... Paleogene coalfield 古近系煤田 Cretaceous-Paleogene boundary 白垩纪第三纪灭绝事件 Cretaceous-Paleogene extinction 白垩纪第三纪灭绝事件 ...
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It says lice are old, predate the Cretaceous-Paleogene boundary, and must have been living on something.
它说明了虱子的历史非常久,在白垩纪-早第三纪过渡期之前,而且也肯定是寄生在某种生物上的。
The mass extinction of terrestrial dinosaurs is the most important evolutionary event across the Cretaceous-Paleogene boundary.
陆生恐龙的绝灭是白垩系-古近系界线事件中最引人注目的。
“The fossil record continues to show that the origin of modern placental mammals postdates or is at the Cretaceous-Paleogene boundary, ” he said.
他说:“化石记录一再证实现代胎盘类哺乳动物的起源是在白垩纪-早第三纪分界点的时候或那之后。
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