microfossil

No creditable macrofossil record of the Fagaceae exists in the Cretaceous deposits and all the Cretaceous microfossil reports remain equivocal and require further study.

白垩纪尚无壳斗科靠的大化石记录，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。

In the summer of 2003 we began to zero in on one microfossil type whose complex morphological characteristics particularly intrigued us.

2003年夏天，我瞄准一种微化石的类型，其复杂的形态特徵特别引起我兴趣。