Silurian

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But as the ecosystem recovered after the freeze, it expanded, with land plants becoming common over the course of the Silurian period.
但在冰封之后，随着生态系统的复原，其范围也随之扩大，其结果是在Silurian期陆生植物变得更为普遍。
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。
The earliest of the Big Five, the end-Ordovician or Ordovician-Silurian extinction events some 444 million years ago, are reckoned by many to be the second largest.
五次大灭绝中发生最早的一次是奥陶纪末期或者奥陶纪-志留纪大灭绝事件，发生在大约4亿4千4百万年前。许多科学家估计这次规模是五次当中第二大的。

from or referring to the period of time between about 445 and 420 million years ago, in which fish with jaws (= mouth bones) and some plants and small animals on land first appeared

of, denoting, or formed in the third period of the Palaeozoic era, between the Ordovician and Devonian periods, which lasted for 25 million years, during which fishes first appeared 2500
the Silurian period or rock system

志留系
The Silurian was mainly medium sand, fine sand, siltstone and pelitic siltstone in shallow sea.
志留系沉积以滨浅海的中细砂岩、粉砂岩及泥质粉砂岩为主。
志留纪

志留系
Acidizing treatments in TaZhong(TZ)12 Silurian sandstone formation had achieved little effect and should be improved for inadequate understanding on the damage and inappropriate acid system.
塔中(TZ)12油田志留系砂岩储层在以往酸化改造现场实践中，由于对储层伤害认识不够深入，酸液类型和配方针对性不强，酸化有效率和增产率有待进一步提高。
志留纪