One of the ideas is scorpions came out of the water from Silurian period long time ago.

——其中一个想法是蝎子很久以前从志留时期就从水中出现。

Most of these are also reasonably well known, Cretaceous, Jurassic, Triassic, Silurian, and so on.

其中大多数也是相当知名的, 白亜, 侏罗, 三叠, 志留等等。

We were passing through rocks of the transition or silurian [l] system.

我们正在穿过过渡或志留[l]的岩石。

While fish with jaws first appeared in the Silurian, they proliferated in the Devonian.

虽然有颚的鱼最早出现在 志留，但它们在泥盆大量繁殖。

It could not be otherwise, for in the Silurian age the seas contained at least fifteen hundred vegetable and animal species.

不可能不是这样， 因为在志留时代， 海洋中至少含有一千五百种植物和动物。

The culprit was an apex predator that dominated the seas of the late Silurian and early Devonian: the sea scorpion.

罪魁祸首是一种顶级捕食者，它在志留晚期和泥盆早期的海洋中占主导地位：海蝎子。

This twofold impact known as the Ordovician-Silurian Extinction, wiped out about 25% of all taxonomic families, including about half of trilobite families.

这种被称为奥陶-志留绝的双重影响大约 25% 的所有分类科，包括大约一半的三叶虫科。

The fish fossils were discovered at two sites in Chongqing and Guizhou, whose strata date back to the Silurian Period that began around 440 million years ago.

这些古鱼化石是在我国重庆、贵州等地志留早期距今约 4.4 亿年的地层中发现的。

Adam Sedgwick of Cambridge claimed for the Cambrian period a layer of rock that Roderick Murchison believed belonged rightly to the Silurian.

剑桥大学的亚当·塞奇威克 (Adam Sedgwick) 声称, 寒武时期的一层岩石, 罗德里克·默奇森 (Roderick Murchison) 认为属于志留。

It's one of the earliest known fungi in the fossil record, dating back 440 million years, to the early Silurian Period.

它是化石记录中已知最早的真菌之一，可追溯到 4.4 亿年前的志留早期。

These events happened at least  15 times throughout the Silurian, and we're still not actually sure why.

这些事件在整个志留期间至少发生 15 次，但我们仍然不确定其中的原因。

And, most of all, they show us how unpredictable  the Silurian period really could be.

最重要的是，它们向我们展示志留时期到底是多么难以预测。

But that picture of the Silurian  could not have been more wrong.

但那张志留的照片大错特错。

So armored fish came in a variety of shapes and sizes during the Silurian and Devonian, from tiny Heterostracans to massive Placoderms.

因此，在志留和泥盆期间， 装甲鱼的形状和大小各不相同，从微小的异类鱼到巨大的盾皮鱼。

Though only a few centimeters long, these graptolites would help unlock much  bigger secrets of the Silurian period.

虽然只有几厘米长，但这些笔石将有助于解开志留时期更大的秘密。

The period that came next, the Silurian, saw the evolution of armor in many groups of fish, all around the same time.

接下来的时期， 即志留，见证许多鱼群的盔甲进化，几乎是在同一时间。

This is because scale trees were a type of plant called lycopods, which originated way back in the Silurian Period -- before seeds were even a thing!

这是因为鳞片树是一种叫做石松的植物，起源于志留时期——甚至在种子出现之前！

Scientists imagine that these booms would have made graptolites the equivalent  of krill during the Silurian.

科学家们认为，这些繁荣将使笔石相当于志留时期的磷虾。

By the Silurian Period, a genus called Sphooceras tried a different tactic: Instead of coiling its shell, it broke off the end of it.

到志留时期， 一种名为 Spooceras 的属尝试一种不同的策略：它没有将外壳卷起来，而是折断外壳的末端。

Considering the consequences of these extinctions, it seems unbelievable that we once  thought the Silurian was so peaceful.

考虑到这些绝的后果，我们曾经认为志留如此和平似乎令人难以置信。