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Cambrian The earliest period of the Paleozoic era, about 590-510 million years ago. 寒武纪:地质年代古生代的第一个纪，在五亿九千万到五亿一千万前。
Of,belonging to,or designating the geologic time,system of rocks,and sedimentary deposits of the seventh and last period of the Paleozoic Era. 二叠纪的，二叠岩的是、属于或标明为古生代第七个和最后一个阶段的地质时期、岩层及沉积矿藏。
Cambrian: the beginning of the Paleozoic Era Animals with hard-shells appeared in great numbers for the first time during the Cambrian. 寒武纪：古生代的开始（距今5亿1,400万年前），具有硬壳的生物在寒武纪第一次大量出现。
Of, belonging to, or designating the geologic time, system of rocks, and sedimentary deposits of the seventh and last period of the Paleozoic Era. 二叠纪的，二叠岩的是、属于或标明为古生代第七个和最后一个阶段的地质时期、岩层及沉积矿藏
Of, relating to, or designating the geologic time, system of rocks, and sedimentary deposits of the second period of the Paleozoic Era, characterized by the appearance of primitive fishes. 奥陶纪（系）的属于、有关或指奥陶纪（系）的，奥陶纪（系）是指古生代第二纪的一段地质时间、岩石系统及沉积物，该纪以早期鱼的出现为特征
Of, belonging to, or being the geologic time, system of rocks, and sedimentary deposits of the first period of the Mesozoic Era, after the Permian Period of the Paleozoic Era and before the Jurassic Period of the Mesozoic Era. 三叠纪的，三叠系的，三叠纪岩石的属于或关于中生代的第一个时期的，这个时期岩石系的和沉积矿床的，在古生代的二叠纪元后，中生代的侏罗纪之前
Any of numerous extinct marine arthropods of the class Trilobita,of the Paleozoic Era,having a segmented body divided by grooves into three vertical lobes and found as fossils throughout the world. 三叶虫多种构成三叶虫纲任一种的已灭绝的海洋节肢动物，身体分节，有带沟将身体一分为三个垂直的叶，在世界各地都发现过其化石
Of,belonging to,or being the geologic time,system of rocks,and sedimentary deposits of the sixth period of the Paleozoic Era,characterized by the development of coal-bearing rock formations. 宾夕法尼亚纪的，宾夕法尼亚系的属于、有关或是古生代第六纪晚石炭纪指地质年代或岩石系中含煤岩层的形成发展期的。
Of,relating to,or belonging to the geologic time,system of rocks,and sedimentary deposits of the first period of the Paleozoic Era,characterized by warm seas and desert land areas. 寒武纪的寒武纪的、与之相关的或属于它的，即古新世时代第一时期的岩石体系的以及沉积物的，以海洋的温暖和陆地的荒漠为特征
Of,relating to,or designating the geologic time,system of rocks,and sedimentary deposits of the second period of the Paleozoic Era,characterized by the appearance of primitive fishes. 奥陶纪（系）的属于、有关或指奥陶纪（系）的，奥陶纪（系）是指古生代第二纪的一段地质时间、岩石系统及沉积物，该纪以早期鱼的出现为特征。
Any of numerous extinct marine arthropods of the class Trilobita, of the Paleozoic Era, having a segmented body divided by grooves into three vertical lobes and found as fossils throughout the world. 三叶虫多种构成三叶虫纲任一种的已灭绝的海洋节肢动物，身体分节，有带沟将身体一分为三个垂直的叶，在世界各地都发现过其化石
Of, belonging to, or being the geologic time, system of rocks, and sedimentary deposits of the fifth period of the Paleozoic Era, characterized by the submergence of extensive land areas under shallow seas. 密西西比的属于或处于古生代第五世的地质年代的、或该年代的岩石系统的或沉积物的，这一地质时代以大量陆地沉入浅海为特征
Of, belonging to, or being the geologic time, system of rocks, and sedimentary deposits of the sixth period of the Paleozoic Era, characterized by the development of coal-bearing rock formations. 宾夕法尼亚纪的，宾夕法尼亚系的属于、有关或是古生代第六纪晚石炭纪指地质年代或岩石系中含煤岩层的形成发展期的
Of, relating to, or belonging to the geologic time, system of rocks, and sedimentary deposits of the first period of the Paleozoic Era, characterized by warm seas and desert land areas. 寒武纪的寒武纪的、与之相关的或属于它的，即古新世时代第一时期的岩石体系的以及沉积物的，以海洋的温暖和陆地的荒漠为特征
Geological stratums from all eras, including the Pre-Cambrian period to the Paleozoic era, the Mesozoic era, and the Cenozoic era, are evenly distributed. 从年代角度看，从前寒武纪到古生代、中生代、新生代的所有地层均匀分布，岩石由各种火成岩、沉积岩及变质岩构成。
Characteristics of arc structure zones in the paleozoic era of Hainan island, and its geological implications 海南岛古生代弧状构造带的特征及其地质意义
"Carboniferous:Of, belonging to, or denoting a geologic division of the Paleozoic Era following the Devonian and preceding the Permian," 石炭纪的,石炭系的:(属于或表示)地质上的一个分段,即紧跟着泥盆纪而早于二叠纪的古生代的。
of,belonging to,or being the geologic time,system of rocks,and sedimentary deposits of the fifth period of the Paleozoic Era,characterized by the submergence of extensive land areas under shallow seas 属于或处于古生代第五世的地质年代的、或该年代的岩石系统的或沉积物的，这一地质时代以大量陆地沉入浅海为特征
of,belonging to,or being the geologic time,system of rocks,and sedimentary deposits of the first period of the Mesozoic Era,after the Permian Period of the Paleozoic Era and before the Jurassic Period of the Mesozoic Era 三叠纪的，三叠系的，三叠纪岩石的属于或关于中生代的第一个时期的，这个时期岩石系的和沉积矿床的，在古生代的二叠纪元后，中生代的侏罗纪之前
the Paleozoic era 古生代