| 1. | It depends on the identification of zone fossils .
它依赖于分带化石的鉴别。 |
| 2. | Igneous rocks do not contain fossils .
火成岩不含化石。 |
| 3. | In these respects, the fossils resemble modern humans .
在这些方面，这些化石类似于现代人类。 |
| 4. | The search for fossil man then shifted to eastern africa .
对化石人的探索工作转移到了非洲东部。 |
| 5. | The rocks themselves bear another kind of evidence--the fossils .
岩石本身还拥有另一种证据化石。 |
| 6. | 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。 |
| 7. | 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。 |
| 8. | 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。 |
| 9. | Sedimentary rocks are thus tagged by the fossils which they contain .
沉积岩就这样以它们所含的化石作为鉴别的标记。 |
| 10. | Two others of these trilobite fossils have been found in the same area .
在同一地区还发现了另外两块这些三叶虫化石。 |
