Section outline

  • General

    Collapse all Expand all

  • 生命和地质时间尺度

    Visual representation of the geologic time scale with life forms and periods outlined.

     

    Does this look more like geologic time?
    ::这更像是地质时间吗?

    This image gives some sense of what life forms appeared when. Take a good look. It's pretty amazing!
    ::这个图象能让人体会到生命形式在何时出现。 请仔细看看。它非常惊人!

    Life and the Geologic Time Scale
    ::生命和地理时间尺度

    The   may include illustrations of how life on Earth has changed. Major events on Earth may also be shown. These include the formation of the major  mountains  or the extinction of the dinosaurs. The figure above is a different kind of the geologic time scale. It shows how Earth’s environment and life forms have changed.
    ::可能包括地球生命如何变化的插图。 地球上的重大事件也可以被显示。 其中包括主要山峰的形成或恐龙的灭绝。 上图是另一种不同的地质时间尺度。 它显示了地球的环境和生命形式是如何变化的。

    Your Place in Geologic Time
    ::您在地理时间的位置

    We now live in the  Phanerozoic Eon , the  Cenozoic Era , the Quarternary Period, and the Holocene Epoch.  Phanerozoic  means visible life. During this eon,   contain visible  fossils . Before the Phanerozoic, life was microscopic. The Cenozoic Era means new life. It encompasses the most recent forms of life on Earth. The Cenozoic is sometimes called the Age of Mammals. Before the Cenozoic came the Mesozoic and Paleozoic. The Mesozoic means middle life. This is the age of reptiles, when dinosaurs ruled the  planet . The Paleozoic is old life. Organisms like  invertebrates  and fish were the most common lifeforms.
    ::我们现在生活在Phanerozoic Eon、Cenozoic Era、Cenozoic Era、季度、Holcene Epoch、Phanerozoic 中,代表着可见的生活。在这个Eon, 含有可见的化石。 在Phanerozoic之前, 生命是微观的。 Cenozoic Era是新的生命。 它包含着地球上最新的生命形式。 Cenozoic有时被称为Mammals时代。 在Cenozoic来到Mesozoic和Paleozoic之前, 它被称为Mesozoic和Paleozoic。 Mesozoic 意味着中生。 这是爬行动物时代, 当恐龙统治这个星球的时候。 Paleozoic是老生的。 Paleozoic是无脊椎生物。 像无脊椎动物和鱼类这样的有机体是最常见的生命形式。

    The Quaternary Period is the time since the beginning of the  ice ages . The  climate  has been cooler than it was earlier in the Cenozoic. Since the end of the Pleistocene ice ages, which are probably not entirely over, we have been in the Holocene Epoch. The Holocene is also called the Recent.
    ::冰河时期是冰河时期开始以来的时期。 气候比前些年更冷却。 自从冰河冰河时代结束以来,我们一直在冰河中。 冰河中也被称为“最新 ” 。

    Summary
    ::摘要

    • Complex life forms evolved relatively late in geologic time.
      ::复杂的生命形式在地质时代演变较晚。
    • The Holocene is a teeny part of Earth history. Humans evolved very recently.
      ::环球是地球历史上一个很小的部分。人类最近才进化。
    • The last 540 million years has seen an incredible amount of biodiversity.
      ::在过去的5.4亿年中,生物多样性达到了令人难以置信的地步。

    Review
    ::回顾

    1. Why do we not know exactly when life first evolved on Earth?
      ::为什么我们不知道生命是何时在地球上首次演变的呢?
    1. When did life become abundant?
      ::生命什么时候变得丰富了?
    1. Where do humans appear in this graphic? Is that where you would expect them to be?
      ::人类在这张图中在哪里出现?你期望他们在那里出现吗?