The Tertiary Period was separated into division of time that were equal in length.

第三纪被划分为等长的时间单位。

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Charles Lyell made a good estimate of the Tertiary Period from the fossil record, but his method could not be extended to earlier geological periods.

查尔斯·莱尔根据化石记录对第三纪作出了很好的估计，但他的方法不能扩展到更早的地质时期。

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The flora origin is not after the Tertiary Period.

起源时间不晚于第三纪或更早一些。

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Its detection at unearthly levels in rocks 65 million years old was the first evidence in the case for an asteroid causing the mass extinction and global environmental mayhem that ended the Cretaceous period and began the Tertiary period.

BBC: Leaving our mark: Fossils of the future

Enrolment in pre-primary, secondary and tertiary education has also grown by more than 60% during the same period.

UNESCO: EDUCATION