Paleocene The oldest epoch of the Tertiary, 65 - 55 million yesrs ago.

古新世:第三纪最古的年代, 6500万～5500万年前.

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No creditable macrofossil record of the Fagaceae exists in the Cretaceous equivocal and require further study.

白垩纪尚无壳斗科可靠的大化石记录,微化石需要进一步研究才能确定亲缘关系以及古新世壳斗科已经分化出两个类群.

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Reflect its environment is turn the weak oxidation and reduction environment into hot dry oxidation environment.

反映其沉积环境由古新世至始新世早期弱还原与弱氧化交替环境转化成了干旱炎热的氧化环境.

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