This 65.5-million-year-old layer of Earth separates fossils of the Cretaceous period from those of the Tertiary period.

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。

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Weak cemented fine quicksand layer deposited at the Tertiary Period and Jurassic Period is widely distributed in China's northeast and southwest regions.

第三纪和晚侏罗纪时期沉积的弱胶结粉细砂层在我国东北、南地区有广泛的分布。

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Tertiary is the target layer for exploring in-situ leachable uranium deposit in Shebotu area, southwest Songliao Basin.

舍伯吐地区位于松辽盆地西南部，主要找矿目的层为第三系。

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The question is one of the most hotly contested in palaeontology and revolves around an apparent gap in the fossil record immediately prior to the K-T boundary - the distinct layer of geological sediments separating the Cretaceous and Tertiary periods, and associated with a massive asteroid impact and global extinction event.

BBC: Closing the 'three metre gap'