她说有两层显示了这种联系，一层有大约3万年历史，另一层3万5千年。
She says there are two layers showing the association, one about 30,000 years old, the other 35,000 years old.
这个有着6550万年历史的地层分离了白垩纪的化石和第三纪的化石。
This 65.5-million-year-old layer of Earth separates fossils of the Cretaceous period from those of the Tertiary period.
有着2200万年历史的Mush植物群会和Chilga 植物群本质相同吗？
Will the 22-million-year-old Mush flora be essentially the same as Chilga floras?
这个脚印来自两组化石脚印中的其中一组，最近在肯尼亚一些有150万年历史的石头上被发现。
THIS footprint is part of one of two series of fossil tracks found recently in Kenya in rocks that are 1.5m years old.
专家们说证据来自于一个有4万年历史的人类趾骨化石，这个纤细的趾骨化石是惯常穿鞋的象征。
The evidence comes from a 40, 000-year-old human fossil with delicate toe bones indicative of habitual shoe-wearing, experts say.
我们已经研究了有2700万到2800万年历史的化石，它们来自亚的斯亚贝巴西北一个叫Chilga的地区。
Already we have studied fossils that are 27 million to 28 million years old and come from a region called Chilga that is to the northwest of Addis Ababa.
这块有着4700万年历史的化石之所以被称为是人与猿之间缺失的环节，是因为它的大拇指与其他手指相对，并且具有了手指甲。
The 47 million-year-old fossil is the missing link between man and ape as the creature had opposable thumbs, and fingernails.
这具已经有320万年历史的娇小的原始人体骨架被人们称为Lucy，她是目前为止被发现的最为完整且名声最大的人类祖先之一。
The petite 3.2-million-year-old skeleton called Lucy is one of the most famous and most complete of human ancestors.
这具已经有320万年历史的娇小的原始人体骨架被人们称为Lucy，她是目前为止被发现的最为完整且名声最大的人类祖先之一。
The petite 3.2-million-year-old skeleton called Lucy is one of the most famous and most complete of human ancestors.
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