.The upper Triassic series contains fossils that can help us understand the environment during that time period.
   上三叠纪地层系列包含的化石可以帮助我们了解那个时期环境的情况。
3. 3. The upper Triassic series was discovered in the Yucatan Peninsula, Mexico.
   上三叠纪地层系列是在墨西哥尤卡坦半岛发现的。