| 1. | It depends on the identification of zone fossils .
它依赖于分带化石的鉴别。 |
| 2. | Scientists have dated the fossils by their bone structure .
科学家根据那些化石的骨骼结构确定其年代。 |
| 3. | At this distance of time it is difficult to date the fossil .
时间隔得这么久了，很难确定这化石的年代。 |
| 4. | Tow factors are favorable for the preservation of organisms as fossils .
有两个因素对生物化石的保存是有利的。 |
| 5. | The age equivalence of fossils found in the sandstone and the shale is thus demonstrated .
发现于砂岩和页岩中化石的等时性就这样得到证明了。 |
| 6. | Now and then he would turn over a likely-looking flint with the end of his ashplant .
有时他停下来用木棍尖端翻过一块看上去像是化石的石头看看。 |
| 7. | Archaeologists were unable to date the fossils
考古学家无法确定化石的日期。 |
| 8. | Finally , integrative correlation has been made
最后进行了各类化石的综合对比研究。 |
| 9. | The topic recently was the framework of dinosaur fossils
最近的论题是恐龙化石的结构。 |
| 10. | Through the discovery of fossils , what else you know
通过对这些化石的研究，你又了解到哪些信息？ |
