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(shí)期。

2、In the 18th James Hutton opened up depths of geological time that dwarf the narrow now.
18世紀(jì)的詹姆斯·赫頓(James Hutton)開辟了地質(zhì)時(shí)代的深度，現(xiàn)在這個(gè)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(shí)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(shí)間不長。

5、Scientists are now debating whether it should be officially included in the Geological Time Scale.
科學(xué)家正討論是否應(yīng)正式把這個(gè)時(shí)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(shí)期。

7、Biochronology The measurement of geological time using biological events.
使用生物學(xué)事件來測量地質(zhì)學(xué)時(shí)間。