When the biomarkers are detected in crude oil, it is identified that the age of possible source rock is predicated.
当原油中检出这些具时代意义的生物标志物时，可由此推测原油生源岩沉积的地质时代。The most common way of distinguishing periods of geological time is by means of the fossils they contain.
判断地质时代的最常用方法就是通过研究化石中所包含的信息。The changes in plankton over time are useful for estimation of relative ages of rocks that contain the fossilized remains of plankton.
在整个地质年代中，浮游生物随地质时代的变化用于估计含己成为化石的浮游生物残体的岩石的相对年代很有用。Looking back at FogBugz circa August 2006 (version 5. 0) feels a bit like examining the fossil record from a distant geological era.
回头看5.0版的FogBugz，大概是06年8月份推出的，就好像在审视遥远地质时代的化石。But have we really ushered in a new geological era, the so-called Anthropocene?
但是，我们真的迎来了一个新的地质时代，所谓的“人类世”吗？The vastness of geologic time and the slowness of geological processes are difficult to capture in a simple chart.
地质时代的浩瀚和地质作用的缓慢是难以在一幅简单的表格中表达的。And it has time continuity and irreplaceability in geological time.
在地质时代上具有时间的连续性和不可替代性How many geological periods are represented in your area? 5 points each, maximum 50 points.
在本公园内有多少个地质时代？每个5分，最大值为50分。Characters and geological age of conodont fauna from denominated section of Benxi Formation
本溪组命名剖面牙形刺动物群的特征及地质时代