The hills are remnants of an earlier geological era, scraped bare of most soil and exposed to the elements.
这些山丘是早期地质时代的遗迹，大部分土壤都被刮掉， 暴露在自然环境中。
| 单词 | Geological era |
| 释义 |
Geological era
原声例句
2018年英语六级阅读真题 The hills are remnants of an earlier geological era, scraped bare of most soil and exposed to the elements. 这些山丘是早期地质时代的遗迹，大部分土壤都被刮掉， 暴露在自然环境中。 穿越星际秘境 These different layers likely represented different geological eras, which would give scientists the clearest picture of the history of Jezero, as well as giving them an opportunity to find life itself. 这些不同的地层可能代表不同的地质时代，这将使科学家能够最清晰地了解杰泽罗的历史，并给他们一个发现生命本身的机会。
中文百科
代 (地质学) Era (geology)（重定向自Geological era）
代是一个细分的地质时间，将宙划分成更小的时间单位。显生宙分为三个时间阶段：古生代、中生代和新生代，在宏观化石代表了主要的阶段。灾难性灭绝事件作为这些代的界线，P-T界线作为古生代和中生代的分界，K-T界线作为中生代和新生代的分解。有证据表明在划定的时代之间的差异上，灾难性的陨石撞击发挥了重要作用。 冥古宙、太古宙和元古宙时期被作为一个整体以前称为前寒武纪。这个时期覆盖了地球上硬壳动物出现前的四十亿年历史。然而，最近这些宙被详细细分为代。
英语百科
Era (geology) 代 (地质学)（重定向自Geological era）
A geologic era is a subdivision of geologic time that divides an eon into smaller units of time. The Phanerozoic Eon is divided into three such time frames: the Paleozoic, Mesozoic, and Cenozoic represent the major stages in the macroscopic fossil record. These eras are separated by catastrophic extinction boundaries, the P-T boundary between the Paleozoic and the Mesozoic and the K-T boundary between the Mesozoic and the Cenozoic. There is evidence that catastrophic meteorite impacts played a role in demarcating the differences between the eras. |
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