Ordovician

1. The dry mountain ranges of the western United States contain rocks dating back 440 to 510 million years, to the Ordovician period, and teeming with evidence of tropical marine life.: 美国西部干燥的山脉包含了距今4.4亿至5.1亿年前的奥陶纪岩石，其中充斥着热带海洋生物生存的迹象。

2. The Cambrian-Ordovician boundary set between D.: 寒武系与奥陶系界线位于D。

3. Marine volcanics of Early Ordovician was found in Zhifang region.: 纸房地区具有早奥陶世海相火山岩存在。

4. This is a new type of Cambrian-Ordovician profile in Luxi area(west of Shandong).: 这是鲁西地区寒武—奥陶系剖面的一种新类型。

5. The main water source is fracture-karst water in Middle Ordovician carbonate rocks.: 主要的供水水源为中奥陶统碳酸盐类岩石中的裂隙-喀斯特水。

6. The Cambrian - Ordovician strata in Luxi Block are very continuous and well exposed.: 鲁西地块的寒武-奥陶纪地层出露连续，露头较好。

7. Ordovician carbonates of Tahe oilfield have been reformed by tectonic movements for many times.: 塔河油田奥陶系碳酸盐岩经历了多期构造运动的改造。

8. This is the first time in the study and mapping of the Middle and Late Ordovician in South China.: 这种定量的岩相古地理图在我国南方中及晚奥陶世还是首次出现。

9. There developed a vast area of weathering crust karst reservoirs on top Ordovician in Ordos Basin.: 鄂尔多斯盆地在奥陶系顶部发育大面积的风化壳岩溶储层。

10. The early Paleozoic strata can be pided into the Cambrian Hulan Group and the Ordovician Liaoyuan Group.: 吉林槽区的早古生代地层可分为寒武系呼兰群及奥陶系辽源群。

11. Vein fluorite and barite deposits in southeast Sichuan occur mainly in the Lower Ordovician carbonate rocks.: 川东南脉状萤石-重晶石矿床主要产于下奥陶统碳酸盐岩中。

12. This achievement provides the microfossil materials for the study of the lower ordovician in Northern Guizhou.: 这一成果对于贵州北部下奥陶统的研究，提供了微体化石资料。

13. Ordovician limestone water appearing in parts of Xiaoguanzhuang iron deposit relates with regional karst water.: 小官庄铁矿局部出现的奥灰水与区域岩溶水有水力联系。

14. A lot cephalopoda fossils were found in the section of dolomite with limestone, which belong to early Ordovician.: 于白云岩夹灰岩之层段发现大量的头足类化石，其时代属早奥陶世。

15. The Ordovician crude oil of Tahe oilfield is marine facies, but it does not contradict with high paraffin content.: 塔河油田奥陶系原油来源于海相烃源岩与原油具高蜡特征并不矛盾。

16. The Ordovician ice age happened 444 million years ago, and records have suggested that CO2 levels were relatively high then.: 奥陶纪冰河时期发生在4.44亿年前，有记录表明其CO2含量较高。

17. The North China type Cambrian and Early Ordovician strata can be subpided into 7 Formations, 21 biozones and 10 stages.: 河南省华北型寒武纪—早奥陶世地层可分为7个组、21个生物带、10个阶。

18. In the Ordovician, Silurian Period, the Devonian, Carboniferous, the advent of low amphibians and ancient ancient reptiles.: 在奥陶纪、志留纪、泥盆纪、石炭纪，相继出现低等鱼类、古两栖类和古爬行类动物。

19. However, some researchers believe that a GRB was responsible for the Ordovician mass extinction approximately 450 million years ago.: 然而，有一些研究者认为，大约4.5亿年前的奥陶纪大灭绝是伽马射线爆引起的。

20. These folded rocks are composed of medium to thick bedded limestone of Ordovician and of thin bedded shale and siltstone of Silurian.: 这些褶皱岩层是由奥陶系的中层至厚层石灰岩以及志留系的薄层页岩和粉砂岩组成。

21. Consequently, predicting distribution areas of Ordovician limestone karst flow for the evidences of finding water with hydrological drill.: 从而预测奥灰岩溶水的分布范围，为水文钻探找水提供依据。

22. Curiously, even though the end-Ordovician led to a huge loss of life, in a way it actually had very little impact on the persistence of lineages.: 奇怪的是，虽然这次大灭绝导致大量物种消失，但是在某种程度上，它其实对物种世系的维持影响甚微。

23. Except for huge carbonate rock lithologic deposit of Ordovician, the main hydrocarbon reservoir are all belong to tectonic hydrocarbon reservoir.: 主力油气藏中除了奥陶系大型碳酸盐岩岩性油藏之外，都属于构造型油气藏。

24. Carbon and Oxygen isotopic study of some representative Cambrian Ordovician boundary strata of various stratigraphic areas in East China has done.: 对我国东部不同地层区一些代表性的寒武系—奥陶系界线层位开展了碳、氧同位素研究。

25. Gucheng Ordovician reef beach facies lithostratigraphic trap zone and Luobupo Ordovician reef beach facies structure-lithostratigraphic trap zone.: 古城奥陶系礁滩相岩性圈闭带和罗布泊奥陶系礁滩相构造—岩性复合圈闭带。

26. Eurypterid: any of various large segmented aquatic arthropods of the order eurypterida that existed from the ordovician period to the Permian period.: (古生)板足鲎目的：一种巨大的、有节的，属于板足鲎目的水生节肢动物，生存于奥陶纪到二叠纪时期。

27. There were various trap types developed in the Middle Upper Ordovician, including sedimentary type, reef type and structure controlled sedimentary type.: 中上奥陶统圈闭发育多种类型，有成岩型圈闭、礁型圈闭和受构造作用控制的成岩型圈闭。

28. During the Ordovician, most life was in the sea, so it was sea creatures such as trilobites, brachiopods and graptolites that were drastically reduced in number.: 在奥陶纪，大多数生命都生活在海洋里，所以海洋生物，例如三叶虫、腕足类动物与笔石动物的数量在此时急剧减少。

29. The weathering crust of Majiagou Formation in Ordovician of Changqing Gasfield in Ordos Basin is the major pay zone with the evaporated marginal sea facies.: 鄂尔多斯盆地中部气田奥陶系马家沟组属蒸发边缘海相地层，其风化壳是中部气田的主要产气层段。

30. The third largest extinction in Earth's history, the Ordovician-Silurian mass extinction had two peak dying times separated by hundreds of thousands of years.: 作为地球史上消亡物种排行第三的大灭绝，奥陶系-志留纪大灭绝有两个死亡高峰期，其中相隔数十万年时间。

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