植物化石赏析(28) 蚊母 树叶 - 植物专区 -... ... 学名:始新世蚊母树(Distylium eocenica) 时代:始新世(Eocene) 产地与地层:美国Utah,Bonanza,绿河组(Green River Formation) ...
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现在的问题是--如果遗传科研人员的论断正确无误,那么现存的哺乳动物群就不是起源于始新世时代了.
The trouble is that if the genetics researchers are right, these modern groups did not actually originate in the Eocene.
始新世时代为古新代的后一时期,它存在于距今五千六百万年以前;据称,就是在这个时期哺乳动物的祖先的进化该是趋于多样化的。
It was during the Eocene, which began 56m years ago, following the Palaeocene, that the ancestors of mammals around today are supposed to have diversified.
该植物孢粉的发现肯定了热鲁组上部地层的形成时代为始新世,亦表明其形成于干旱较热的气候环境。
The discovery indicates that the upper part of the Relu Formation was formed in dry and hot climate in the Eocene.
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