DEATH FROM ABOVE DO BIG EXTINCTIONS COME LIKE CLOCKWORK - FROM SPACE?

SARAH SCOLES

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DEATH FROM ABOVE DO BIG EXTINCTIONS COME LIKE CLOCKWORK - FROM SPACE?

机译：上面的死亡大灭绝像时钟一样吗？来自空间吗？

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Back in 1977, geologist Walter Alvarez returned from a scientific expedition to Italy with a peculiar rock sample, liberated from limestone that was once underneath a long-gone ocean. The rock's older, bottom layers were full of fossils. But above them was a layer of clay that had none. That layer captured the aftermath of an event 66 million years ago, when something caused a mass extinction, slaying 75 percent of the species on the planet, including T. rex and triceratops.

机译：早在1977年，地质学家沃尔特·阿尔瓦雷斯（Walter Alvarez）从一次科学考察中返回了意大利，那里有一块奇特的岩石样品，它从曾经在漫长的海洋下面的石灰石中解放出来。岩石较旧的底层充满了化石。但是在它们上面是一层没有的粘土。该层捕获了6600万年前的事件的后果，当时某种原因导致了生物大灭绝，杀死了地球上75％的物种，包括霸王龙和三角龙。

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《Discover》 |2016年第7期|26-33|共8页
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SARAH SCOLES;
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DEATH FROM ABOVE DO BIG EXTINCTIONS COME LIKE CLOCKWORK - FROM SPACE?

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