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.
第三，我们已经收集到有关始新世时代植物灭绝的地质证据。
And third, there is geological evidence for plant extinctions in the Eocene.
这两个“印支地槽”的主要褶皱时代是中、晚始新世之交，以勐腊群及其相当层位之下的区域性巨大不整合为标志。
The principal fold age of the two "Indosinian geosynclines" is between the Middle and Late Eocene, which is marked by the regional flagrant unconformity below the Mengla Group and equivalent horizons.
在南海北部陆架，这一孢粉组合可与WS1-3-1井流沙港组三段孢粉组合对比，时代为早始新世。
On the northern shelf of South China Sea, the latter assemblage can only be compared with the third member of Liushagang Formation in the WS1-3-1 well, Beibu Gulf Basin.
在南海北部陆架，这一孢粉组合可与WS1-3-1井流沙港组三段孢粉组合对比，时代为早始新世。
On the northern shelf of South China Sea, the latter assemblage can only be compared with the third member of Liushagang Formation in the WS1-3-1 well, Beibu Gulf Basin.
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