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 divided 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。
1·This paper introduces both methods of seismic attribute and pattern recognition and their application to predict Ordovician limestone karst fractured zones in Xuchang Coal Mine.
简单介绍了地震属性技术和模式识别方法及其在许厂煤矿奥陶系灰岩裂隙发育带预测中的具体应用。
2·Water filling sources of underground mine in Pingshuo mining area have Quaternary pore water, surface water, Permo-Carboniferous sandstone fissure water and Ordovician limestone karstic fissure water.
平朔矿区井工矿井的充水水源有第四系孔隙水及地表水、石炭—二叠系砂岩裂隙水、奥陶系灰岩岩溶裂隙水。
3·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。
4·The principal compositions of soluble materials of the Ordovician oil field water in Tahe oilfield are consistent with sea water, suggesting its Marine origin.
塔河油田奥陶系油田水的可溶物质主要成分与海水一致，表明其主要为海相成因。
5·The stratigraphic division and correlation of the Ordovician in the two districts have long been an outstanding problem.
两个分区奥陶系的划分和对比，是一个长期未决的问题。
1·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。
2·The natural geography of the Ordovician period is that: the Hannan paleocontinent and the Bashan Mountain rise at the north, and the wide epicontinental sea basin lies in the south.
奥陶纪时期，本区处于北为汉南古陆与巴山隆起，南为广阔的陆表海盆地的古地理环境。
3·In 1992, the author found fossil crinoid stems in crystalline limestone at Xia-zhuang, Wenchuan, which were determined to be of Ordovician age.
笔者1992年在汶川下庄的结晶灰岩中采到了海百合茎化石，证实其时代属奥陶纪。
4·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。
5·It was an important evolution and marked the end of transgression and regression cycle of the Cambrian and Ordovician in Tarim area.
这标志着塔里木地区寒武纪和奥陶纪海进海退旋回的终结。