I have a Milk Chocolate Dinosaur Egg, studded with mini chocolate dinosaurs and ammonites.

我有的是牛奶巧克力恐龙蛋，上面点缀着迷你巧克力恐龙和鹦鹉螺化石。

All the ammonites vanished, but their cousins the nautiloids, who lived similar lifestyles, swam on.

菊石统统消失了，但它们的表亲鹦鹉螺目软体动物却存活下来，尽管它们有着相似的生活方式。

This is a fossilized ammonite, and it's at least tens of millions of years old, and it's still iridescent.

这是一个菊石化石，它至少有几千万年的历史了，而且它仍然是彩虹色的。

Often, they'd find the remains of shellfish-like animals like ammonites and bullet-shaped belemnites.

通常，他们会发现菊石和子弹形箭石等贝类动物的遗骸。

Specifically a Mamites Ammonite from the Cretaceous Age.

一只白垩纪的马密特斯菊石。

Unlike dinosaur bones or ammonite shells the  squishier worms did not fossilize easily.

与恐龙骨头或菊石壳不同，较软的蠕虫不容易形成化石。

And the shallow oceans were where the ammonites were living.

浅海是菊石生活的地方。

But in the Devonian, a new branch of the cephalopod family tree appeared: ammonites.

但在泥盆纪，出现了头足类 家族树的一个新分支：菊石。

It spelled the end to 300 million years of ammonite evolution.

这标志着菊石3亿年演化的终结。

So we have this beautiful ammonite which is preserved in limestone and the individual spikes on this ammonite are preserved.

因此，我们有这种美丽的菊石，它保存在石灰岩中，并且这种菊石上的单个尖峰也被保留下来。

The morphology of ammonite shells is almost identical.

菊石壳的形态几乎相同。

Most ammonites went extinct about 66 million years ago, about the same time as the dinosaurs went extinct.

大多数菊石在大约6600万年前灭绝，与恐龙灭绝的时间大致相同。

All cephalopods have siphons, and it's likely some ammonites used theirs to swim at great speed.

所有头足类动物都有虹吸管，有些菊石很可能用虹吸管来快速游泳。

This hit baby ammonites, which relied on their thin, fragile shells to passively float near the ocean surface, especially hard.

这打击了小菊石，它们依靠薄而脆弱的壳被动地漂浮在海面附近，特别坚硬。

A different modern cephalopod shows us how ammonites swam.

一种不同的现代头足类动物向我们展示了菊石是如何游泳的。

So with the ammonites gone, when conditions improved, the coleoids rose up and took their place.

因此，随着菊石的消失，当条件改善时，莰石上升并取而代之。

At first, he thought it was an ammonite -- one of the ancient relatives of today's nautilus.

起初，他以为那是菊石——今天的鹦鹉螺的远古亲戚之一。

Or it could have used them to grip hard-bodied creatures like ammonites and basically shuck them out of their shells.

或者它可以用它们来抓住像菊石这样的硬体生物，基本上把它们从壳里剥出来。

Locals have even found fossils of so many ammonites that they've embedded them in the walls of their buildings as decorations.

当地人甚至发现了如此多的菊石化石，以至于他们将它们嵌入建筑物的墙壁中作为装饰品。

We're quite lucky, in that ammonites belong to the large group of mollusks called the cephalopods.

我们很幸运，因为菊石属于被称为头足类的一大类软体动物。