1、a unit of geological time during which a system of rocks formed.
地質(zhì)上的分期，指巖石形成的時期。

2、In the 18th James Hutton opened up depths of geological time that dwarf the narrow now.
18世紀的詹姆斯·赫頓(James Hutton)開辟了地質(zhì)時代的深度，現(xiàn)在這個研究范圍已經(jīng)很窄了。

3、The cosmos operates for us very urgently, but geological time is different.
宇宙對我們施加的影響非常緊迫，但是地質(zhì)時間卻與眾不同。

4、On the geological time scale mankind has existed but for a brief moment.
人類在地質(zhì)年代表中已經(jīng)存在，但時間不長。

5、Scientists are now debating whether it should be officially included in the Geological Time Scale.
科學家正討論是否應正式把這個時期列入地質(zhì)年代表。

6、a unit of geological time during which a system of rocks formed
地質(zhì)上的分期，指巖石形成的時期。

7、Biochronology The measurement of geological time using biological events.
使用生物學事件來測量地質(zhì)學時間。