| 单词 | 志留纪 |
| 释义 | 〔Paleozoic〕Of, belonging to, or designating the era of geologic time that includes the Cambrian, Ordovician, Silurian, Devonian, Mississippian, Pennsylvanian, and Permian periods and is characterized by the appearance of marine invertebrates, primitive fishes, land plants, and primitive reptiles. See table at geologic time 古生代的：地质时代的一个时期的，属于这个时期的或这么称呼的，包括寒武纪、奥陶纪、志留纪、泥盆纪、密西西比纪、宾夕法尼亚纪和二叠纪时期，并且以海洋无脊椎动物、原始鱼类、陆地植物和早期爬行动物的出现为特征 参见 geologic time〔Silurian〕From Silures [so called because the Silures lived in the part of Wales where the rocks were first identified] 源自 Silures [这个名字是从居住在威尔士部分地区的志留人而来，因志留纪岩石在该地区首先被发现] 〔Silurian〕The Silurian Period or its system of deposits.志留纪，志留纪岩石：志留纪这段时间或志留纪沉积物〔graptolite〕Any of numerous extinct colonial marine animals chiefly of the orders Dendroidea and Graptoloidea of the late Cambrian to the early Mississippian periods, whose fossil remains are often used to date the rocks of the Silurian and Ordovician ages.笔石动物：许多已绝灭的殖民地海洋生物中的任何一种，主要为寒武纪晚期到密西西比纪早期的树形笔石目及笔石纲的生物， 其化石残存物常用于确定志留纪和奥陶纪岩石的年代 |
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