geological era

同根派生

Cainozoic) The present geological era, beginning some 65 million years ago, and divided into two periods, the Tertiary and the Quaternary.
这个时期的特点是出现了现代的生物体，特别是哺乳动物和有花植物。
County geological formation exposed by geological era, there are 7 lines (JI), the Sinian, Cambrian, Ordovician, Silurian, Cretaceous, Tertiary, Quaternary.
地质县境地层出露按地质年代，有7个系（纪），即震旦系、寒武系、奥陶系、志留系、白垩系、第三系、第四系。
It is above-reality because it covers a huge timespan, though not huge enough to exceed a geological era, for example, the current Fourth Glacial Period we’re in.
在当今世界，政治家之间的对话在气候变化问题上实现了新的穿越。
A stratigraphic unit, especially a unit consisting of two or more formations deposited during a single geologic era.
地层学单位:地层学中的一个单位,尤指包括在同一地质时期沉积的两个或两个以上地层的单位。
Study is made on palaeozoic conodont fossil from Bachu Uplift and Awati Depression. 5 conodont fossil assemblage zones are identified.And their geological history and geological eras are discussed.
对塔里木盆地西部巴楚断隆、阿瓦提凹陷古生代产出的牙形刺化石进行了研究，建立了5个牙形刺化石组合带，讨论了其地史分布及其地质时代。